Cfxtrjtrk

I'm running Linux Mint with MATE. My external HDMI monitors no longer work with my single HDMI port.

I don't have another computer with HDMI to test with, but both LG monitors stopped working at the same time with this computer (two separate cables) using the single HDMI port, but my Dell monitor still works with HDMI. The LG monitors work with another computer using USB-C.

When I start up the laptop, the LG power buttons just stay blinking. There is no signal.

lspci -v

00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)

    Subsystem: Dell Haswell-ULT DRAM Controller

    Flags: bus master, fast devsel, latency 0

    Capabilities: <access denied>

    Kernel driver in use: hsw_uncore



00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b) (prog-if 00 [VGA controller])

    Subsystem: Dell Haswell-ULT Integrated Graphics Controller

    Flags: bus master, fast devsel, latency 0, IRQ 43

    Memory at f6c00000 (64-bit, non-prefetchable) [size=4M]

    Memory at e0000000 (64-bit, prefetchable) [size=256M]

    I/O ports at f000 [size=64]

    [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]

    Capabilities: <access denied>

    Kernel driver in use: i915

    Kernel modules: i915



00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)

    Subsystem: Dell Haswell-ULT HD Audio Controller

    Flags: bus master, fast devsel, latency 0, IRQ 47

    Memory at f7c34000 (64-bit, non-prefetchable) [size=16K]

    Capabilities: <access denied>

    Kernel driver in use: snd_hda_intel

    Kernel modules: snd_hda_intel



00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04) (prog-if 30 [XHCI])

    Subsystem: Dell 8 Series USB xHCI HC

    Flags: bus master, medium devsel, latency 0, IRQ 40

    Memory at f7c20000 (64-bit, non-prefetchable) [size=64K]

    Capabilities: <access denied>

    Kernel driver in use: xhci_hcd



00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)

    Subsystem: Dell 8 Series HECI

    Flags: bus master, fast devsel, latency 0, IRQ 44

    Memory at f7c3f000 (64-bit, non-prefetchable) [size=32]

    Capabilities: <access denied>

    Kernel driver in use: mei_me

    Kernel modules: mei_me



00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I218-LM (rev 04)

    Subsystem: Dell Ethernet Connection I218-LM

    Flags: bus master, fast devsel, latency 0, IRQ 41

    Memory at f7c00000 (32-bit, non-prefetchable) [size=128K]

    Memory at f7c3c000 (32-bit, non-prefetchable) [size=4K]

    I/O ports at f080 [disabled] [size=32]

    Capabilities: <access denied>

    Kernel driver in use: e1000e

    Kernel modules: e1000e



00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)

    Subsystem: Dell 8 Series HD Audio Controller

    Flags: bus master, fast devsel, latency 0, IRQ 46

    Memory at f7c30000 (64-bit, non-prefetchable) [size=16K]

    Capabilities: <access denied>

    Kernel driver in use: snd_hda_intel

    Kernel modules: snd_hda_intel



00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 1 (rev e4) (prog-if 00 [Normal decode])

    Flags: bus master, fast devsel, latency 0, IRQ 16

    Bus: primary=00, secondary=01, subordinate=01, sec-latency=0

    Memory behind bridge: f7b00000-f7bfffff

    Capabilities: <access denied>

    Kernel driver in use: pcieport

    Kernel modules: shpchp



00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4) (prog-if 00 [Normal decode])

    Flags: bus master, fast devsel, latency 0, IRQ 19

    Bus: primary=00, secondary=02, subordinate=02, sec-latency=0

    Memory behind bridge: f7a00000-f7afffff

    Capabilities: <access denied>

    Kernel driver in use: pcieport

    Kernel modules: shpchp



00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4) (prog-if 00 [Normal decode])

    Flags: bus master, fast devsel, latency 0, IRQ 16

    Bus: primary=00, secondary=03, subordinate=03, sec-latency=0

    I/O behind bridge: 0000e000-0000efff

    Memory behind bridge: f7000000-f79fffff

    Prefetchable memory behind bridge: 00000000f0000000-00000000f09fffff

    Capabilities: <access denied>

    Kernel driver in use: pcieport

    Kernel modules: shpchp



00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04) (prog-if 20 [EHCI])

