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Since the update to kernel 5.10.1 (and still wtih 5.10.9), my external monitor is recognized but stays black. The laptop is a Dell Latitude 7410 2-in-1
The issue is possibly related to [SOLVED] Kernel 5.10 External Monitor Issues. There are two noticable difference: I could not find any errors in any logs, and the other post was fixed by an update of the NVidia driver, and I don't have a NVidia GPU.
It works with kernel 5.9.14 (the last of the 5.9's).
What happens since kernel 5.10.1:
The second monitor is properly detected by xrandr (see dump below), and the monitor detects it has been plugged in. However, the screen simply stays black.
I could not find any errors in various logs (dmesg, Xorg).
I do not see any performance issues (often mentionned in i915 related posts).
Upon pluging the HDMI cable in, Xorg.0.log gets a
[ 3889.072] (II) intel(0): switch to mode 1920x1080@60.0 on DP1 using pipe 1, position (0, 0), rotation normal, reflection none I tried various xrandr options (changing --mode, --brightness...). Nothing worked (but not errors either).
(I also tested under Wayland, and it does not work either.)
Since I could not find any error reported anywhere, I am rather clueless. Has anyone encountered the same thing? Does anyone have an idea? Thanks!!
The xrandr output:
$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
1920x1080 59.99*+ 59.93 47.99
1680x1050 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 1920x1080+0+0 (normal left inverted right x axis y axis) 430mm x 240mm
1600x900 60.00 +
1920x1080 60.00* 50.00 59.94
1920x1080i 60.00 50.00 59.94
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)Last edited by kihanos (2021-01-23 19:44:20)
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It seems to be fixed in the latest git version of the kernel, possibly because of the patch following this bug report. Anyway, marking as solved.
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