Perhaps this should be put into a Wiki or a FAQ: (however it could be a pain to maintain it I guess).
Anyway, for whom it might be of interest here it is: Things that are known to be broken or not yet supported in the latest (2.6.12-rc6-pa1) linux/PA kernel: - NTPL is not yet supported (being worked on) - kernel low-latency/preempt is not yet supported - 64bit userland is not yet supported - SMP, expecially on 64bit kernels seems to be rather unstable - on some machines heavy I/O can cause problems - XFS used to/is still broken - ide-cd causes HPMC on cd-rom access; use ide-scsi instead - Using native XFree86 drivers may cause HPMC, try to use fbdev instead - Using fbdev with XFree86 causes HPMC on 64bit kernels - To use onboard sound on B/C/Jxxxx use the snd_ad1889 ALSA driver, with OSS Emulation (native ALSA interface seems to have problems) Please correct me if something has changed recently; I guess some of the PA kernel hackers (and also users) might want to add a few things to this list ;) Max PS: sorry for cross-posting
