[alsa-devel] snd-hda-intel runtime PM fail after module reload

[Ville Syrjälä]

Hi,

My investigation into some sporadic i915 runtime PM failures seem to
point the finger at snd-hda-intel.

I just tried to play around unloding and reloading snd-hda-intel and
sometimes I get snd-hda-intel loaded with runtime PM supposedly enabled,
but actually the device won't runtime suspend. At which point frobbing
with power/control is enough to kick it back into submission.

# for i in `seq 1 3`; do sleep 1 ; grep . /sys/bus/pci/devices/0000\:00\:03.0/power/*  ; done
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:117045
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:suspended
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:222657
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:117045
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:suspended
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:223666
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:117045
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:suspended
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:224674
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
# rmmod snd-hda-intel
# modprobe snd-hda-intel
# for i in `seq 1 3`; do sleep 1 ; grep . /sys/bus/pci/devices/0000\:00\:03.0/power/*  ; done
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:121454
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:active
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:228560
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:122463
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:active
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:228560
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:123472
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:active
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:228560
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
# echo on > /sys/bus/pci/devices/0000:00:03.0/power/control
# echo auto > /sys/bus/pci/devices/0000:00:03.0/power/control
# for i in `seq 1 3`; do sleep 1 ; grep . /sys/bus/pci/devices/0000\:00\:03.0/power/*  ; done
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:141459
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:suspended
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:231699
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:141459
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:suspended
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:232706
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0
/sys/bus/pci/devices/0000:00:03.0/power/async:enabled
grep: /sys/bus/pci/devices/0000:00:03.0/power/autosuspend_delay_ms: Input/output error
/sys/bus/pci/devices/0000:00:03.0/power/control:auto
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_kids:0
/sys/bus/pci/devices/0000:00:03.0/power/runtime_active_time:141459
/sys/bus/pci/devices/0000:00:03.0/power/runtime_enabled:enabled
/sys/bus/pci/devices/0000:00:03.0/power/runtime_status:suspended
/sys/bus/pci/devices/0000:00:03.0/power/runtime_suspended_time:233713
/sys/bus/pci/devices/0000:00:03.0/power/runtime_usage:0

-- 
Ville Syrjälä
Intel OTC