Here is how I ask the multisampled framebuffer: GLint visual_attribs[] = {…, GLX_SAMPLE_BUFFERS, 1, GLX_SAMPLES, 4, …} glXChooseFBConfig(…, visual_attribs, …) This sample code works properly on standalone Xorg, on the exact same configuration. Mesa 11.2.0_devel commit 3e8f644 (I can reproduce on 11.1.0), Xorg 1.18.0, on an up to date ArchLinux.
Proposed fix for this: https://gitlab.freedesktop.org/xorg/xserver/merge_requests/195
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