I would be very surprised. I do know that both Intel and ATI chips support it in texture hardware.

See this, for example:

http://www.x.org/docs/AMD/R5xx_Acceleration_v1.5.pdf

Bit 21 of TXFORMAT0:

    GAMMA 21 none Optionally remove gamma from texture before passing to
              shader. Only apply to 8bit or less components.
           POSSIBLE VALUES:
                 00 - Disable gamma removal
                 01 - Enable gamma removal

There is also support for re-applying gamma before storing to a color buffer.