Version: 48.0-1




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).

Control: tags -1 + moreinfo

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

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
corrupted
See
a

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
"