On Wed, Nov 10, 2010 at 2:28 PM, Andrew Lutomirski <andy@xxxxxxx> wrote: > Hi all- > > Somewhere between 2.6.34-fedora-whatever and 2.6.36, Nouveau became > extremely broken on my hardware. It appears to be triggered by a bug > in my monitor (HP LP2475w), which causes the monitor to disappear from > DVI when it goes to sleep. Every time the console blanks (in X or > otherwise AFAICT) the system crashes oddly but unrecoverably. This is > 100% reproducible by Ctrl-Alt-F2 followed by 'echo 1 >>/sys/class/graphics/fb0/blank' *from SSH* and waiting a few seconds > for the monitor to go to sleep, but it also happens if I just walk > away from the computer long enough for it to blank itself. This is > present on F14's kernel and on 2.6.36 from kernel.org. This may or > may not be related to the unreproducible crashes that I used to get > rarely on 2.6.34. > > The best hint I have is from this patch (sorry for whitespace damage): > > > which spews "nv50 got hpd irq" once the display blanks. I tracked it down. The interrupt code in 2.6.36 is totally broken --- it acknowledges the interrupt *in the bottom half*. This might work by accident if the bottom half gets queued on a different CPU, but something probably changed (concurrency-managed workqueues?) that make the BH end up on the same cpu. So the cpu starves the BH and there goes a cpu. Then the clocksource watchdog hits and takes the whole system down when it calls stop_machine, which also gets starved on that cpu. Patch coming. --Andy _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
