Xubuntu: screen does not wake up after being locked











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I run Xubuntu on a Dell Latitude E6530 laptop with Intel graphics.



Ever since upgrading to 18.10 cosmic, the screen remains blank (and powered off) after being locked. Moving the mouse or pressing keys on the keyboard does not turn the screen back on. I found, more or less by accident, that switching to another virtual terminal (Ctrl+Alt+F1) and back will turn the screen back on and allow me to log in again. But this doesn't always work and sometimes after suspend/resume I have to hard-reset the machine in order to use it again.



Any ideas what might be wrong? Some googling leads me to believe that this might be something to do with Light Locker but I don't know how to troubleshoot that.



$ sudo lshw -class display
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:29 memory:f6400000-f67fffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff


What other diagnostic information can I provide?










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  • same problem: see
    – EsmaeelE
    Nov 20 at 14:08

















up vote
1
down vote

favorite












I run Xubuntu on a Dell Latitude E6530 laptop with Intel graphics.



Ever since upgrading to 18.10 cosmic, the screen remains blank (and powered off) after being locked. Moving the mouse or pressing keys on the keyboard does not turn the screen back on. I found, more or less by accident, that switching to another virtual terminal (Ctrl+Alt+F1) and back will turn the screen back on and allow me to log in again. But this doesn't always work and sometimes after suspend/resume I have to hard-reset the machine in order to use it again.



Any ideas what might be wrong? Some googling leads me to believe that this might be something to do with Light Locker but I don't know how to troubleshoot that.



$ sudo lshw -class display
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:29 memory:f6400000-f67fffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff


What other diagnostic information can I provide?










share|improve this question









New contributor




Charles is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • same problem: see
    – EsmaeelE
    Nov 20 at 14:08















up vote
1
down vote

favorite









up vote
1
down vote

favorite











I run Xubuntu on a Dell Latitude E6530 laptop with Intel graphics.



Ever since upgrading to 18.10 cosmic, the screen remains blank (and powered off) after being locked. Moving the mouse or pressing keys on the keyboard does not turn the screen back on. I found, more or less by accident, that switching to another virtual terminal (Ctrl+Alt+F1) and back will turn the screen back on and allow me to log in again. But this doesn't always work and sometimes after suspend/resume I have to hard-reset the machine in order to use it again.



Any ideas what might be wrong? Some googling leads me to believe that this might be something to do with Light Locker but I don't know how to troubleshoot that.



$ sudo lshw -class display
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:29 memory:f6400000-f67fffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff


What other diagnostic information can I provide?










share|improve this question









New contributor




Charles is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I run Xubuntu on a Dell Latitude E6530 laptop with Intel graphics.



Ever since upgrading to 18.10 cosmic, the screen remains blank (and powered off) after being locked. Moving the mouse or pressing keys on the keyboard does not turn the screen back on. I found, more or less by accident, that switching to another virtual terminal (Ctrl+Alt+F1) and back will turn the screen back on and allow me to log in again. But this doesn't always work and sometimes after suspend/resume I have to hard-reset the machine in order to use it again.



Any ideas what might be wrong? Some googling leads me to believe that this might be something to do with Light Locker but I don't know how to troubleshoot that.



$ sudo lshw -class display
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:29 memory:f6400000-f67fffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff


What other diagnostic information can I provide?







xubuntu display dell lock-screen






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Charles is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











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edited Nov 20 at 15:29









Zanna

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asked Nov 20 at 13:39









Charles

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New contributor





Charles is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Charles is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • same problem: see
    – EsmaeelE
    Nov 20 at 14:08




















  • same problem: see
    – EsmaeelE
    Nov 20 at 14:08


















same problem: see
– EsmaeelE
Nov 20 at 14:08






same problem: see
– EsmaeelE
Nov 20 at 14:08

















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