Comment # 48 on bug 27501 from Ratchanan Srirattanamet

Will Pierre Moreau's patch be merged? This patch fix acceleration on system
with only 9400M too. Symptom is X can start but gets locked up when I run
glxgears for a while. System is Ubuntu 14.10 with Linux 3.17 compiled from git.
After apply this patch, the symptom disappear.