(In reply to comment #5)
> It hangs at calibrating now:
> 
> ~ $ R600_DEBUG=cs pyrit benchmark
> Pyrit 0.4.0 (C) 2008-2011 Lukas Lueg http://pyrit.googlecode.com
> This code is distributed under the GNU General Public License v3+
> 
> Calibrating... ^CTerminato
> 
> Where should I find the output of R600_DEBUG=cs? There is nothing even in
> dmesg.

This bug was filed against Evergreen/NI GPUs.  If you are using SI, you will
need to use RADEON_DUMP_SHADERS=1

Otherwise, R600_DEBUG=cs will print output to stderr.