It is found that the bluetooth modules with USB VID/PIDs [0a5c:219c] [0a5c:21bc] and [413c:8187] is causing random S4 hangs on various laptops with SandyBridge chipset.
The hans can be observed by repeating hibernate/resume in a 250 iterations with fwft. The successful cycles number before the han is usually ranged in tens, though it varies on different types of laptops. A major soak testing was performed across several 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 get this fixed in Debian. The patch will be attached in a follow-up mail. It added a parameter for the use as "pm-hibernate --quirk-bluetooth-service-off" and a couple of USB ID quirks I found with this S4 problem. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
