A strange one. In Linux 4.7-rc4, at least as build by the Ubuntu mainline ppa, gamma table updates via RandR don't work. No errors are reported and the X-Server thinks everything went well, but on Intel Ironlake and Ivybridge the updates don't have any visual effect.
The same problem doesn't happen with current drm-next, so something was fixed. Looking at the new code in intel_color.c i can't see anything obvious that would break it on 4.7-rc but make it work on drm-next?
Are there some gamma fixes in drm-next that didn't make it into 4.7-rc yet?
Thanks, -mario
On Wed, Jul 06, 2016 at 12:26:44PM +0200, Mario Kleiner wrote:
A strange one. In Linux 4.7-rc4, at least as build by the Ubuntu mainline ppa, gamma table updates via RandR don't work. No errors are reported and the X-Server thinks everything went well, but on Intel Ironlake and Ivybridge the updates don't have any visual effect.
The same problem doesn't happen with current drm-next, so something was fixed. Looking at the new code in intel_color.c i can't see anything obvious that would break it on 4.7-rc but make it work on drm-next?
Are there some gamma fixes in drm-next that didn't make it into 4.7-rc yet?
Not sure what's going on, but might need a reverse bisect to cherry-pick the fixes over. It's indeed supposed to keep working. Lionel has been working on this, adding him. -Daniel
Thanks, -mario _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
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Mario Kleiner