<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<br>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 amd64 free implementation of the EGL API -- development files<br>ii libgl1-mesa-dri:amd64 25.0.7-2 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 25.0.7-2 amd64 shared infrastructure for Mesa drivers<br>ii mesa-va-drivers:amd64 25.0.7-2 amd64 Mesa VA-API video acceleration drivers<br>ii mesa-vdpau-drivers:amd64 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, asciiwolf@seznam.cz 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
<br>in use by gnome-shell.
<br>
<br> smcv
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