I3 not working properly video/graphic issues

bungali · October 13, 2021, 3:00pm

Found a fix if you happen to be using intel iGPU.
Create the following file (dom0) /etc/X11/xorg.conf.d/20-intel.conf

Section "Device"
        Identifier "Intel Graphics"
        Driver "Intel"
EndSection

I also happened to change GRUB2 Linux kernel option
i915.alpha_support=1 to i915.force_probe=* but that by itself didn’t have any visible effects.

As suggested here

github.com

Qubes-Community/Contents/blob/master/docs/troubleshooting/intel-igfx-troubleshooting.md

# Intel Integrated Graphics Troubleshooting #

## Software Rendering or Video Lags

If you are experiencing this issue, you will see extremely slow graphics updates.
You will be able to watch the screen and elements paint slowly from top to bottom.
You can confirm this is the issue by looking for a line similar to the following in your `/var/log/Xorg.0.log` file:

    [   131.769] (EE) AIGLX: reverting to software rendering

Newer versions of the Linux kernel have renamed the `i915.alpha_support=1` option (which was originally called `i915.preliminary_hw_support=1`) to `i915.force_probe=*`, so if you needed this kernel option in the past you will have to rename it or add it to your configuration files (follow either GRUB2 or EFI, not both):
 * GRUB2: `/etc/default/grub`, `GRUB_CMDLINE_LINUX` line and  
   Rebuild grub config (`grub2-mkconfig -o /boot/grub2/grub.cfg`)   
 * EFI: `/boot/efi/EFI/qubes/xen.cfg`, `kernel=` line(s)

If you are unsure as to which parameter works with your kernel, check whether your kernel log from your latest boot has a message containing "i915: unknown parameter". 

## IOMMU-related issues ##

Dom0 Kernels currently included in Qubes have issues related to VT-d (IOMMU) and some versions of the integrated Intel Graphics Chip.

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