screen unblanking problem in qemu

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hello,

i have problems with unblanking in console and x11 in qemu based
hypervisors.

the screen does not unblank as a whole on mouse move or when typing to
console.

https://gitlab.com/qemu-project/qemu/-/issues/2067
https://bugzilla.proxmox.com/show_bug.cgi?id=4786

first stumbled on this in debian 12 installer, and since then, it
rendered quite some installations unusable, as you get stuck when you
can't refresh the screen anymore.

it's a little bit weird that nobody seems to complains besides me, but i
can easily reproduce this on debian 12.

going back to kernel 5.15 does not show the problem, as there is no
screenblanking support in there.

not sure if this is related to the builtin vnc in qemu/proxmox or if
it's the driver itself. but it's annoying, as you cannot leave debian
installation alone for a while, as you need start from scratch after
blanking.

regards
roland
sysadmin



https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/MAINTAINERS?h=v6.8-rc2

DRM DRIVER FOR BOCHS VIRTUAL GPU
M:    Gerd Hoffmann <kraxel@xxxxxxxxxx>
L:    virtualization@xxxxxxxxxxxxxxx
S:    Maintained
T:    git git://anongit.freedesktop.org/drm/drm-misc
F:    drivers/gpu/drm/tiny/bochs.c


there has been blanking added here:
https://lists.freedesktop.org/archives/dri-devel/2021-April/303933.html

and there was this fix
https://lists.freedesktop.org/archives/dri-devel/2022-September/370781.html






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