On Sat, Dec 21, 2013 at 11:14 AM, Adrian C. <an...@sysphere.org> wrote: > Hello I have a small issue with xgamma for a very long time that nobody > could explain to me, so now I'd like to ask the developers. > > To get decent colors on my workstation and external monitors I want to > apply gamma correction. For me these magic values do it "Gamma 0.75 0.65 > 0.60", I set them in xorg.conf for each monitor. > > If it happens that an external monitor wasn't connected when I started X > I can attach it with xrandr. Well when I do that the colors on the > monitor are completely off. Even though xgamma reports "-> Red 0.750, > Green 0.650, Blue 0.600" when I check, the colors are simply wrong. I > have to kill X, start, and everything is back to normal. These forced > restarts partly defeat the hotplugging ideas in xrandr. > > Here's what Xorg.0.log has to say: >> [ 44816.100] (II) intel(0): Using default gamma of (1.0, 1.0, 1.0) unless >> otherwise stated. >> [ 44816.101] (II) intel(0): Output VGA1 wants gamma correction (0.8, 0.6, >> 0.6) > > Trying to correct colors my self, after using xrandr, isn't succesful. > xgamma doesn't produce good colors. I have also tried to set gamma with > xrandr, both when attaching the display or afterwords, i.e. by using > this switch --gamma 0.75:0.65:0.60 or --gamma 0.8:0.6:0.6. This produces > bad results as well. Colors are always wrong, always very washed out to > my eye. > > Nothing but an X restart does it for years, across 5 portable computers > and all forms and sizes of CRT and LCD monitors. Could anyone explain > why? Thanks.
IIRC, xgamma doesn't work with xrandr 1.2+ capable drivers since they support per display gamma correction and xgamma assumes only a single display. I believe the proper way to adjust it is to use xrandr. Alex _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s
