https://bugs.freedesktop.org/show_bug.cgi?id=91375
--- Comment #2 from Alexandre Demers alexandre.f.demers@gmail.com --- (In reply to Alex Deucher from comment #1)
please attach your xorg log and dmesg output. In most cases this can be ignored if things are working properly.
Hi Alex. I'll be attaching them later today. Sorry, that was my intention but I got distracted by another bug in Xserver (it was the bug in X that allowed me to discover this error in dmesg). However, there was nothing interesting in both files from what I remember.
I'm pretty sure it was not appearing in a previous combination of mesa, ddx, drm and kernel. I could try with a previous combination. I'll begin with an older kernel.
If this error can be ignored when things are working properly, we probably shouldn't output an error. It should be at most a warning and be displayed as an error only if it fails seriously, don't you think?