How to force Ubuntu to detect external display?












15















My laptop recognises external display devices if I connect them before booting the system, but many times it doesn't if I connect while the system is running. In this case, rebooting naturally solves the problem.



Is there a way to force Ubuntu to detect external displays? Opening up the display menu and pressing "Detect displays" does nothing.






display







share|improve this question


















  • 1





    Video card and driver in use?

    – dadexix86
    Dec 8 '15 at 17:19











  • From lshw -c video: it's Haswell-ULT Integrated Graphics Controller and the driver is i915.

    – aasitus
    Dec 8 '15 at 17:53













  • Try logging out, going to a VC (ctrl-alt-F1) and restarting X (askubuntu.com/a/79587/16395). Sometime it works. Without logging out --- I never managed it.

    – Rmano
    Dec 8 '15 at 21:13











  • Thanks. I was hoping there'd be a way to do that without logging out.

    – aasitus
    Dec 10 '15 at 19:41
















15















My laptop recognises external display devices if I connect them before booting the system, but many times it doesn't if I connect while the system is running. In this case, rebooting naturally solves the problem.



Is there a way to force Ubuntu to detect external displays? Opening up the display menu and pressing "Detect displays" does nothing.






display







share|improve this question


















  • 1





    Video card and driver in use?

    – dadexix86
    Dec 8 '15 at 17:19











  • From lshw -c video: it's Haswell-ULT Integrated Graphics Controller and the driver is i915.

    – aasitus
    Dec 8 '15 at 17:53













  • Try logging out, going to a VC (ctrl-alt-F1) and restarting X (askubuntu.com/a/79587/16395). Sometime it works. Without logging out --- I never managed it.

    – Rmano
    Dec 8 '15 at 21:13











  • Thanks. I was hoping there'd be a way to do that without logging out.

    – aasitus
    Dec 10 '15 at 19:41














15












15








15


1






My laptop recognises external display devices if I connect them before booting the system, but many times it doesn't if I connect while the system is running. In this case, rebooting naturally solves the problem.



Is there a way to force Ubuntu to detect external displays? Opening up the display menu and pressing "Detect displays" does nothing.






display







share|improve this question














My laptop recognises external display devices if I connect them before booting the system, but many times it doesn't if I connect while the system is running. In this case, rebooting naturally solves the problem.



Is there a way to force Ubuntu to detect external displays? Opening up the display menu and pressing "Detect displays" does nothing.






display




display






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Dec 8 '15 at 17:17









aasitusaasitus

76113




76113








  • 1





    Video card and driver in use?

    – dadexix86
    Dec 8 '15 at 17:19











  • From lshw -c video: it's Haswell-ULT Integrated Graphics Controller and the driver is i915.

    – aasitus
    Dec 8 '15 at 17:53













  • Try logging out, going to a VC (ctrl-alt-F1) and restarting X (askubuntu.com/a/79587/16395). Sometime it works. Without logging out --- I never managed it.

    – Rmano
    Dec 8 '15 at 21:13











  • Thanks. I was hoping there'd be a way to do that without logging out.

    – aasitus
    Dec 10 '15 at 19:41














  • 1





    Video card and driver in use?

    – dadexix86
    Dec 8 '15 at 17:19











  • From lshw -c video: it's Haswell-ULT Integrated Graphics Controller and the driver is i915.

    – aasitus
    Dec 8 '15 at 17:53













  • Try logging out, going to a VC (ctrl-alt-F1) and restarting X (askubuntu.com/a/79587/16395). Sometime it works. Without logging out --- I never managed it.

    – Rmano
    Dec 8 '15 at 21:13











  • Thanks. I was hoping there'd be a way to do that without logging out.

    – aasitus
    Dec 10 '15 at 19:41








1




1





Video card and driver in use?

– dadexix86
Dec 8 '15 at 17:19





Video card and driver in use?

– dadexix86
Dec 8 '15 at 17:19













From lshw -c video: it's Haswell-ULT Integrated Graphics Controller and the driver is i915.