    Subsystem: Dell 8 Series USB EHCI

    Flags: bus master, medium devsel, latency 0, IRQ 21

    Memory at f7c3b000 (32-bit, non-prefetchable) [size=1K]

    Capabilities: <access denied>

    Kernel driver in use: ehci-pci



00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)

    Subsystem: Dell 8 Series LPC Controller

    Flags: bus master, medium devsel, latency 0

    Capabilities: <access denied>

    Kernel driver in use: lpc_ich

    Kernel modules: lpc_ich



00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04) (prog-if 01 [AHCI 1.0])

    Subsystem: Dell 8 Series SATA Controller 1 [AHCI mode]

    Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 42

    I/O ports at f0d0 [size=8]

    I/O ports at f0c0 [size=4]

    I/O ports at f0b0 [size=8]

    I/O ports at f0a0 [size=4]

    I/O ports at f060 [size=32]

    Memory at f7c3a000 (32-bit, non-prefetchable) [size=2K]

    Capabilities: <access denied>

    Kernel driver in use: ahci

    Kernel modules: ahci



00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)

    Subsystem: Dell 8 Series SMBus Controller

    Flags: medium devsel, IRQ 255

    Memory at f7c39000 (64-bit, non-prefetchable) [size=256]

    I/O ports at f040 [size=32]

    Kernel modules: i2c_i801



01:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev 01) (prog-if 01)

    Subsystem: Dell SD/MMC Card Reader Controller

    Flags: bus master, fast devsel, latency 0, IRQ 16

    Memory at f7b01000 (32-bit, non-prefetchable) [size=4K]

    Memory at f7b00000 (32-bit, non-prefetchable) [size=2K]

    Capabilities: <access denied>

    Kernel driver in use: sdhci-pci

    Kernel modules: sdhci_pci



02:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)

    Subsystem: Intel Corporation Dual Band Wireless-AC 7260

    Flags: bus master, fast devsel, latency 0, IRQ 45

    Memory at f7a00000 (64-bit, non-prefetchable) [size=8K]

    Capabilities: <access denied>

    Kernel driver in use: iwlwifi

    Kernel modules: iwlwifi

inxi -Fx

System:

  Host: jorge-Latitude-E5440 Kernel: 4.15.0-20-generic x86_64 bits: 64 

  compiler: gcc v: 7.3.0 Desktop: MATE 1.20.1 Distro: Linux Mint 19.1 Tessa 

  base: Ubuntu 18.04 bionic 

Machine:

  Type: Laptop System: Dell product: Latitude E5440 v: 00 

  serial: <root required> 

  Mobo: Dell model: 03CHJ4 v: A00 serial: <root required> UEFI: Dell v: A21 

  date: 02/01/2018 

Battery:

  ID-1: BAT0 charge: 40.7 Wh condition: 49.3/66.6 Wh (74%) 

  model: LGC-LGC3.0 DELL NVWGM63 status: Charging 

CPU:

  Topology: Dual Core model: Intel Core i5-4210U bits: 64 type: MT MCP 

  arch: Haswell rev: 1 L2 cache: 3072 KiB 

  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19155 

  Speed: 998 MHz min/max: 800/2700 MHz Core speeds (MHz): 1: 923 2: 899 

  3: 899 4: 904 

Graphics:

  Device-1: Intel Haswell-ULT Integrated Graphics vendor: Dell driver: i915 

  v: kernel bus ID: 00:02.0 

  Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa 

  resolution: 1366x768~60Hz 

  OpenGL: renderer: Mesa DRI Intel Haswell Mobile v: 4.5 Mesa 18.0.5 

  direct render: Yes 

Audio:

  Device-1: Intel Haswell-ULT HD Audio vendor: Dell driver: snd_hda_intel 

  v: kernel bus ID: 00:03.0 

  Device-2: Intel 8 Series HD Audio vendor: Dell driver: snd_hda_intel 

  v: kernel bus ID: 00:1b.0 

  Sound Server: ALSA v: k4.15.0-20-generic 

Network:

