Bug#166413: mga driver doesn't set gamma on second screen
On Mon, 2002-10-28 at 16:12, Jeffrey Baker wrote:
> On Mon, Oct 28, 2002 at 12:31:40PM +0100, Michel D?nzer wrote:
> > On Mon, 2002-10-28 at 04:07, Marc Wilson wrote:
> > > On Sun, Oct 27, 2002 at 07:25:51PM -0500, 166413@bugs.debian.org wrote:
> > > > 2) It is possible that this is a hardware limitation. Multiple-output
> > > > video cards often don't support all features on secondary "heads".
> > >
> > > I always had the problem with my G450 and later with my G550 that X
> > > wouldn't set the gamma the same on both heads, although it claimed that it
> > > was according to the log. The monitors were the same make and model, and
> > > the difference was distinct and annoying.
> > >
> > > OTOH, xgamma was always quite willing to set the gamma on the heads
> > > separately, and I was also able to specify specific gamma settings for each
> > > monitor in XF86Config-4 and have them take effect.
> >
> > I thought I'd read on the Xpert list that the second head of those cards
> > indeed doesn't have a hardware palette and thus can't do gamma
> > correction. I can't offer any first hand experience though.
>
> I don't think this is the problem, because I use a machine with two
> matrox cards (a G400 and a Millenium II) in a Xinerama setup, and
> xgamma will only change the gamma on the first head. The capability
> is obviously there to set gamma on both in hardware.
Maybe you need the -screen option to xgamma?
--
Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member / CS student, Free Software enthusiast
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