Subject: [PATCH core-updates] gnu: mesa: Re-enable X11 protocol support for the DRI2 extension.

From: Philipp Berger <[email-masked]>
Date: Sun, 13 Jul 2025 06:06:45 +0200

Starting with Mesa 24.3, X11 protocol support for the DRI2 extension is
no longer enabled by default.  The developers are phasing it out in
favor of DRI3, and have moved it into an optional 'legacy-x11' feature.
Re-enable it to retain hardware acceleration on older systems that do
not support DRI3.

* gnu/packages/gl.el (mesa)[arguments]<#:configure-flags>: Add
'-Dlegacy-x11=dri2'.
---
 gnu/packages/gl.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gnu/packages/gl.scm b/gnu/packages/gl.scm
index a23426fd42..b5be8346b9 100644
--- a/gnu/packages/gl.scm
+++ b/gnu/packages/gl.scm
@@ -428,6 +428,9 @@ (define-public mesa
          ;; Also enable the tests.
          "-Dbuild-tests=true"
 
+         ;; Re-enable X11 protocol support for the DRI2 extension.
+         "-Dlegacy-x11=dri2"
+
          "-Dllvm=enabled")              ; default is x86/x86_64 only
 
        ;; XXX: 'debugoptimized' causes LTO link failures on some drivers.  The

base-commit: d31a92c6242145724783b692941545384fd71bc4
-- 
2.50.1