[Bug 592042] Re: [Maverick only] Pressing printscreen hangs keyboard

[Mikkel Munch Mortensen]

I'm experiencing this too. I did some testing and it seems it only
happens when a window is active. If I have no windows, only the desktop
shown, this does not happen. But when I open a window and press Print
Screen, keyboard stops working. Then the top/bottom panels flicker
(sometimes disappears) and window decorations disappear. After a little
while, the computer shuts down.

Initially I thought it was related to X or something like that, but
maybe it's the SysRq thing?

I was about to file a new bug about this via Apport (but then I decided
to ask The Google before submitting anything). Somewhere in the steps,
it gave me the following to submit:

BUG: unable to handle kernel NULL pointer dereference at 00000008
IP: [<c03e4175>] fb_release+0x25/0x60
Call Trace:
 [<c021abaf>] ? __fput+0xdf/0x1f0
 [<c021acdd>] ? fput+0x1d/0x30
 [<c02175cc>] ? filp_close+0x4c/0x80
 [<c0217675>] ? sys_close+0x75/0xc0
 [<c05cdc1c>] ? syscall_call+0x7/0xb
Code: bc 27 00 00 00 00 55 89 e5 83 ec 08 89 1c 24 89 74 24 04 0f 1f 44 00 00 8b 5a 70 8d 73 08 89 f0 e8 41 83 1e 00 8b 83 0c 03 00 00 <8b> 48 08 85 c9 74 0f ba 01 00 00 00 89 d8 ff d1 8b 83 0c 03 00 
EIP: [<c03e4175>] fb_release+0x25/0x60 SS:ESP 0068:f4deff3c
CR2: 0000000000000008

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[Maverick only] Pressing printscreen hangs keyboard
https://bugs.launchpad.net/bugs/592042
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