Messages in this thread | | | Date | Sun, 22 Jun 2014 17:11:11 +0200 | From | Pavel Machek <> | Subject | regression: 3.16, i915: less colors in X?, caused by 773875bfb6737982903c42d1ee88cf60af80089c |
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Hi!
> > > I just test-booted 3.16-rc1, and background in X looked just wrong -- > > > very noticeable bands on the background gradient. I thought that maybe > > > it is just my eyes, but I went back to older kernel, and background is > > > ok now. > > > > > > I'm trying to figure out how to ask X what color depth it is using...? > > > > > > This is thinkpad x60 with Debian 6.0.9. > > > > > > Any ideas? > > > > That suggests that the panel dithering changed. Compare intel_reg_dumper > > output for both kernels, especially PIPE.CONF.
intel_reg_dumper has so many dependencies that it is basically impossible to get working :-(.
Anyway, this seems to be the problem; if I revert it, my colors are back.
commit 773875bfb6737982903c42d1ee88cf60af80089c Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Jan 27 10:00:30 2014 +0100
drm/i915: Don't set the 8to6 dither flag when not scaling
Apparently we really only need this when the pfit is enabled, at least I couldn't dicern any difference here. Furthermore the hacks we have to reconstruct this bit is a bit glaring, and probably only works because we can't move the lvds port to any other pipe than pipe B on gen2/3.
So let's just rip this out.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77137 (the LVDS WARNING log, not the main "VGA can't be turned on" issue). Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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