[Bug 65911] radeon: garbled output/only noise through HDMI and GPU lockups

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https://bugzilla.kernel.org/show_bug.cgi?id=65911

--- Comment #11 from tomka <tom@voodoo-arts.net> ---
In another bug report (https://bugzilla.redhat.com/show_bug.cgi?id=990986) it
was suggested to disable glx-tls during build configuration. So I replaced the
line "--enable-glx-tls" with "--disable-glx-tls". However, the GPU lock ups
still happen and I can't start X.

Then I tried setting several environment variables like it was suggested in yet
another bug report (https://bugs.freedesktop.org/show_bug.cgi?id=69728):
Neither R600_DEBUG=nohyperz, R600_DEBUG=nodma, R600_DEBUG=nosb or R600_LLVM=0
did help. Not alone and not combined.

Additionally, I removed the lines "--with-llvm-shared-libs" and
"--enable-gallium-llvm" from the ./configure parameters, because I read in bug
69728 there might be some issues with LLVM. This also didn't change anything
(the binaries got obisously much bigger, though).

The next thing I wanted to try is to disable "the new DMA ring for ttm bo
moves" like suggested by you (Alex) in another thread about GPU lockups
(https://groups.google.com/forum/#!topic/fa.linux.kernel/1_KzqknQn_U). However,
this change seems to be already in the mainline kernel.

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