Most recent kernel where this bug did *NOT* occur: there's no kernel without this bug Distribution: openSUSE 10.2, mandriva 2007 Hardware Environment: Asus Z9252Va, but this affects most Asus Notebooks (and some others (sony vaio) Software Environment: Problem Description: The notebooks are really slow when they are plugged in. When they're running on battery there's no problem with performance... but when you plug them in again the performance decreases rapidly... we've found a solution on the linux-club forum: http://www.linux-club.de/viewtopic.php?p=456891#456891 the failure is because of the smp kernel which is integrated into the kernel, and so the notebooks choose a false mode for it.. when you deactivate smp in the kernel and compile it new the problem is solved.. so maybe there's a possibility to detect whether it's an asus notebook and therefore deactivate smp. Steps to reproduce: everytime (during boot, work, simply everytime)
*** Bug 8194 has been marked as a duplicate of this bug. ***
This could have to do with machine not waking up from C2 state? Normally this should happen if running on battery, but maybe it's the same problem. Does it work if you pass the boot param: processor.max_cstate=1 If yes, it's that and it should be fixed in latest kernels. People stated that it got fixed with a 10.2 upgrade kernel, so it's likely that. -> I'll try to close this one, please reopen if anyone still sees the problem.
Already fixed in kernel (should be a patch from Thomas Gleixner), using broadcast timer in drivers/acpi/processor_idle.c (for machines supporting C2/C3 processor states (not sure whether all use broadcast timer or only specific Pentium M in the end)) -> setting to fixed and closed.