https://bugs.freedesktop.org/show_bug.cgi?id=100465
--- Comment #7 from Julien Isorce julien.isorce@gmail.com --- (In reply to joro-2013 from comment #4)
I've noticed the same difference on my ancient mac mini G4 with a humble RV280 GPU. I try to boot it in AGP mode from time to time after applying some patches, just for fun. Before i would see some GPU lockup-resetting stuff (it always locks up after some time and never recovers) in kern.log, lately it just locks up and there's nothing in the logs.
The patches i applied lately were
[PATCH] radeon: allow write_reloc with unaccounted buffers to cope with Mesa bug
https://patchwork.kernel.org/patch/4663071/
and
drm-radeon-fix-TOPDOWN-handling-for-bo_create-v3.patch
https://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg132931.html
My guess would be patch number two.
Thx for the note, but it looks like the 2 patches you pointed (first one for libdrm) and second one (https://cgit.freedesktop.org/~agd5f/linux/commit/?h=topdown-fixes&id=db0... for kernel) were never merged so it cannot not affect my usecase.