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.