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0e1f616
(Get the code!)
Binary package hint: pm-utils
It is found that the bluetooth modules with USB VID/PIDs [0a5c:219c] and [0a5c:21bc] is causing random S4 hangs on various Dell laptops with SandyBridge chipset.
The hangs can be observed by repeating hibernate/resume in a 250 iterations with fwts. The successful cycles number before the hang is usually ranged in tens, though it varies on different types of Dell laptops.
A major soak testing was performed across several Dell SandyBridge laptops installed with Ubuntu Maverick.
The hang can be worked around to stop the bluetooth service before the hibernate and restart it in the resume in the testing.
This bug is an attempt to make the workaround look better in the shape and more suitable for the SRU in Maverick.
The plan is to add the quirk support for bluetooth (with USB IDs as above), which is currently lacking in pm-utils.
Natty is not yet soak-tested. However, if the bug is also found present there later, the fix shall also go there or upstream.