F11: xorg decision to disable Ctrl-Alt-Backspace

[Casey Dahlin]

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Adam Jackson wrote:
> On Tue, 2009-03-31 at 10:51 -0400, Colin Walters wrote:
>> 2009/3/31 Adam Jackson <ajax at redhat.com>:
>>> So let's list the cases that zap would actually recover from:
>>>
>>> 1: stuck grabs
>>> 2: focus reverts to None and your window manager is dead
>>> 3: X driver that's decided to stop rendering (or stop rendering
>>> correctly)
>> Let me add:
>>
>> 4: Randr configuration is either broken or out of date, and the system
>> didn't detect it correctly
>>
>> More than a few times now I've forgotten I had set up an external
>> monitor, suspended, and unsuspended later and faced with a black
>> screen thought my machine had locked.  Of course this is a system bug,
>> but then all of these things are.
> 
> Yeah, this is hard.
> 
> Part of the problem here is that the X server doesn't really have a good
> way of knowing when a suspend happens.  For UMS drivers, we vt-switch
> and hope that works, but that means you can't distinguish normal vt
> switch from suspend.  Maybe you always want to do an output rescan at vt
> enter?  Maybe not.  Maybe just rescan and send config change events to
> the desktop, but not actively change the topology.
> 
> For KMS drivers, we suspend in place now, which is pretty awesome since
> it eliminates flicker on the way down and on the way back up.  So the
> kernel driver ought to be smart enough to send configuration changes
> back through a uevent.  I don't think we're doing anything with those
> events yet though.
> 

If X simply knew it was in an inconsistent state, could it initiate
recovery from there? It'd be nice if we could have a simple
/usr/bin/xreconfig so we could add this to the "easy fix from vt" cases.

- --CJD
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