linux-kernel - Re: Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently

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Message-ID: <alpine.DEB.2.20.2512101433240.24105@mail.home>
Date: Wed, 10 Dec 2025 14:36:23 +0200 (EET)
From: Timo Lindfors <timo.lindfors@....fi>
To: Salvatore Bonaccorso <carnil@...ian.org>
cc: Matt Marjanovic <maddog@....com>, 1054514@...s.debian.org, 
    Maxime Ripard <mripard@...nel.org>, 
    Alex Constantino <dreaming.about.electric.sheep@...il.com>, 
    airlied@...hat.com, daniel@...ll.ch, dri-devel@...ts.freedesktop.org, 
    kraxel@...hat.com, linux-kernel@...r.kernel.org, 
    maarten.lankhorst@...ux.intel.com, regressions@...ts.linux.dev, 
    spice-devel@...ts.freedesktop.org, timo.lindfors@....fi, 
    tzimmermann@...e.de, virtualization@...ts.linux-foundation.org
Subject: Re: Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl
 graphics freezes frequently

On Tue, 9 Dec 2025, Salvatore Bonaccorso wrote:
>> This is back in trixie --- unsurprisingly, because the kernel commit which

Indeed. The reverst of the problematic commit was reverted in mainline 
kernel. I have spent several days trying to understand the problem but 
unfortunately I don't have enough time to troubleshoot this more.

I tried switching to virtio but for my use case of remote Linux desktops 
it is not usable. If I scroll a fullscreen web page I can see how the 
whole screen is redrawn every time,

Meanwhile I've switched from SPICE to RDP. GNOME in trixie supports 
headless RDP sessions that make this very convenient. Client support is 
also much better for RDP. I solved the authentication problem by isolating 
each VM from each other on network level and then deployed rdpgw 
(https://github.com/bolkedebruin/rdpgw) in front of everything with OpenID 
authentication.

-Timo