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This issue most often happens when my laptop goes to sleep, however also happens in some cases when I disconnect the HDMI cable and re-plug it in. I also use another monitor through USB-C -> DisplayPort which has not had any issues (and is plugged in and working when the problematic monitor stops working).
When I plug the HDMI cable into another device, let it connect (which always works), and then reconnect it to my laptop, it generally connects perfectly.
Each time I plug in the HDMI cable I get two of these log messages in /var/log/Xorg.0.log:
[ 1905.490] (--) intel(0): HDMI max TMDS frequency 250000KHz
[ 1905.491] (--) intel(0): HDMI max TMDS frequency 250000KHzHowever these logs occur even when reconnecting the HDMI cable works and enables the display.
I use autorandr to automatically control xrandr, and when unplugging the monitor, I get this output in the journal:
Nov 06 11:04:13 ****-workstation autorandr[184037]: Warning: Output DP3 has a transformation applied. Could not determine correct mode! Using `3840x2160'.
Nov 06 11:04:13 ****-workstation autorandr[184037]: Failed to load profile 'default': Profile not found (line 1420)
Nov 06 11:04:13 ****-workstation autorandr[184037]: autorandr running as user **** (started from batch instance)
Nov 06 11:04:13 ****-workstation autorandr[184037]: docked
Nov 06 11:04:13 ****-workstation autorandr[184037]: mobileAnd plugging it back in I get:
Nov 06 11:05:04 ****-workstation autorandr[188127]: Config already loaded
Nov 06 11:05:04 ****-workstation autorandr[188127]: autorandr running as user **** (started from batch instance)
Nov 06 11:05:04 ****-workstation autorandr[188127]: docked (detected) (current)
Nov 06 11:05:04 ****-workstation autorandr[188127]: mobilePerhaps relevant from /var/log/Xorg.0.log on boot (the display in question is listed as DP3 by xrandr):
[ 5.003] (II) config/udev: Adding input device DP-3 (/dev/input/event14)
[ 5.003] (**) DP-3: Applying InputClass "libinput keyboard catchall"
[ 5.003] (II) Using input driver 'libinput' for 'DP-3'
[ 5.003] (**) DP-3: always reports core events
[ 5.003] (**) Option "Device" "/dev/input/event14"
[ 5.003] (**) Option "_source" "server/udev"
[ 5.005] (II) event14 - DP-3: is tagged by udev as: Keyboard Pointingstick
[ 5.006] (II) event14 - DP-3: device is a pointer
[ 5.006] (II) event14 - DP-3: device is a keyboard
[ 5.007] (II) event14 - DP-3: device removed
[ 5.024] (II) libinput: DP-3: needs a virtual subdevice
[ 5.024] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:02.0/rc/rc0/input20/event14"
[ 5.024] (II) XINPUT: Adding extended input device "DP-3" (type: MOUSE, id 10)
[ 5.024] (**) Option "AccelerationScheme" "none"
[ 5.024] (**) DP-3: (accel) selected scheme none/0
[ 5.024] (**) DP-3: (accel) acceleration factor: 2.000
[ 5.024] (**) DP-3: (accel) acceleration threshold: 4
[ 5.026] (II) event14 - DP-3: is tagged by udev as: Keyboard Pointingstick
[ 5.027] (II) event14 - DP-3: device is a pointer
[ 5.027] (II) event14 - DP-3: device is a keyboardOutput of xrandr (at this time the USB-C/DisplayPort monitor (DP1) is working, and the HDMI monitor (DP3) is showing "No Signal"):
Screen 0: minimum 8 x 8, current 11520 x 2160, maximum 32767 x 32767
eDP1 connected primary 3840x2160+7680+0 (normal left inverted right x axis y axis) 340mm x 190mm
3840x2160 60.00*+ 59.97
3200x1800 59.96 60.00 59.94
2880x1620 60.00 59.96 59.97
2560x1600 59.99 59.97
2560x1440 59.96 60.00 59.95
2048x1536 60.00
1920x1440 60.00
1856x1392 60.01
1792x1344 60.01
2048x1152 60.00 59.90 59.91
1920x1200 59.88 59.95
1920x1080 59.96 60.00 59.93
1600x1200 60.00
1680x1050 59.95 59.88
1400x1050 59.98
1600x900 60.00 59.95 59.82
1280x1024 60.02
1400x900 59.96 59.88
1280x960 60.00
1368x768 60.00 59.88 59.85
1280x800 59.81 59.91
1280x720 59.86 60.00 59.74
1024x768 60.00
1024x576 60.00 59.90 59.82
960x540 60.00 59.63 59.82
800x600 60.32 56.25
864x486 60.00 59.92 59.57
640x480 59.94
720x405 59.51 60.00 58.99
640x360 59.84 59.32 60.00
DP1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x960 60.00
1152x864 75.00
1280x720 60.00 50.00 59.94
1440x576 50.00
1024x768 75.03 70.07 60.00
1440x480 60.00 59.94
832x624 74.55
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DP2 disconnected (normal left inverted right x axis y axis)
DP3 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 590mm x 330mm
2560x1440 59.95*+
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1280x800 59.91
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
VIRTUAL1 disconnected (normal left inverted right x axis y axis)Relevant entry from lspci -v:
00:02.0 VGA compatible controller: Intel Corporation CoffeeLake-H GT2 [UHD Graphics 630] (prog-if 00 [VGA controller])
DeviceName: Onboard IGD
Subsystem: Dell Device 0905
Flags: bus master, fast devsel, latency 0, IRQ 178
Memory at eb000000 (64-bit, non-prefetchable) [size=16M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [100] Process Address Space ID (PASID)
Capabilities: [200] Address Translation Service (ATS)
Capabilities: [300] Page Request Interface (PRI)
Kernel driver in use: i915
Kernel modules: i915Offline
Some additional behavior I have observed:
When the monitor is working properly, I am able to unplug and replug the monitor several times, and it will reconnect properly. However after some number of reconnections it fails to reconnect, and seems to be in the same condition as when it stops working after the laptop goes to sleep.
When the monitor is not connecting properly, unplugging it and plugging it back in several times it still refuses to connect, but sometimes (after some number of times re-plugging it in) it successfully connects.
In some cases when it shows an image, it seems to get in a loop where it shows the output for a second or two, then says no input is detected, and then reconnects and shows it again, over and over.
I have tried using multiple HDMI cables, with no luck. Since the issue is only present on this specific device, that is what I expected, but still tried it out.
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