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In XUbuntu 12.04 I'm facing an issue where (occasionally) the keyboard lay-out is changed after resuming from suspend to RAM. As this only happens sporadically, I haven't figured out what causes it (yet). However, a solution when it does happen is quite simple:

setxkbmap -rules evdev -layout us -model pc105

This fixes the keyboard map, but for some reason my up arrow remains unresponsive in X. The key is only unresponsive in the X session, when switching to e.g. TTY6 the up arrow works fine. This the output I get when running xev and pressing the up arrow:

FocusOut event, serial 32, synthetic NO, window 0xa600001, mode NotifyGrab, detail NotifyAncestor

FocusOut event, serial 32, synthetic NO, window 0xa600001, mode NotifyUngrab, detail NotifyPointer

FocusIn event, serial 32, synthetic NO, window 0xa600001, mode NotifyUngrab, detail NotifyAncestor

KeymapNotify event, serial 32, synthetic NO, window 0x0, keys: 4294967247 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

I'd guess XFCE has bound the up arrow to something else, however I can't figure out what it is as it doesn't show in the keyboard settings nor in the windowmanager settings. xfce4-settings-editor doesn't show anything suspicious either. I'm running Xfce 4.10

Any thoughts?

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Have you installed 'ibus' package? Apart from 'ibus' there are other packages that may prove to be helpful for keyboard and mouse related issues. Just look for them with Synaptic Package Manager using 'keyboard' as search entry. –  Taz D. Apr 1 at 9:54

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