cannot not set HDR

in garrysmod, HDR is not on the little list, but in another profile it is set…
it has caused it to be stuck in bloom, leaving an unfavorable, low grade, very bright effect in game… unlike the other profile, which is just fine, this is the case for all source games I have [Portal, Tf2, Cs:s, HL2 ep1, ep2, but oddly not lost coast or deathmatch][deathmach is “unstable” allways crashing at seemingly random intervolts, but that is unnessisary realy]
I do not own HalfLife 2 reguler, but that dose not matter.
any helping ideas? please?

You cannot not set it?
As in, you can set it?