Ubuntu 23.04 - Graphics Corruption in 2023.5-beta1

[tommodev]

Issue report

Howdy, sorry couldn't get to the report issue button due to graphics bork but captured a log.

Operating system

Neofetch Dump -

OS: Ubuntu 23.04 x86_64
Kernel: 6.2.0-26-generic
Resolution: 3840x2160
DE: GNOME 44.3
WM: Mutter
WM Theme: Adwaita
Theme: Yaru-red [GTK2/3]
Icons: Yaru-red [GTK2/3]
CPU: AMD Ryzen 5 2600 (12) @ 3.400GHz
GPU: AMD ATI Radeon RX 470/480/570/570X/580/580X/590
Memory: 5993MiB / 31993MiB

App version

2023.5-beta1 installed via Deb, sourced from GH

Issue description

Mullvad Desktop is in tray, connection OK, but on opening Gui from systray all graphics within the window (excluding system border) were corrupted. Apologies didn't get screenshot.

Logfile from CLI launch of '/opt/Mullvad VPN/mullvad-gui' attached to issue. mullvad-exec-log.txt

Log seems pretty upset about shader compilation:

...
[13829:0802/185437.071501:ERROR:shared_context_state.cc(81)] Skia shader compilation error
------------------------
// Vertex SKSL
#extension GL_NV_shader_noperspective_interpolation: require
...
Errors:
link failed but did not provide an info log
[13829:0802/185437.075354:ERROR:shared_context_state.cc(81)] Skia shader compilation error
...

[faern]

Thanks for reporting this. We'll look into it before releasing this version as stable.

Can you reproduce this, or was it a single crash only?

[tommodev]

Can repo. 2 screenshots attached. Downgrading to 2023.4 and visuals are OK, upgrading to 2023.5-beta1 introduces the corruption again.

Otherwise app is "ok" and mullvad connects to server as expected.

[tommodev]

In case it's relevant, running using Ubuntu's default of Wayland, not X11.

Update, have a workaround: searching for similar issues with chrome based apps, workaround is to delete the shader cache for Mullvad. Based on:

https://github.com/brave/brave-browser/issues/30179#issuecomment-1560048396

Can confirm it works: I rm -rf'ed the Mullvad dir (sorry, brute force compared to isolating the shader dir but short on time :sweat_smile:), re-installed 2023.5-beta1, and the graphics are working fine.

[faern]

Thank you for finding a workaround. That can surely be very helpful when we dig into this issue.

[raksooo]

We've added automatic removal of the GPU cache dir on upgrade so this should be fixed when it's released.