Hello Alex and und Dave, please excuse typing errors. The machine is abysmally slow with that kernel. I am almost there with bisecting Bug 16376, random - possibly Radeon DRM KM related - freezes. I think I found the merge where is issue has been introduced and I am now testing martin@shambhala:~/Computer/Shambhala/Kernel/2.6.33-2.6.34- bisect/linux-2.6> git log | head commit 6ad86c311a8b8a6d856527a1b6ba21790ab7054b Author: Alex Deucher Date: Thu Feb 11 10:47:52 2010 -0500 drm/radeon/kms: remove HDP flushes from fence emit (v2) r600_ioctl_wait_idle() now handles this. v2: update blit fence counts Unfortunately it has some other issues that has been fixed later on prior to 2.6.34 already: 7.9.2010 - 2.6.32-tp42-00514-g6ad86c3 6ad86c311a8b8a6d856527a1b6ba21790ab7054b - Sluggy desktop. Short pauses, locks of about a second. - Slow scroll performance on tty. - No complete freeze yet. - Much CPU time used in system:70-90% You know the changes in that merge better than me. Can you recommend which commits to test next? Som commits may require other ones and thus it might be wise to choose the next commits with that in mind. Maybe you already have an idea which one it could be. I thought about the memory controllr v2 changes, but I really don't have the foggiest. Here is excerpt from atop which shows ridicully high system CPU usage with that kernel. ATOP - shambhala 2010/09/07 16:11:22 10 seconds elapsed PRC | sys 8.66s | user 1.30s | #proc 195 | #zombie 0 | #exit 0 | CPU | sys 85% | user 11% | irq 4% | idle 0% | wait 0% | CPL | avg1 3.39 | avg5 3.80 | avg15 3.25 | csw 18458 | intr 11472 | MEM | tot 2.0G | free 543.1M | cache 759.6M | buff 95.0M | slab 37.8M | SWP | tot 3.8G | free 3.8G | | vmcom 1.3G | vmlim 4.8G | DSK | sda | busy 3% | read 1 | write 95 | avio 2 ms | I wrote by mail since bugzilla has too many MySQL connections again. Maybe bug can be switched to mail? Rebooting and testing this kernel another time whether it hard freezes, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7