** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1706833
Title:
atheros bt failed after S3
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
New
Bug description:
[Impact]
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
/build/linux-MD8jsN/linux-4.4.0/drivers/base/firmware_class.c:1148
_request_firmware+0x7c2/0xaf0()
The root cause of this issue is request_firmware() is being called at
the wrong time.
[Fix]
The fix is from this old thread[1], but the patch didn't be accepted by the
maintainer.
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.
[Test Case]
Verified on the machine has this issue, and confirm this patch works.
[Regression Potential]
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.
1. http://lists.openwall.net/netdev/2015/05/06/3
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