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gpui: Provide workaround for AMD Linux driver bug (#26890)

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There apparently is some amdgpu/radv bug that rendering with
multisample anti-aliasing (MSAA) results in a crash when the bounds
of a triangle list exceed 1024px, which in Zed happens with the default
buffer font size when you select a line with more than 144 characters.

This crash has been reported as #26143.

This commit introduces a workaround: you can set the
ZED_PATH_SAMPLE_COUNT=0
environment variable to disable MSAA and the error message we print
when a GPU crash is encountered with radv now suggests trying this
environment
variable as a workaround and links the respective issue.

Sidenote: MSAA was introduced in
f08b1d78ec
so you didn't run into this driver bug with versions < 0.173.8.

Release Notes:

- Added a workaround for an AMD Linux driver bug that causes Zed to
crash when selecting long lines.
This commit is contained in:
Martin Fischer 2025-03-18 21:11:09 +01:00 • committed by GitHub
parent 48fe134408
commit 4a39fc2644
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2 changed files with 24 additions and 6 deletions
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docs/src/linux.md
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@ -111,6 +111,7 @@ On some systems the file `/etc/prime-discrete` can be used to enforce the use of
On others, you may be able to the environment variable `DRI_PRIME=1` when running Zed to force the use of the discrete GPU.
If you're using an AMD GPU and Zed crashes when selecting long lines, try setting the `ZED_PATH_SAMPLE_COUNT=0` environment variable. (See [#26143](https://github.com/zed-industries/zed/issues/26143))
If you're using an AMD GPU, you might get a 'Broken Pipe' error. Try using the RADV or Mesa drivers. (See [#13880](https://github.com/zed-industries/zed/issues/13880))
If you are using Mesa, and want more control over which GPU is selected you can run `MESA_VK_DEVICE_SELECT=list zed --foreground` to get a list of available GPUs and then export `MESA_VK_DEVICE_SELECT=xxxx:yyyy` to choose a specific device.