Re: Um... A little help? (Steam, TF2, GMOD)
What does glxinfo | grep GL_EXT_texture_sRGB show? If you do not have glxinfo, install mesa-utils.
My old PC still running 10.04 with ATI X1300 graphics (default Radeon driver) shows GL_EXT_texture_sRGB, but not GL_EXT_texture_sRGB_decode.
But 12.04.3 iso booted on that PC from USB stick shows both functions, even with that old legacy card from before AMD bought ATI. And likewise both functions show up when that USB stick is booted on a newer tablet PC with ATI HD 6250 graphics. So the issue is not that the default Radeon driver does not support GL_EXT_texture_sRGB_decode (maybe the video chip does not).
Are you running the default Radeon driver and is your system up to date, or are you trying to run fglrx driver that no long supports your video chip?
i5 650 3.2 GHz, 8 GB, nvidia GTX 750 Ti, 32" 1080p | i7-4700MQ, 8 GB, Intel HD 4600/nvidia GTX 765M, 15.6" 1080p | etc.