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atheros bt failed after S3
Status in HWE Next:
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
BT fails to load firmware after S3. On my system it's atheros' chip, but the
same issue can be seen with broadcom's chip, too.
[542.6274] WARNING: CPU: 0 PID: 20729 at
The root cause of this issue is request_firmware() is being called at
the wrong time.
The fix is from this old thread, but the patch didn't be accepted by the
It prevents the work queue from being re-created and calls request_firmware()
immediately before usermodehelper is fully resumed. Making the workqueue
freezable preserves the delay and will postpone the firmware loading time.
Verified on the machine has this issue, and confirm this patch works.
From what I can see, I think this change should be safe, and after 240 times
S3 test, the system and BT functions are still working.
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