Only `llvmpipe` is detected as GPU backend on latest release

[bkchr]

I build the latest release with the experimental mesa GPU driver, but only llvmpipe is detected as backend. Anyone seen this issue as well?

[bkchr]

Looks like the Asahi kernel module isn't build 🤔

[asdrubalini]

I also have this issue I think. Sway has been super laggy since yesterday. Haven't yet checked if it's using llvmpipe though, but I highly suspect.

[bkchr]

Yeah, my KDE is also super laggy, so probably the same! I didn't yet figure out why the module isn't build.

[bkchr]

Okay, I found the commit that broke it: https://github.com/NixOS/nixpkgs/commit/e999433b3a169306e752d6732527db8dc78e142c

Reverting this commit fixes it for me. Now I need to find out why it breaks.

[asdrubalini]

Thanks! For anyone wondering, using the pinned nixpkgs version from this repo works fine (since it is pinned to a commit before the offending one). Now that I have a usable system I'm going to debug too.

[bkchr]

When commenting out this line it works again. I don't get what oldconfig is doing there :shrug:

[fl0werpowers]

Given that this issue is solved via changing something upstream, perhaps it should be raised upstream as well? or should it be fixed in the experimental kernel config instead? i don't really understand what's the path towards dealing with this issue

[QuentinI]

The reason asahi driver is not built is a faulty script in kernel source. By adding this patch to kernelPatches I'm able to make kernel build with Rust support, but unfortunately build fails because of a reference cycle. Probably something like https://github.com/NixOS/nixpkgs/issues/225756, which also surfaced after https://github.com/NixOS/nixpkgs/pull/221707

diff --git a/scripts/rust_is_available.sh b/scripts/rust_is_available.sh
index aebbf1913..b7b0a4abc 100755
--- a/scripts/rust_is_available.sh
+++ b/scripts/rust_is_available.sh
@@ -102,8 +102,7 @@ fi
 # Check that the `libclang` used by the Rust bindings generator is suitable.
 bindgen_libclang_version=$( \
    LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null \
-       | grep -F 'clang version ' \
-       | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
+       | grep -oP 'clang version \K[0-9]+\.[0-9]+\.[0-9]+' \
        | head -n 1 \
 )
 bindgen_libclang_min_version=$($min_tool_version llvm)

[QuentinI]

Gottem Not sure it's merge-able, but at least it works