  Device-1: Intel Ethernet I218-LM vendor: Dell driver: e1000e v: 3.2.6-k 

  port: f080 bus ID: 00:19.0 

  IF: eno1 state: down mac: 34:e6:d7:10:bb:8f 

  Device-2: Intel Wireless 7260 driver: iwlwifi v: kernel port: f040 

  bus ID: 02:00.0 

  IF: wlp2s0 state: up mac: 48:51:b7:06:b2:10 

  IF-ID-1: docker0 state: down mac: 02:42:58:2f:db:5c 

Drives:

  Local Storage: total: 465.76 GiB used: 41.99 GiB (9.0%) 

  ID-1: /dev/sda vendor: Western Digital model: WD5000LPLX-08ZNTT0 

  size: 465.76 GiB 

Partition:

  ID-1: / size: 95.62 GiB used: 41.96 GiB (43.9%) fs: ext4 dev: /dev/sda6 

Sensors:

  System Temperatures: cpu: 50.0 C mobo: 37.0 C sodimm: 37.0 C 

  Fan Speeds (RPM): cpu: 0 

Info:

  Processes: 202 Uptime: 10m Memory: 7.70 GiB used: 1.07 GiB (13.9%) 

  Init: systemd runlevel: 5 Compilers: gcc: 7.3.0 Shell: bash v: 4.4.19 

  inxi: 3.0.27 

xrandr --verbose

Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192

eDP-1 connected primary 1366x768+0+0 (0x46) normal (normal left inverted right x axis y axis) 309mm x 174mm

    Identifier: 0x42

    Timestamp:  38912

    Subpixel:   unknown

    Gamma:      1.0:1.0:1.0

    Brightness: 1.0

    Clones:    

    CRTC:       0

    CRTCs:      0 1 2

    Transform:  1.000000 0.000000 0.000000

                0.000000 1.000000 0.000000

                0.000000 0.000000 1.000000

               filter: 

    EDID: 

        00ffffffffffff004c83415400000000

        00160104901f11780a4bc59c57548c27

        17505400000001010101010101010101

        0101010101018a1b565a500027303020

        550035ae1000001a5c12565a50002730

        3020550035ae1000001a000000fe0039

        335634488031343041540a2000000000

        00004121940010000001010a202000e9

    scaling mode: Full aspect 

        supported: Full, Center, Full aspect

    Broadcast RGB: Automatic 

        supported: Automatic, Full, Limited 16:235

    audio: auto 

        supported: force-dvi, off, auto, on

    non-desktop: 0 

        range: (0, 1)

