Red Hat Bugzilla – Bug 832700
Gamma reset to 1.0 on VT switch or suspend/resume, xgamma inconsistent
Last modified: 2013-07-31 13:46:09 EDT
Description of problem:
The X server resets any custom-set gamma settings to 1.0 following a VT switch (or suspend-resume cycle). Note that when it does this, it still thinks that the RGB gamma values are what was set -- but the display is definitely otherwise.
1. Run xgamma:
$ xgamma -rgamma 0.75 -bgamma 0.7 -ggamma 0.7
-> Red 1.000, Green 1.000, Blue 1.000
<- Red 0.750, Green 0.700, Blue 0.700
and note the change in colours.
2. VT switch away and back to X again. Note that it's bluer and brighter.
3. Run xgamma again to find out what's going on:
-> Red 0.750, Green 0.700, Blue 0.700
so the programmed values are still there.
4. Run xgamma -gamma 1.0 to check that's the real current setting.
I've only tested this on Intel HD3000 graphics as this is the only hardware at my disposal.
Version-Release number of selected component (if applicable):
Gamma reset to 1.0 (and xgamma lies)
Consistent, persistent gamma settings.
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