Hi Simon,
Here are some details:
$ lspci|grep VGA
00:01.0 VGA compatible controller: Red Hat, Inc. Virtio 1.0 GPU (rev 01)
$ glxinfo
...
Vendor: Mesa (0x1af4)
Device: virgl (Mesa Intel(R) UHD Graphics 620 (WHL GT2)) (0x1010)
Version: 25.0.7
Accelerated: yes
Video memory: 0MB
Unified memory: no
Preferred profile: core (0x1)
Max core profile version: 4.3
Max compat profile version: 4.3
Max GLES1 profile version: 1.1
Max GLES[23] profile version: 3.2
...
$ dpkg -l|grep mesa
ii libegl-mesa0:amd64 25.0.7-2
amd64 free implementation of the EGL API -- Mesa vendor library
ii libegl1-mesa-dev:amd64 25.0.7-2
amd64 free implementation of the EGL API -- development files
ii libgl1-mesa-dri:amd64 25.0.7-2
amd64 free implementation of the OpenGL API -- DRI modules
ii libglu1-mesa:amd64 9.0.2-1.1+b3
amd64 Mesa OpenGL utility library (GLU)
ii libglx-mesa0:amd64 25.0.7-2
amd64 free implementation of the OpenGL API -- GLX vendor library ii mesa-libgallium:amd64 25.0.7-2
amd64 shared infrastructure for Mesa drivers
ii mesa-va-drivers:amd64 25.0.7-2
amd64 Mesa VA-API video acceleration drivers
ii mesa-vdpau-drivers:amd64 25.0.7-2
amd64 Mesa VDPAU video acceleration drivers
ii mesa-vulkan-drivers:amd64 25.0.7-2
amd64 Mesa Vulkan graphics drivers
Fully updated gnome-shell (48.3-1) and mutter (48.4-2).
It basically is just GNOME Boxes with 3D acceleration (via VirGL) enabled
for the VM, running on a ThinkPad T590 laptop.
Regards,
Daniel
"Control: tags -1 + moreinfo
On Thu, 24 Jul 2025 at 12:12:28 +0200,
[email protected] wrote:
The character previews in GNOME Shell Overview mode are displayed as
corrupted
and look very similar to broken textures caused by GPU memory corruption.
See
the attached screenshot.
It may be a GPU driver issue, as I am running the Debian Trixie instance in
a
virtual machine (KVM).
The same Cyrillic character previews look fine for me on real hardware
(Intel UHD Graphics 620) and in a virtual machine (virt-manager, spice,
virtio video). Identifying what is different in your VM will require
more information about the virtual hardware, and the GPU driver that is
in use by gnome-shell.
smcv
"
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<html><body><div>Hi Simon,</div><div><br></div><div>Here are some details:<br><br>$ lspci|grep VGA<br>00:01.0 VGA compatible controller: Red Hat, Inc. Virtio 1.0 GPU (rev 01)<br><br>$ glxinfo<br>...<br>Vendor: Mesa (0x1af4)<br>Device: virgl (Mesa Intel(R)
UHD Graphics 620 (WHL GT2)) (0x1010)<br>Version: 25.0.7<br>Accelerated: yes<br>Video memory: 0MB<br>Unified memory: no<br>Preferred profile: core (0x1)<br>Max core profile version: 4.3<br>Max compat profile version: 4.3<br>Max GLES1 profile version: 1.1<
Max GLES[23] profile version: 3.2<br>...<br><br>$ dpkg -l|grep mesa<br>ii libegl-mesa0:amd64 25.0.7-2
amd64 free implementation of the EGL API -- Mesa vendor library<br>ii libegl1-mesa-dev:amd64 25.0.7-2 &
nbsp; amd64 free implementation of the EGL API -- development files<br>ii libgl1-mesa-dri:amd64 25.0.7-2 &
nbsp; amd64 free implementation of the OpenGL API -- DRI modules<br>ii libglu1-mesa:amd64
9.0.2-1.1+b3 amd64 Mesa OpenGL utility library (GLU)<br>ii libglx-mesa0:amd64
25.0.7-2 amd64 free implementation of the OpenGL API -- GLX vendor library<br>ii mesa-libgallium:amd64 &
nbsp; 25.0.7-2 amd64 shared infrastructure for Mesa drivers<br>ii mesa-va-drivers:amd64 &
nbsp; 25.0.7-2 amd64 Mesa VA-API video acceleration drivers<br>ii mesa-vdpau-drivers:amd64&
nbsp; 25.0.7-2 amd64 Mesa VDPAU video acceleration drivers<br>ii mesa-vulkan-drivers:
amd64 25.0.7-2 amd64 Mesa Vulkan graphics drivers<br><br>Fully updated gnome-shell (48.3-1)
and mutter (48.4-2).<br><br>It basically is just GNOME Boxes with 3D acceleration (via VirGL) enabled for the VM, running on a ThinkPad T590 laptop.</div><div><br></div><div>Regards,</div><div>Daniel</div><div><br></div><blockquote data-email="smcv@
debian.org">Control: tags -1 + moreinfo<br><br>On Thu, 24 Jul 2025 at 12:12:28 +0200,
[email protected] wrote:<br>>The character previews in GNOME Shell Overview mode are displayed as corrupted<br>>and look very similar to broken textures
caused by GPU memory corruption. See<br>>the attached screenshot.<br>><br>>It may be a GPU driver issue, as I am running the Debian Trixie instance in a<br>>virtual machine (KVM).<br><br>The same Cyrillic character previews look fine
for me on real hardware <br>(Intel UHD Graphics 620) and in a virtual machine (virt-manager, spice, <br>virtio video). Identifying what is different in your VM will require <br>more information about the virtual hardware, and the GPU driver that is <
in use by gnome-shell.<br><br> smcv<br></blockquote></body></html>
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