    link-status: Good 

        supported: Good, Bad

  1366x768 (0x46) 70.500MHz +HSync -VSync *current +preferred

        h: width  1366 start 1414 end 1446 total 1456 skew    0 clock  48.42KHz

        v: height  768 start  773 end  778 total  807           clock  60.00Hz

  1366x768 (0x47) 47.000MHz +HSync -VSync

        h: width  1366 start 1414 end 1446 total 1456 skew    0 clock  32.28KHz

        v: height  768 start  773 end  778 total  807           clock  40.00Hz

  1360x768 (0x48) 84.750MHz -HSync +VSync

        h: width  1360 start 1432 end 1568 total 1776 skew    0 clock  47.72KHz

        v: height  768 start  771 end  781 total  798           clock  59.80Hz

  1360x768 (0x49) 72.000MHz +HSync -VSync

        h: width  1360 start 1408 end 1440 total 1520 skew    0 clock  47.37KHz

        v: height  768 start  771 end  781 total  790           clock  59.96Hz

  1280x720 (0x4a) 156.125MHz -HSync +VSync DoubleScan

        h: width  1280 start 1376 end 1512 total 1744 skew    0 clock  89.52KHz

        v: height  720 start  721 end  724 total  746           clock  60.00Hz

  1280x720 (0x4b) 120.750MHz +HSync -VSync DoubleScan

        h: width  1280 start 1304 end 1320 total 1360 skew    0 clock  88.79KHz

        v: height  720 start  721 end  724 total  740           clock  59.99Hz

  1280x720 (0x4c) 74.500MHz -HSync +VSync

        h: width  1280 start 1344 end 1472 total 1664 skew    0 clock  44.77KHz

        v: height  720 start  723 end  728 total  748           clock  59.86Hz

  1280x720 (0x4d) 63.750MHz +HSync -VSync

        h: width  1280 start 1328 end 1360 total 1440 skew    0 clock  44.27KHz

        v: height  720 start  723 end  728 total  741           clock  59.74Hz

  1024x768 (0x4e) 133.475MHz -HSync +VSync DoubleScan

        h: width  1024 start 1100 end 1212 total 1400 skew    0 clock  95.34KHz

        v: height  768 start  768 end  770 total  794           clock  60.04Hz

  1024x768 (0x4f) 65.000MHz -HSync -VSync

        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz

        v: height  768 start  771 end  777 total  806           clock  60.00Hz

  960x720 (0x50) 117.000MHz -HSync +VSync DoubleScan

        h: width   960 start 1024 end 1128 total 1300 skew    0 clock  90.00KHz

        v: height  720 start  720 end  722 total  750           clock  60.00Hz

  928x696 (0x51) 109.150MHz -HSync +VSync DoubleScan

        h: width   928 start  976 end 1088 total 1264 skew    0 clock  86.35KHz

        v: height  696 start  696 end  698 total  719           clock  60.05Hz

  896x672 (0x52) 102.400MHz -HSync +VSync DoubleScan

        h: width   896 start  960 end 1060 total 1224 skew    0 clock  83.66KHz

        v: height  672 start  672 end  674 total  697           clock  60.01Hz

  1024x576 (0x53) 98.500MHz -HSync +VSync DoubleScan

        h: width  1024 start 1092 end 1200 total 1376 skew    0 clock  71.58KHz

        v: height  576 start  577 end  580 total  597           clock  59.95Hz

  1024x576 (0x54) 78.375MHz +HSync -VSync DoubleScan

        h: width  1024 start 1048 end 1064 total 1104 skew    0 clock  70.99KHz

        v: height  576 start  577 end  580 total  592           clock  59.96Hz

  1024x576 (0x55) 46.500MHz -HSync +VSync

        h: width  1024 start 1064 end 1160 total 1296 skew    0 clock  35.88KHz

        v: height  576 start  579 end  584 total  599           clock  59.90Hz

  1024x576 (0x56) 42.000MHz +HSync -VSync

        h: width  1024 start 1072 end 1104 total 1184 skew    0 clock  35.47KHz

        v: height  576 start  579 end  584 total  593           clock  59.82Hz

  960x600 (0x57) 96.625MHz -HSync +VSync DoubleScan

        h: width   960 start 1028 end 1128 total 1296 skew    0 clock  74.56KHz

        v: height  600 start  601 end  604 total  622           clock  59.93Hz

  960x600 (0x58) 77.000MHz +HSync -VSync DoubleScan

        h: width   960 start  984 end 1000 total 1040 skew    0 clock  74.04KHz

