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Subjectkernel panic when plugging in USB device and closing lid
My HP Compaq 2510p laptop regularly locks up after I move away from my
desk and then return, plug in my USB keyboard and close the lid. I've
now found an easy way to reproduce this:

- Boot in single user mode
- Plug in a USB device (e.g. keyboard or usb stick)
- Close the lid
- Open the lid and you see a kernel panic like this (written down by hand):

BUG: unable to handle kernel <1>BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
IP: [<ffffffff8024949f>] ktime_get_ts:0x17/0x48
PGD 7cceb067 PUD 7cd19067 PMD 0
Oops: 0000 [1] SMP
Module linked in: ...
... lots of register info ...
Process swapper (pid: 0, threadinfo fffff81007f3bc000, task ffff81007f3b40c0)

RIP [<ffffffff8024949f>] ktime_get_ts+0x17/x048
RSP <ffff81007e88fb90>
CR2: 0000000000000000
---[ end trace dd6b99ae04431d83 ]--
Kernel panic -- not syncing: Attempted to kill the idle task!

This is with 2.6.25. 2.6.26-rc5 looks slightly different. Screen shots:

I briefly talked to Matthew Garrett on IRC who said this "looks like
state corruption". He asked me to set /proc/acpi/video/blah/DOS to 7
and see whether I could still reproduce the problem. After setting
this value, I no longer see the kernel panic. Matthew: "Right. The
lid-close SMM seems to blow things up some of the time."

Does anyone have any idea what's going on and how to fix it?

Martin Michlmayr

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