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[Bryce Harrington <748487@xxxxxxxxxxxxxxxxxx>]

Given this is failing in bo code and is a recent regression (I presume?)
I wonder if this could be fallout from the
100_intel_remember_named_bo.patch patch we recently backported into
libdrm.

Could you please test downgrading to the version of libdrm prior to when
this patch was introduced, version 2.4.23-1ubuntu5?  You can obtain i386
debs of this version from here:

https://launchpad.net/ubuntu/+source/libdrm/2.4.23-1ubuntu5/+buildjob/2332340

You can go ahead and install all the debs; as a minimum you'll want
libdrm-nouveau1a, libdrm2, and libkms1.  You'll want to logout and log
back in after installing this, for the change to take effect in your X
session.

Boot that and repeat the steps you take to reproduce this bug, and
verify with the -1ubuntu5 version you don't see the issue.

** Changed in: mesa (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/748487

Title:
  compiz assert failure: compiz: nouveau_context.c:260:
  nouveau_update_renderbuffers: Assertion `!ret' failed.