– aasitus
Dec 8 '15 at 17:53







From lshw -c video: it's Haswell-ULT Integrated Graphics Controller and the driver is i915.

– aasitus
Dec 8 '15 at 17:53















Try logging out, going to a VC (ctrl-alt-F1) and restarting X (askubuntu.com/a/79587/16395). Sometime it works. Without logging out --- I never managed it.

– Rmano
Dec 8 '15 at 21:13





Try logging out, going to a VC (ctrl-alt-F1) and restarting X (askubuntu.com/a/79587/16395). Sometime it works. Without logging out --- I never managed it.

– Rmano
Dec 8 '15 at 21:13













Thanks. I was hoping there'd be a way to do that without logging out.

– aasitus
Dec 10 '15 at 19:41





Thanks. I was hoping there'd be a way to do that without logging out.

– aasitus
Dec 10 '15 at 19:41










4 Answers
4






active

oldest

votes


















15














Actually, you don't need to log out. Simply going to a VC with ctrl-alt-f1 and going back to your graphical interface (ctrl-alt-f7) solves the problem for me.



This way, you don't lose all your windows...






share|improve this answer



















  • 1





    This seems like it would work, since restarting my laptop works, but it doesn't.

    – TankorSmash
    Mar 3 '17 at 20:14











  • This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

    – Jim C
    Apr 19 '17 at 2:35











  • Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

    – Jarno
    Feb 26 '18 at 17:59











  • I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

    – Ilia Barahovski
    Apr 9 '18 at 10:19






  • 3





    In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

    – David Oliver
    May 12 '18 at 13:20



















1














To enable all outputs in their default mode, run:



$ xrandr --auto


For more information, see:



https://xorg-team.pages.debian.net/xorg/howto/use-xrandr.html






share|improve this answer


























  • xrandr says the display is disconnected, but it works fine in Windows.

    – Aaron Franke
    Dec 9 '18 at 7:49



















1














I just encountered this issue with my Dell Latitude E5550 using a port extender and two external monitors.



My problems began when I had a power failure. For silly reasons, I could only plug in one of my two monitors, so I opened up the screen display interface and de-activated the screen that didn't have power.



Awesome!



Once the power came back on the process to turn my screen back on was unintuitive. I couldn't see it in the screen display interface even after rebooting or redocking my laptop.



So I tried $ xrandr --auto and got Ubuntu to extend to "one" screen but duplicate to both of my externals (they are two of the same model). Amusing but not useful.



It was only when I clicked on "1 Built-in display" like in the screenshot below that I was able to select my "3rd" screen and turn it on again.



The Screen Display Interface



Doing this flipped the two screens around for some reason and I had to rearrange them but that was easily fixed!






share|improve this answer


























  • lshw -c video doesn't list monitors it lists your drivers.

    – hugo der hungrige
    Mar 11 at 10:14






  • 1





    You're absolutely right! I will edit my answer.

    – Cerberton
    Mar 12 at 11:04



















0














If the external monitor can't be detected by using xrandr --auto, or even by booting to different OS, reboot Ubuntu using a previous kernel. If the computer detects the monitor in the older kernel, you can go back to the latest one without any problems.



I don't know the exact reason why it works, but it definitely worked for me.






share|improve this answer
























  • xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

    – Thorsten Niehues
    Oct 10 '18 at 8:27













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4 Answers
4






active

oldest

votes








4 Answers
4






active

oldest

votes









active

oldest

votes






active

oldest

votes









15














Actually, you don't need to log out. Simply going to a VC with ctrl-alt-f1 and going back to your graphical interface (ctrl-alt-f7) solves the problem for me.



This way, you don't lose all your windows...






share|improve this answer



















  • 1





    This seems like it would work, since restarting my laptop works, but it doesn't.

    – TankorSmash
    Mar 3 '17 at 20:14











  • This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

    – Jim C
    Apr 19 '17 at 2:35











  • Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

    – Jarno
    Feb 26 '18 at 17:59











  • I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

    – Ilia Barahovski
    Apr 9 '18 at 10:19






  • 3





    In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

    – David Oliver
    May 12 '18 at 13:20
















15














Actually, you don't need to log out. Simply going to a VC with ctrl-alt-f1 and going back to your graphical interface (ctrl-alt-f7) solves the problem for me.



