I can confirm that the crash depends on the fn-f8 combo to activate/disable the 
touchpad. 
The  interesting thing is that it doesnt matter if the touchpad is actually 
active or not.  If I disable/enable the touchpad via terminal [synclient 
touchpadoff=1/0] it doesnt crash as long as the touchpad isn't deactivated via 
fn-f8.
I'm usually using the trackpoint so i didnt notice this behaviour before.

Steps to reproduce:  
1) activate the touchpad via fn-f8
2) create a new image in gimp and try out some tools -> no crash happens
[ 3) deactivate touchpad via terminal -> no crash ]
4) deactivate the touchpad via fn-f8 and click on the gimp workspace -> xserver 
crashes instantly
     (reactivating the touchpad via terminal before pressing fn-f8 doesnt 
change the result)

Some further tests:

1) Deactivating the touchpad in the bios:
       a) only trackpoint -> no crash (pressing fn-f8 has obviously no effect 
as no touchpad is active)
       b) trackpoint and a simple external mouse  -> same as above

2) Deactivating the trackpoint in the bios:
       a) only touchpad  -> obviuosly can't click on the gimp workspace if the 
touchpad is disabled, so no way to tell
       b) touchpad and external mouse -> crash once you follow the steps 
described above.

3) Using external mouse, trackpoint and trackpad  
     -> crash if you click with mouse or trackpoint once the touchpad is 
deactivated using fn-f8

Well, it really seems to be related to the touchpad or rather it's
deactivation using the keycombo.

As a workaround, you can simply activate your touchpad via fn-f8 and
keep it on, deactivate it via teminal or diable it in the bios of your
laptop.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1021517

Title:
  Xorg-server crashes reproducible with GIMP usage

To manage notifications about this bug go to:
https://bugs.launchpad.net/gimp/+bug/1021517/+subscriptions

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