Need help to dig into X11 display freezing (Renoir, Xen/QubesOS)

[Alex Deucher]

On Sun, Jul 20, 2025 at 10:39 AM Yann Dirson <ydirson at free.fr> wrote:
>
> Hello there,
>
> For a few months I've been experiencing occasional freezes of the X11 display
> on my QubesOS RENOIR laptop.  The setup is pretty much standard for QubesOS,
> with both GPUs attached to dom0 and XFCE running there (and the dGPU being
> mostly not used).  Kernel is QubesOS' kernel-latest-6.15.4.
>
> Those freezes most often occur while the screen is blanked
> by xscreensaver (suspend options fully deactivated here, as suspend is broken
> on this platform): in this case moving the mouse does not get the unlock banner
> displayed, the screen stays black... except the mouse pointer is visible.  I can
> also switch to other virtual consoles and interact with the system, but was
> never able to collect any evidence of something wrong being detected.
>
> Occasionally it also happens (like yesterday) while I'm working, and the X11
> display just seems frozen, no clue if the input devices trigger anything in
> there.
>
> I guess something goes wrong but gets undetected by the driver.  Any suggestion
> as to extra logging/debug features to enable?

Is this specific to QubesOS or a general problem even on bare metal?

Alex