        v: height  600 start  601 end  604 total  617           clock  60.00Hz

  960x540 (0x59) 86.500MHz -HSync +VSync DoubleScan

        h: width   960 start 1024 end 1124 total 1288 skew    0 clock  67.16KHz

        v: height  540 start  541 end  544 total  560           clock  59.96Hz

  960x540 (0x5a) 69.250MHz +HSync -VSync DoubleScan

        h: width   960 start  984 end 1000 total 1040 skew    0 clock  66.59KHz

        v: height  540 start  541 end  544 total  555           clock  59.99Hz

  960x540 (0x5b) 40.750MHz -HSync +VSync

        h: width   960 start  992 end 1088 total 1216 skew    0 clock  33.51KHz

        v: height  540 start  543 end  548 total  562           clock  59.63Hz

  960x540 (0x5c) 37.250MHz +HSync -VSync

        h: width   960 start 1008 end 1040 total 1120 skew    0 clock  33.26KHz

        v: height  540 start  543 end  548 total  556           clock  59.82Hz

  800x600 (0x5d) 81.000MHz +HSync +VSync DoubleScan

        h: width   800 start  832 end  928 total 1080 skew    0 clock  75.00KHz

        v: height  600 start  600 end  602 total  625           clock  60.00Hz

  800x600 (0x5e) 40.000MHz +HSync +VSync

        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz

        v: height  600 start  601 end  605 total  628           clock  60.32Hz

  800x600 (0x5f) 36.000MHz +HSync +VSync

        h: width   800 start  824 end  896 total 1024 skew    0 clock  35.16KHz

        v: height  600 start  601 end  603 total  625           clock  56.25Hz

  840x525 (0x60) 73.125MHz -HSync +VSync DoubleScan

        h: width   840 start  892 end  980 total 1120 skew    0 clock  65.29KHz

        v: height  525 start  526 end  529 total  544           clock  60.01Hz

  840x525 (0x61) 59.500MHz +HSync -VSync DoubleScan

        h: width   840 start  864 end  880 total  920 skew    0 clock  64.67KHz

        v: height  525 start  526 end  529 total  540           clock  59.88Hz

  864x486 (0x62) 32.500MHz -HSync +VSync

        h: width   864 start  888 end  968 total 1072 skew    0 clock  30.32KHz

        v: height  486 start  489 end  494 total  506           clock  59.92Hz

  864x486 (0x63) 30.500MHz +HSync -VSync

        h: width   864 start  912 end  944 total 1024 skew    0 clock  29.79KHz

        v: height  486 start  489 end  494 total  500           clock  59.57Hz

  800x512 (0x64) 51.562MHz +HSync +VSync DoubleScan

        h: width   800 start  800 end  828 total  832 skew    0 clock  61.97KHz

        v: height  512 start  512 end  514 total  515           clock  60.17Hz

  700x525 (0x65) 61.000MHz +HSync +VSync DoubleScan

        h: width   700 start  744 end  820 total  940 skew    0 clock  64.89KHz

        v: height  525 start  526 end  532 total  541           clock  59.98Hz

  800x450 (0x66) 59.125MHz -HSync +VSync DoubleScan

        h: width   800 start  848 end  928 total 1056 skew    0 clock  55.99KHz

        v: height  450 start  451 end  454 total  467           clock  59.95Hz

  800x450 (0x67) 48.750MHz +HSync -VSync DoubleScan

        h: width   800 start  824 end  840 total  880 skew    0 clock  55.40KHz

        v: height  450 start  451 end  454 total  463           clock  59.82Hz

  640x512 (0x68) 54.000MHz +HSync +VSync DoubleScan

        h: width   640 start  664 end  720 total  844 skew    0 clock  63.98KHz

        v: height  512 start  512 end  514 total  533           clock  60.02Hz

  720x450 (0x69) 53.250MHz -HSync +VSync DoubleScan

        h: width   720 start  760 end  836 total  952 skew    0 clock  55.93KHz

        v: height  450 start  451 end  454 total  467           clock  59.89Hz

  700x450 (0x6a) 51.750MHz -HSync +VSync DoubleScan

        h: width   700 start  740 end  812 total  924 skew    0 clock  56.01KHz

        v: height  450 start  451 end  456 total  467           clock  59.96Hz

  700x450 (0x6b) 43.250MHz +HSync -VSync DoubleScan

        h: width   700 start  724 end  740 total  780 skew    0 clock  55.45KHz

