Affects me as well, couldn't yet determine the cause either. It seems as if it
sometimes locks itself while normal use.
I have to note though that sometimes other keys lock up as well, namely Alt or
the arrow keys. However those can be unlocked by double-tapping the problematic
key. But not for
Backtrace:
[ 29851.244] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b]
[ 29851.244] 1: /usr/bin/X (0x8048000+0x5fac8) [0x80a7ac8]
[ 29851.244] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x69340c]
[ 29851.245] 3: /usr/bin/X (_CallCallbacks+0x3e) [0x8074e1e]
[ 29851.245] 4: /usr/bin/X (WriteToClient+0x2