This way, you don't lose all your windows...






share|improve this answer



















  • 1





    This seems like it would work, since restarting my laptop works, but it doesn't.

    – TankorSmash
    Mar 3 '17 at 20:14











  • This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

    – Jim C
    Apr 19 '17 at 2:35











  • Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

    – Jarno
    Feb 26 '18 at 17:59











  • I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

    – Ilia Barahovski
    Apr 9 '18 at 10:19






  • 3





    In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

    – David Oliver
    May 12 '18 at 13:20














15












15








15







Actually, you don't need to log out. Simply going to a VC with ctrl-alt-f1 and going back to your graphical interface (ctrl-alt-f7) solves the problem for me.



This way, you don't lose all your windows...






share|improve this answer













Actually, you don't need to log out. Simply going to a VC with ctrl-alt-f1 and going back to your graphical interface (ctrl-alt-f7) solves the problem for me.



This way, you don't lose all your windows...







share|improve this answer












share|improve this answer



share|improve this answer










answered Jan 2 '17 at 10:11









TomôTomô

15113




15113








  • 1





    This seems like it would work, since restarting my laptop works, but it doesn't.

    – TankorSmash
    Mar 3 '17 at 20:14











  • This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

    – Jim C
    Apr 19 '17 at 2:35











  • Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

    – Jarno
    Feb 26 '18 at 17:59











  • I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

    – Ilia Barahovski
    Apr 9 '18 at 10:19






  • 3





    In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

    – David Oliver
    May 12 '18 at 13:20














  • 1





    This seems like it would work, since restarting my laptop works, but it doesn't.

    – TankorSmash
    Mar 3 '17 at 20:14











  • This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

    – Jim C
    Apr 19 '17 at 2:35











  • Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

    – Jarno
    Feb 26 '18 at 17:59











  • I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

    – Ilia Barahovski
    Apr 9 '18 at 10:19






  • 3





    In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

    – David Oliver
    May 12 '18 at 13:20








1




1





This seems like it would work, since restarting my laptop works, but it doesn't.

– TankorSmash
Mar 3 '17 at 20:14





This seems like it would work, since restarting my laptop works, but it doesn't.

– TankorSmash
Mar 3 '17 at 20:14













This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

– Jim C
Apr 19 '17 at 2:35





This trick perfectly solved my problem => a case of replacing the current monitor with a new one while Ubuntu 16.04 LTE is running without reboot/logout. I just had to press Ctrl + Alt + F1 while my old monitor is connected, disconnect it and connect my new monitor, press Ctrl + Alt + F7 and it worked instantly! Thank you so much!

– Jim C
Apr 19 '17 at 2:35













Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

– Jarno
Feb 26 '18 at 17:59





Nice! before this I was kind of frustrated with 17.10. For me actually just doing Ctrl+Alt+F1 and logging back in is sufficient.

– Jarno
Feb 26 '18 at 17:59













I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

– Ilia Barahovski
Apr 9 '18 at 10:19





I'm also with 17.10, with Gnome replacing Unity. And to get back I used Ctrl+Alt+F2, instead of F7

– Ilia Barahovski
Apr 9 '18 at 10:19




3




3





In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

– David Oliver
May 12 '18 at 13:20





In Ubuntu 18.04, it seems the default default graphical interface is F1. So I do Ctrl+Alt+F2, then Ctrl+Alt+F1.

– David Oliver
May 12 '18 at 13:20













1














To enable all outputs in their default mode, run:



$ xrandr --auto


For more information, see:



https://xorg-team.pages.debian.net/xorg/howto/use-xrandr.html






share|improve this answer


























  • xrandr says the display is disconnected, but it works fine in Windows.

