Created attachment 88506 [details]
The black spots.

When I'm looking on my teammates with flashlight, there are black spots on
them. The black spots are moving very fast. It doesn't happens with
walls/zombies, only with teammates.

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System information:

Radeon HD 4850
Ubuntu 12.04.3
Linux 3.12-rc7
X.Org server version: 1.11.3
libdrm2 version: 2.4.47+git1310301030.45810d~gd~p
xserver-xorg-video-radeon version: 7.2.0+git1310021050.f1dc67~gd~p
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL version string: 3.0 Mesa 10.0.0-devel (git-b16b3c8 precise-oibaf-ppa)
OpenGL shading language version string: 1.30