Re: DisplayPort not working on 11th gen i7 / UHD Graphics 750
On Tue, Aug 17, 2021 at 01:18:11PM -0300, Eduardo M KALINOWSKI wrote:
> 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?
>
If you installed Testing in the run up to Bullseye release on 20210814, can
I suggest that you retry with the installer that was released as the
final Debian 11 media. The kernel changed in the last few days, it's only
a small thing but might make a difference.
Do you have firmware installed?
I would also suggest that you use the unofficial install medium including
non-free firmware. Firmware detection was significantly improved.
This can be found at
https://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/11.0.0+nonfree/amd64/iso-cd/firmware-11.0.0-amd64-netinst.iso
If there are still problems, an installation report would be helpful.
All the very best, as ever,
Andy Cater
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