I have installed Qubes OS on a new laptop. Immediately after installing, I
decided to run qubes-dom0-update and then also qubes-dom0-update
--enablerepo=qubes-dom0-security-testing in order to patch recent Xen
vulnerabilities.
Before reboot, Qubes worked smoothly. After reboot, the GUI is quite lazy –
mouse movement is slooow, typing lag is high (so I prefer tty over xfce
-terminal for performance reasons) etc. I haven't measured the lag exactly, but
it can be about 1s.
So, I have looked at /var/log/Xorg.0.log. There are few errors, the first one
seems to be the root cause:
open /dev/dri/card0: No such file or directory
(I have retyped it, because it would be painful to copy&paste it.)
Others are about GPU fallbacks and also “AIGLX: reverting to software
rendering”.
So, my reconstruction is that /dev/dri does not exist and thus it to use HW
acceleration and thus it is so slow. It makes sense, except that I don't know
why /dev/dri is missing. It is reportedly created by kernel, so I assume it is
related to i915 module and/or newer kernel version.
When I run lsmod | grep i915, it shows it is loaded. But it is apparently not
used, because I can rmmod it. I have tried to reinstall GPU drivers package,
but it did not help.
My other idea was to boot Qubes with the old kernel. But I don't know how to do
it with UEFI boot. With Legacy boot, there is a Grub menu where I can choose an
old kernel, edit kernel cmdline etc. With UEFI boot, I can see nothing like it.
Just when I press F12 in early boot stage, I can select what to boot, but I can
select just Qubes here, without any options.
What to do now?
Configuration:
* Dell Inspiron 15Z Touch 5578
* Intel i7-7500U CPU
* No dedicated GPU (I hoped to have less issues when I have just the integrated
one…)
* UEFI boot.
Regards,
Vít Šesták 'v6ak'
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