[Bug 642792] Re: ALT+PrtSc not recognised

[Leann Ogasawara]

>From a kernel perspective, this appears to be expected behavior.  By
default, SysRq handling is enabled in the kernel.  Thus by pressing
Alt+PrintScreen it is correctly being interpreted as the SysRq key.  As
Alan Pope noted, if he disables SysRq handling in the kernel,
Alt+PrintScreen can then be used to capture a screenshot of the
currently selected window.  There seems to be a few solutions one could
propose:

1) Disable SysRq handling by default.  This is a simple 1 line change by adding "kernel.sysrq = 0" to /etc/sysctl.conf .  Those then wanting to enable SysRq handling can do so by either "echo 1 > /proc/sys/kernel/sysrq" or "sysctl -w kernel.sysrq=1"
2) Reassign the keyboard shortcut to capture a screenshot of the currently active window to something other than Alt+PrintScreen, eg. use Ctrl+PrintScreen or something.
3) Regress expected kernel behavior to not interpret Alt+PrintScreen as SysRq when SysRq handling is enabled.  I personally don't feel this is the correct solution.

I think option 1 seems to be the most reasonable solution.

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ALT+PrtSc not recognised
https://bugs.launchpad.net/bugs/642792
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