Hi,
after resuming from suspend nouveau starts writing Failed to idle
channel x (where x is 2 or 3) to the log and X appears to stop and then
restart only to stop again. Starting Firefox after resuming triggers the
bugs every time, and bisecting leads to 03bd6efa ("drm/nv50/fifo: use
hardware channel kickoff functionality").
$ grep -i nouveau .config
CONFIG_DRM_NOUVEAU=y
CONFIG_DRM_NOUVEAU_BACKLIGHT=y
# CONFIG_DRM_NOUVEAU_DEBUG is not set
Relevant part of the log (running v3.5-rc2-15-g4e3c8a1):
[ 79.040710] PM: resume of devices complete after 1952.375 msecs
[ 79.041735] PM: Finishing wakeup.
[ 79.064052] Restarting tasks ... done.
[ 79.064064] video LNXVIDEO:00: Restoring backlight state
[ 79.645442] tg3 0000:09:00.0: irq 47 for MSI/MSI-X
[ 79.707851] IPv6: ADDRCONF(NETDEV_UP): p3p1: link is not ready
[ 81.288510] tg3 0000:09:00.0: p3p1: Link is up at 100 Mbps, full duplex
[ 81.288510] tg3 0000:09:00.0: p3p1: Flow control is on for TX and on for RX
[ 81.289824] IPv6: ADDRCONF(NETDEV_CHANGE): p3p1: link becomes ready
[ 376.646417] [drm] nouveau 0000:01:00.0: PFIFO: channel 4 unload timeout
[ 378.649010] [sched_delayed] sched: RT throttling activated
[ 384.677024] [drm] nouveau 0000:01:00.0: Failed to idle channel 2.
[ 384.678012] [drm] nouveau 0000:01:00.0: PFIFO: channel 2 unload timeout
[ 389.685024] [drm] nouveau 0000:01:00.0: Failed to idle channel 3.
[ 389.686012] [drm] nouveau 0000:01:00.0: PFIFO: channel 3 unload timeout
[ 401.534024] [drm] nouveau 0000:01:00.0: Failed to idle channel 2.
[ 401.535012] [drm] nouveau 0000:01:00.0: PFIFO: channel 2 unload timeout
...
[ 456.688024] [drm] nouveau 0000:01:00.0: Failed to idle channel 3.
[ 456.689013] [drm] nouveau 0000:01:00.0: PFIFO: channel 3 unload timeout
[ 468.372025] [drm] nouveau 0000:01:00.0: Failed to idle channel 2.
[ 468.373013] [drm] nouveau 0000:01:00.0: PFIFO: channel 2 unload timeout
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