Bug#166413: mga driver doesn't set gamma on second screen

[brett-debian-bugs]

Package: xserver-xfree86
Version: 4.2.1-3

I added a:
    Gamma   1.8
to my XF86Config-4 file and upon restart it was obvious that my primary
monitor had it's gamma set to 1.8, but the secondary one was still set
to 1.0 even though the X log and xgamma claimed it was set at 1.8
Setting any gamma with xgamma on the second screen has no effect.  This
is on a matrox G450 dualhead with 2 identical ViewSonic P810 21" monitors.
-Brett Carter