        v: height  450 start  451 end  456 total  463           clock  59.88Hz

  640x480 (0x6c) 54.000MHz +HSync +VSync DoubleScan

        h: width   640 start  688 end  744 total  900 skew    0 clock  60.00KHz

        v: height  480 start  480 end  482 total  500           clock  60.00Hz

  640x480 (0x6d) 25.175MHz -HSync -VSync

        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz

        v: height  480 start  490 end  492 total  525           clock  59.94Hz

  720x405 (0x6e) 22.500MHz -HSync +VSync

        h: width   720 start  744 end  808 total  896 skew    0 clock  25.11KHz

        v: height  405 start  408 end  413 total  422           clock  59.51Hz

  720x405 (0x6f) 21.750MHz +HSync -VSync

        h: width   720 start  768 end  800 total  880 skew    0 clock  24.72KHz

        v: height  405 start  408 end  413 total  419           clock  58.99Hz

  684x384 (0x70) 42.625MHz -HSync +VSync DoubleScan

        h: width   684 start  720 end  788 total  892 skew    0 clock  47.79KHz

        v: height  384 start  385 end  390 total  399           clock  59.88Hz

  684x384 (0x71) 36.125MHz +HSync -VSync DoubleScan

        h: width   684 start  708 end  724 total  764 skew    0 clock  47.28KHz

        v: height  384 start  385 end  390 total  395           clock  59.85Hz

  680x384 (0x72) 42.375MHz -HSync +VSync DoubleScan

        h: width   680 start  716 end  784 total  888 skew    0 clock  47.72KHz

        v: height  384 start  385 end  390 total  399           clock  59.80Hz

  680x384 (0x73) 36.000MHz +HSync -VSync DoubleScan

        h: width   680 start  704 end  720 total  760 skew    0 clock  47.37KHz

        v: height  384 start  385 end  390 total  395           clock  59.96Hz

  640x400 (0x74) 41.750MHz -HSync +VSync DoubleScan

        h: width   640 start  676 end  740 total  840 skew    0 clock  49.70KHz

        v: height  400 start  401 end  404 total  415           clock  59.88Hz

  640x400 (0x75) 35.500MHz +HSync -VSync DoubleScan

        h: width   640 start  664 end  680 total  720 skew    0 clock  49.31KHz

        v: height  400 start  401 end  404 total  411           clock  59.98Hz

  576x432 (0x76) 40.810MHz -HSync +VSync DoubleScan

        h: width   576 start  608 end  668 total  760 skew    0 clock  53.70KHz

        v: height  432 start  432 end  434 total  447           clock  60.06Hz

  640x360 (0x77) 37.250MHz -HSync +VSync DoubleScan

        h: width   640 start  672 end  736 total  832 skew    0 clock  44.77KHz

        v: height  360 start  361 end  364 total  374           clock  59.86Hz

  640x360 (0x78) 31.875MHz +HSync -VSync DoubleScan

        h: width   640 start  664 end  680 total  720 skew    0 clock  44.27KHz

        v: height  360 start  361 end  364 total  370           clock  59.83Hz

  640x360 (0x79) 18.000MHz -HSync +VSync

        h: width   640 start  664 end  720 total  800 skew    0 clock  22.50KHz

        v: height  360 start  363 end  368 total  376           clock  59.84Hz

  640x360 (0x7a) 17.750MHz +HSync -VSync

        h: width   640 start  688 end  720 total  800 skew    0 clock  22.19KHz

        v: height  360 start  363 end  368 total  374           clock  59.32Hz

  512x384 (0x7b) 32.500MHz -HSync -VSync DoubleScan

        h: width   512 start  524 end  592 total  672 skew    0 clock  48.36KHz

        v: height  384 start  385 end  388 total  403           clock  60.00Hz

  512x288 (0x7c) 23.250MHz -HSync +VSync DoubleScan

        h: width   512 start  532 end  580 total  648 skew    0 clock  35.88KHz

        v: height  288 start  289 end  292 total  299           clock  60.00Hz

  512x288 (0x7d) 21.000MHz +HSync -VSync DoubleScan

        h: width   512 start  536 end  552 total  592 skew    0 clock  35.47KHz

        v: height  288 start  289 end  292 total  296           clock  59.92Hz

  480x270 (0x7e) 20.375MHz -HSync +VSync DoubleScan

        h: width   480 start  496 end  544 total  608 skew    0 clock  33.51KHz

