Well I'm on stock ota ics 4.0.3. Just your kernel when this happened I was just downloading SD data for n.o.v.a 3. Happened every time the screen timed out. It also happened on a multiple file transfer from internal to SD when I did the dirty swap for more space. Would maybe switching the governor for screen off fix this? To like on demand or interactive. To get a logcat I would need to replicate the problem using adb correct? Never actually did one before. I don't have anything special installed only large files are games. That's pretty much what I use it for along with internet.
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You don't usually want to change the governor for screen off vs screen on, I've seen it cause alot of issues. If you must create a screen off profile, leave the governor the same as your normal governor. Some you can do it with, but its hit and miss, easier to just leave it alone.