DisplayPort not working on 11th gen i7 / UHD Graphics 750
I've installed Debian testing on a new computer, with an Intel Core
i7-11700 processor.
After I added "i915.force_probe=4c8a" to the kernel command-line,
graphics work, but only on the HDMI port. A second monitor in the
DisplayPort is not recognized:
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x
axis y axis) 477mm x 268mm
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
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
The cable and monitor are working fine. Dual screens work on Grub and in
the beginning of boot, but once the console font changes, I only get
HDMI output.
Some more information:
$ uname -a
Linux gandalf 5.10.0-8-amd64 #1 SMP Debian 5.10.46-4 (2021-08-03) x86_64
GNU/Linux
$ inxi -G
Graphics: Device-1: Intel RocketLake-S GT1 [UHD Graphics 750] driver:
i915 v: kernel
Display: x11 server: X.Org 1.20.11 driver: loaded:
modesetting unloaded: fbdev
resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel Graphics (RKL GT1) v: 4.6 Mesa
20.3.5
$ lspci -k -nn -d 8086:4c8a
00:02.0 VGA compatible controller [0300]: Intel Corporation RocketLake-S
GT1 [UHD Graphics 750] [8086:4c8a] (rev 04)
DeviceName: Onboard - Video
Subsystem: ASUSTeK Computer Inc. Device [1043:8694]
Kernel driver in use: i915
Kernel modules: i915
Anyone has any idea? Or is there any extra information that might be useful?
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