linux-kernel - Re: 3.16, i915: less colors in X?

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Message-ID: <20140621210652.GA14025@nuc-i3427.alporthouse.com>
Date:	Sat, 21 Jun 2014 22:06:52 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Pavel Machek <pavel@....cz>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	kernel list <linux-kernel@...r.kernel.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: 3.16, i915: less colors in X?

On Sat, Jun 21, 2014 at 10:29:01PM +0200, Pavel Machek wrote:
> 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.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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