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 "
