radeon: different colors on different heads?

[Alex Deucher]

2009/11/11 Csillag Kristof <Csillag.Kristof.ext at united-consult.hu>:
> Alex Deucher wrote:
>
> On Tue, Nov 10, 2009 at 10:57 PM, Csillag Kristof
>> <csillag.kristof at united-consult.hu> wrote:
>> > Hi all,
>> >
>> > I have two identical (Samsung 214T) monitors attached to the two outputs
>> > of a FireMV 2200 PCI card (RV280 based).
>> >
>> > I see something strange: there are some colors (mostly from the dark
>> > blue range) which are rendered completely differently by the two
>> > monitors. (One of them does black instead of dark blue.)
>
>> Does adjusting the gamma on the problematic head help?
> How do I do that? (Please excuse me for my ignorance;
> I have never encountered this setting before.)

using xrandr.  see the xrandr man page.  Something like:
xrandr --output <output> --gamma <r>:<g>:<b>

>
>> Also are you using digital or analog connections for you monitors?
> Both monitors are connected via DVI.
> (And one of the is using CustomEDID for bypass monitor detection, because
> the monitor is somewhat broken.)

Ok.

Alex