Comment 37 for bug 419328

Bryce Harrington (bryce) wrote :

j^ - Thanks for the steps to reproduce. I've forwarded this bug upstream to https://bugs.freedesktop.org/show_bug.cgi?id=23718 - please subscribe yourself to this bug, in case they need further information or wish you to test something. Thanks ahead of time!

From your additional information it looks like this may be an "X Freeze" bug. Some additional debug steps are available for this class of issue: https://wiki.ubuntu.com/X/Troubleshooting/Freeze#How%20to%20Get%20a%20Batchbuffer%20Dump%20(-intel%20only)