XFree86 Kde and Intel 82845G gamma problem

[Nathan Coulter <org.debian.debian-user@pooryorick.com>]

The gamma for my display (a Sylvania LCD panel) is off.  Several
gradients of light grey appear white.  Nothing I do changes the active
gamma setting.  I've tried xgamma, the KDE control center, and manually
editing XF86Config-4.  The monitor gamma never changes.  Any ideas?

XFree86 Version 4.3.0.1 (Debian 4.3.0.dfsg.1-12.0.1 20050223080930
joshk@triplehelix.org)

KDE: 3.3.2

Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics
Device

Thanks in advance,