Comment 7 for bug 623399

Just as an additional note, this issue does seem to contribute to occasional crashes in mutter:

[12164.703625] mutter[1974]: segfault at 8 ip 00007f7fbf1d9e53 sp 00007fffb28b6600 error 4 in libnvidia-glcore.so.256.44[7f7fbe48a000+128e000]