(All as root..) echo 1 > /sys/kernel/debug/tracing/events/hda/enable hda-verb /dev/snd/hwC1D0 0x25 GET_PIN_SENSE 0 nid = 0x25, verb = 0xf09, param = 0x0 value = 0x80000000 suspend/resume.. bug is triggered on the first attempt.. hda-verb /dev/snd/hwC1D0 0x25 GET_PIN_SENSE 0 nid = 0x25, verb = 0xf09, param = 0x0 value = 0x80000000 cat /sys/kernel/debug/tracing/trace > trace.log echo 0 > /sys/kernel/debug/tracing/events/hda/enable