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Message-ID: <1263463781.3544.4714.camel@thor>
Date: Thu, 14 Jan 2010 11:09:41 +0100
From: Michel Dänzer <michel@...nzer.net>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Alex Deucher <alexdeucher@...il.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Dave Airlie <airlied@...hat.com>
Subject: Re: drm/radeon/kms: fix up LVDS handling on macs (v2)
On Thu, 2010-01-14 at 13:45 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2010-01-14 at 00:59 +0000, Linux Kernel Mailing List wrote:
> > Gitweb: http://git.kernel.org/linus/3890ddf56dbc0f804953198e65a7e406ed654576
> > Commit: 3890ddf56dbc0f804953198e65a7e406ed654576
> > Parent: 804c7559e9376c3ba78ae15a30337b1e24f8ae80
> > Author: Alex Deucher <alexdeucher@...il.com>
> > AuthorDate: Tue Jan 12 11:16:57 2010 -0500
> > Committer: Dave Airlie <airlied@...hat.com>
> > CommitDate: Wed Jan 13 13:25:08 2010 +1000
> >
> > drm/radeon/kms: fix up LVDS handling on macs (v2)
> >
> > Based on radeonfb code and recent ddx fix.
> >
> > v2: minor formatting fix from Michel Dänzer
> >
> > Signed-off-by: Alex Deucher <alexdeucher@...il.com>
> > Reviewed-by: Michel Dänzer <michel@...nzer.net>
> > Tested-by: Michel Dänzer <michel@...nzer.net>
> > Signed-off-by: Dave Airlie <airlied@...hat.com>
>
> I have to dbl check that ... but I think the "Real" issue is that some
> panel have inverted polarity on the PWM signal. Thus if BLON is turned
> off the panels goes full backlight instead among other things :-)
>
> However, not all macs are the same. If you look at the radeonfb code,
> we do things differently depending on the mac model...
I have looked at radeonfb for a patch I posted a while ago to expose a
backlight class device with KMS, and I can only see what you describe
above affecting the LVDS_GEN_CNTL backlight level, not BLON or
BL_MOD_EN. Am I missing something?
Without my patch, KMS doesn't change the backlight level at all, so
assuming the firmware manages to enable the backlight, it should stay
like that.
--
Earthling Michel Dänzer | http://www.vmware.com
Libre software enthusiast | Debian, X and DRI developer
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