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Bug#1109676: linux-image-6.12.35+deb13-amd64: Regression in host kernel breaks VM VFIO graphics

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  Bug#1109676: linux-image-6.12.35+deb13-amd64: Regression in host kernel breaks VM VFIO graphics Salvatore Bonaccorso <carnil@debian.org> - 2025-07-23 15:50 +0200

#88509 — Bug#1109676: linux-image-6.12.35+deb13-amd64: Regression in host kernel breaks VM VFIO graphics

Hi Jonathan,

On Mon, Jul 21, 2025 at 08:42:50PM +0100, Jonathan wrote:
> Package: src:linux
> Version: 6.12.35-1
> Severity: normal
> Tags: upstream
> X-Debbugs-Cc: debian-amd64@lists.debian.org, jonathan@unbiased.name
> User: debian-amd64@lists.debian.org
> Usertags: amd64
> 
> Dear Maintainer,
> 
> I run desktop with iGPU and can start qemu VM(s) with a A750.
> It worked (reasonably) for few years and runs with 6.12.33 kernel.
> See start of VM boot (efi gop)
> Windows 11 guest now starts and power saves monitor. Device has problem code
> 43. Can ssh.
> A debian testing guest sticks to blank with cursor, from gdm, without being
> able to switch VT. Newest testing kernel fine inside with old host kernel. ssh
> in fine.
> 
> Not fixed in 6.12.39 source.
> Bisected to;
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.12.y&id=fb5873b779dd5858123c19bbd6959566771e2e83
> 
> I also wonder if bugs #1109116 and #1109203 could be from same. Although I can
> still boot host onto card so not necessarily matching.

thanks for pinpointing the introducing commit. Can you report the
regression yourself to upstream and report back here the upstream
report or do you need help with that?

Include the regressions and stable list as well in the report, in
addtion to the involved maintainers and persons of the breaking
commit.

Regards,
Salvatore

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