Fwd: Is disabling ctrl-alt-backspace really such a good idea?

Thomas Jaeger thjaeger at gmail.com
Thu Feb 12 06:24:49 UTC 2009

John Moser wrote:
> On 2/12/09, Thomas Jaeger <thjaeger at gmail.com> wrote:
>>> Things that can happen:
>>> * Client can grab keys but hang.
>> In that case, you get the X Server back to normal by killing the client
>> and you should try and fix the client.
> Killing the client actually prevents X from having any input; you lose
> the input until you open a similar client (i.e. qemu) that regrabs,
> then close it normally so it releases.

This is not how grabs work.  If a client that has grabbed the
Keyboard/Pointer/Server is killed all grabs are automatically released.

>>> * Xorg/drivers can have a bug that locks the screen.
>> As I said before, I doubt C-A-B will help you there. Shift+SysRq+K
>> might, though.
> Happens occasionally.  Shouldn't.  It breaks X clients' ability to
> talk to the screen, doesn't update the screen, so everything waiting
> on X hangs; but X still picks up the C-A-B somehow and dies.
Bug report?

> Computers will always do very strange thnigs, most of which don't make
> sense and shouldn't happen.
Those things can be fixed though.

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