    – Aaron Franke
    Dec 9 '18 at 7:49
















1














To enable all outputs in their default mode, run:



$ xrandr --auto


For more information, see:



https://xorg-team.pages.debian.net/xorg/howto/use-xrandr.html






share|improve this answer


























  • xrandr says the display is disconnected, but it works fine in Windows.

    – Aaron Franke
    Dec 9 '18 at 7:49














1












1








1







To enable all outputs in their default mode, run:



$ xrandr --auto


For more information, see:



https://xorg-team.pages.debian.net/xorg/howto/use-xrandr.html






share|improve this answer















To enable all outputs in their default mode, run:



$ xrandr --auto


For more information, see:



https://xorg-team.pages.debian.net/xorg/howto/use-xrandr.html







share|improve this answer














share|improve this answer



share|improve this answer








edited Jul 19 '18 at 17:51









Amanda

4,340104285




4,340104285










answered Jan 28 '18 at 10:35









Gayan WeerakuttiGayan Weerakutti

1,9241428




1,9241428













  • xrandr says the display is disconnected, but it works fine in Windows.

    – Aaron Franke
    Dec 9 '18 at 7:49



















  • xrandr says the display is disconnected, but it works fine in Windows.

    – Aaron Franke
    Dec 9 '18 at 7:49

















xrandr says the display is disconnected, but it works fine in Windows.

– Aaron Franke
Dec 9 '18 at 7:49





xrandr says the display is disconnected, but it works fine in Windows.

– Aaron Franke
Dec 9 '18 at 7:49











1














I just encountered this issue with my Dell Latitude E5550 using a port extender and two external monitors.



My problems began when I had a power failure. For silly reasons, I could only plug in one of my two monitors, so I opened up the screen display interface and de-activated the screen that didn't have power.



Awesome!



Once the power came back on the process to turn my screen back on was unintuitive. I couldn't see it in the screen display interface even after rebooting or redocking my laptop.



So I tried $ xrandr --auto and got Ubuntu to extend to "one" screen but duplicate to both of my externals (they are two of the same model). Amusing but not useful.



It was only when I clicked on "1 Built-in display" like in the screenshot below that I was able to select my "3rd" screen and turn it on again.



The Screen Display Interface



Doing this flipped the two screens around for some reason and I had to rearrange them but that was easily fixed!






share|improve this answer


























  • lshw -c video doesn't list monitors it lists your drivers.

    – hugo der hungrige
    Mar 11 at 10:14






  • 1





    You're absolutely right! I will edit my answer.

    – Cerberton
    Mar 12 at 11:04
















1














I just encountered this issue with my Dell Latitude E5550 using a port extender and two external monitors.



My problems began when I had a power failure. For silly reasons, I could only plug in one of my two monitors, so I opened up the screen display interface and de-activated the screen that didn't have power.



Awesome!



Once the power came back on the process to turn my screen back on was unintuitive. I couldn't see it in the screen display interface even after rebooting or redocking my laptop.



So I tried $ xrandr --auto and got Ubuntu to extend to "one" screen but duplicate to both of my externals (they are two of the same model). Amusing but not useful.



It was only when I clicked on "1 Built-in display" like in the screenshot below that I was able to select my "3rd" screen and turn it on again.



The Screen Display Interface



Doing this flipped the two screens around for some reason and I had to rearrange them but that was easily fixed!






share|improve this answer


























  • lshw -c video doesn't list monitors it lists your drivers.

    – hugo der hungrige
    Mar 11 at 10:14






  • 1





    You're absolutely right! I will edit my answer.

    – Cerberton
    Mar 12 at 11:04














1












1








1







I just encountered this issue with my Dell Latitude E5550 using a port extender and two external monitors.



My problems began when I had a power failure. For silly reasons, I could only plug in one of my two monitors, so I opened up the screen display interface and de-activated the screen that didn't have power.



Awesome!



Once the power came back on the process to turn my screen back on was unintuitive. I couldn't see it in the screen display interface even after rebooting or redocking my laptop.



So I tried $ xrandr --auto and got Ubuntu to extend to "one" screen but duplicate to both of my externals (they are two of the same model). Amusing but not useful.