        v: height  270 start  271 end  274 total  281           clock  59.63Hz

  480x270 (0x7f) 18.625MHz +HSync -VSync DoubleScan

        h: width   480 start  504 end  520 total  560 skew    0 clock  33.26KHz

        v: height  270 start  271 end  274 total  278           clock  59.82Hz

  400x300 (0x80) 20.000MHz +HSync +VSync DoubleScan

        h: width   400 start  420 end  484 total  528 skew    0 clock  37.88KHz

        v: height  300 start  300 end  302 total  314           clock  60.32Hz

  400x300 (0x81) 18.000MHz +HSync +VSync DoubleScan

        h: width   400 start  412 end  448 total  512 skew    0 clock  35.16KHz

        v: height  300 start  300 end  301 total  312           clock  56.34Hz

  432x243 (0x82) 16.250MHz -HSync +VSync DoubleScan

        h: width   432 start  444 end  484 total  536 skew    0 clock  30.32KHz

        v: height  243 start  244 end  247 total  253           clock  59.92Hz

  432x243 (0x83) 15.250MHz +HSync -VSync DoubleScan

        h: width   432 start  456 end  472 total  512 skew    0 clock  29.79KHz

        v: height  243 start  244 end  247 total  250           clock  59.57Hz

  320x240 (0x84) 12.587MHz -HSync -VSync DoubleScan

        h: width   320 start  328 end  376 total  400 skew    0 clock  31.47KHz

        v: height  240 start  245 end  246 total  262           clock  60.05Hz

  360x202 (0x85) 11.250MHz -HSync +VSync DoubleScan

        h: width   360 start  372 end  404 total  448 skew    0 clock  25.11KHz

        v: height  202 start  204 end  206 total  211           clock  59.51Hz

  360x202 (0x86) 10.875MHz +HSync -VSync DoubleScan

        h: width   360 start  384 end  400 total  440 skew    0 clock  24.72KHz

        v: height  202 start  204 end  206 total  209           clock  59.13Hz

  320x180 (0x87)  9.000MHz -HSync +VSync DoubleScan

        h: width   320 start  332 end  360 total  400 skew    0 clock  22.50KHz

        v: height  180 start  181 end  184 total  188           clock  59.84Hz

  320x180 (0x88)  8.875MHz +HSync -VSync DoubleScan

        h: width   320 start  344 end  360 total  400 skew    0 clock  22.19KHz

        v: height  180 start  181 end  184 total  187           clock  59.32Hz

DP-1 disconnected (normal left inverted right x axis y axis)

    Identifier: 0x43

    Timestamp:  38912

    Subpixel:   unknown

    Clones:     HDMI-1

    CRTCs:      0 1 2

    Transform:  1.000000 0.000000 0.000000

                0.000000 1.000000 0.000000

                0.000000 0.000000 1.000000

               filter: 

    Broadcast RGB: Automatic 

        supported: Automatic, Full, Limited 16:235

    audio: auto 

        supported: force-dvi, off, auto, on

    non-desktop: 0 

        range: (0, 1)

    link-status: Good 

        supported: Good, Bad

HDMI-1 disconnected (normal left inverted right x axis y axis)

    Identifier: 0x44

    Timestamp:  38912

    Subpixel:   unknown

    Clones:     DP-1

    CRTCs:      0 1 2

    Transform:  1.000000 0.000000 0.000000

                0.000000 1.000000 0.000000

                0.000000 0.000000 1.000000

               filter: 

    aspect ratio: Automatic 

        supported: Automatic, 4:3, 16:9

    Broadcast RGB: Automatic 

        supported: Automatic, Full, Limited 16:235

    audio: auto 

        supported: force-dvi, off, auto, on

    non-desktop: 0 

        range: (0, 1)

    link-status: Good 

        supported: Good, Bad

cat /etc/linuxmint/info

RELEASE=19.1

CODENAME=tessa

EDITION="Cinnamon"

DESCRIPTION="Linux Mint 19.1 Tessa"

DESKTOP=Gnome

TOOLKIT=GTK

NEW_FEATURES_URL=https://www.linuxmint.com/rel_tessa_cinnamon_whatsnew.php

RELEASE_NOTES_URL=https://www.linuxmint.com/rel_tessa_cinnamon.php

USER_GUIDE_URL=https://www.linuxmint.com/documentation.php

GRUB_TITLE=Linux Mint 19.1 Cinnamon

I reinstalled the drivers, rebooted, and now the two LG monitors work again.

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade &&  sudo ubuntu-drivers autoinstall