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I have a HP elite 8200 desktop in dual seat setup (i5 processor, 8G ram, 2x Radeon HD6450 graphics using 'radeon' driver). It runs ubuntu 12.04 64bit and uses udev for selecting input devices for each seat. It mostly works fine, although occasionally X crashes and refuses to start during boot (another restart usually helps).
However, occasionally (about once a month) when keyboard of the seat 1 is under active use, the computer shuts down. The only somewhat relevant stuff from the logs was in X log for seat 1 (Xorg.1.log.old):
[1727096.965] (II) XKB: reuse xkmfile /var/lib/xkb/server-9D162EA1B376467B416CA78A93335F1F745AD174.xkm
[1728305.102] (II) XKB: reuse xkmfile /var/lib/xkb/server-3E90985BC446F3A94AC39BAC9D64837FE8F3A877.xkm
[1732168.896] (II) evdev: Power Button: Close
[1732168.896] (II) UnloadModule: "evdev"
[1732168.896] (II) Unloading evdev
[1732168.936] (II) evdev: Power Button: Close
[1732168.936] (II) UnloadModule: "evdev"
[1732168.936] (II) Unloading evdev
[1732168.980] (II) evdev: UVC Camera (046d:09a1): Close
[1732168.980] (II) UnloadModule: "evdev"
[1732168.980] (II) Unloading evdev
[1732169.012] (II) evdev: CHICONY HP Basic USB Keyboard: Close
[1732169.012] (II) UnloadModule: "evdev"
[1732169.012] (II) Unloading evdev
[1732169.064] (II) evdev: Logitech USB-PS/2 Optical Mouse: Close
[1732169.064] (II) UnloadModule: "evdev"
[1732169.064] (II) Unloading evdev
[1732169.128] (II) evdev: HP WMI hotkeys: Close
[1732169.128] (II) UnloadModule: "evdev"
[1732169.128] (II) Unloading evdev
[1732169.128] ddxSigGiveUp: Closing log
[1732169.128] Server terminated successfully (0). Closing log file.
(the two first lines are probably not related).
Any ideas? Myself, I suspect it is some kind of misunderstanding between BIOS and the graphics cards, which occasionally overspills in this way. However, perhaps it can also be a faulty keyboard?
Is it possible to disable shutdown through "evdev" driver?
Extremely unlikely. First, the users have mentioned only DEL, not any more complex combinations (but sometimes they do not conot confirm even that). Second, CTR-ALT-BS does not do anything under normal operation (neither does CTL-ALT-DEL). Third, computer will be shut down, not just X restarted.
The keyboard does not have any power down button. I guess it is possible to tweak the driver a bit?
after a long testing period it seems the issue was as follows:
a) the keyboard was broken, occasionally sending ctrl-alt-del instead of del.
b) ctrl-alt-del was not disabled.
I replaced the keyboard, and disabled ctr-alt-del, and haven't experienced any problems ever since :-)