It was only when I clicked on "1 Built-in display" like in the screenshot below that I was able to select my "3rd" screen and turn it on again.



The Screen Display Interface



Doing this flipped the two screens around for some reason and I had to rearrange them but that was easily fixed!






share|improve this answer















I just encountered this issue with my Dell Latitude E5550 using a port extender and two external monitors.



My problems began when I had a power failure. For silly reasons, I could only plug in one of my two monitors, so I opened up the screen display interface and de-activated the screen that didn't have power.



Awesome!



Once the power came back on the process to turn my screen back on was unintuitive. I couldn't see it in the screen display interface even after rebooting or redocking my laptop.



So I tried $ xrandr --auto and got Ubuntu to extend to "one" screen but duplicate to both of my externals (they are two of the same model). Amusing but not useful.



It was only when I clicked on "1 Built-in display" like in the screenshot below that I was able to select my "3rd" screen and turn it on again.



The Screen Display Interface



Doing this flipped the two screens around for some reason and I had to rearrange them but that was easily fixed!







share|improve this answer














share|improve this answer



share|improve this answer








edited Mar 12 at 11:06

























answered Oct 8 '18 at 13:58









CerbertonCerberton

114




114













  • lshw -c video doesn't list monitors it lists your drivers.

    – hugo der hungrige
    Mar 11 at 10:14






  • 1





    You're absolutely right! I will edit my answer.

    – Cerberton
    Mar 12 at 11:04



















  • lshw -c video doesn't list monitors it lists your drivers.

    – hugo der hungrige
    Mar 11 at 10:14






  • 1





    You're absolutely right! I will edit my answer.

    – Cerberton
    Mar 12 at 11:04

















lshw -c video doesn't list monitors it lists your drivers.

– hugo der hungrige
Mar 11 at 10:14





lshw -c video doesn't list monitors it lists your drivers.

– hugo der hungrige
Mar 11 at 10:14




1




1





You're absolutely right! I will edit my answer.

– Cerberton
Mar 12 at 11:04





You're absolutely right! I will edit my answer.

– Cerberton
Mar 12 at 11:04











0














If the external monitor can't be detected by using xrandr --auto, or even by booting to different OS, reboot Ubuntu using a previous kernel. If the computer detects the monitor in the older kernel, you can go back to the latest one without any problems.



I don't know the exact reason why it works, but it definitely worked for me.






share|improve this answer
























  • xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

    – Thorsten Niehues
    Oct 10 '18 at 8:27


















0














If the external monitor can't be detected by using xrandr --auto, or even by booting to different OS, reboot Ubuntu using a previous kernel. If the computer detects the monitor in the older kernel, you can go back to the latest one without any problems.



I don't know the exact reason why it works, but it definitely worked for me.






share|improve this answer
























  • xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

    – Thorsten Niehues
    Oct 10 '18 at 8:27
















0












0








0







If the external monitor can't be detected by using xrandr --auto, or even by booting to different OS, reboot Ubuntu using a previous kernel. If the computer detects the monitor in the older kernel, you can go back to the latest one without any problems.



I don't know the exact reason why it works, but it definitely worked for me.






share|improve this answer













If the external monitor can't be detected by using xrandr --auto, or even by booting to different OS, reboot Ubuntu using a previous kernel. If the computer detects the monitor in the older kernel, you can go back to the latest one without any problems.



I don't know the exact reason why it works, but it definitely worked for me.







share|improve this answer












share|improve this answer



share|improve this answer










answered Sep 8 '18 at 11:59









Murilo Teixeira SilvaMurilo Teixeira Silva

1




1













  • xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

    – Thorsten Niehues
    Oct 10 '18 at 8:27





















  • xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

    – Thorsten Niehues
    Oct 10 '18 at 8:27



















xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

– Thorsten Niehues
Oct 10 '18 at 8:27







xrandr --auto closed my current GUI sessionn ! But afterwards I could use all 3 Displays: Build in Laptop and two external Display. Displays are connected via USB / DisplayLink

– Thorsten Niehues
Oct 10 '18 at 8:27




















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