Subject: Re: enabling kms for i915 disables brightness control and xrandr
From: Soeren Sonnenburg <sonne@debian.org>
To: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Sitsofe Wheeler <sitsofe@yahoo.com>, linux-kernel@vger.kernel.org,
       Eric Anholt <eric@anholt.net>, dri-devel@lists.sourceforge.net
In-Reply-To: <20090330143447.5653d522@hobbes>
References: <1238322841.4185.36.camel@localhost>
	 <20090329130702.GA23660@sucs.org> <1238332957.4185.74.camel@localhost>
	 <1238420239.4575.2.camel@localhost>  <20090330143447.5653d522@hobbes>
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Date: Tue, 31 Mar 2009 00:57:50 +0200
Message-Id: <1238453870.11937.72.camel@localhost>
Mime-Version: 1.0
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 3033
Lines: 66

On Mon, 2009-03-30 at 14:34 -0700, Jesse Barnes wrote:
> On Mon, 30 Mar 2009 15:37:19 +0200
> Soeren Sonnenburg <sonne@debian.org> wrote:
> 
> > On Sun, 2009-03-29 at 15:22 +0200, Soeren Sonnenburg wrote:
> > > On Sun, 2009-03-29 at 14:07 +0100, Sitsofe Wheeler wrote:
> > > > (CC'ing dri-devel, Eric Anholt and Jesse Barnes)
> > > > 
> > > > On Sun, Mar 29, 2009 at 12:34:01PM +0200, Soeren Sonnenburg wrote:
> > > > > Dear all,
> > > > > 
> > > > > I am not sure if this is just a user error/ too old userspace
> > > > > problem,
> > > > 
> > > > [User stated that 2.6.3 intel driver is being used in another
> > > > email]
> > > 
> > > Just to not cause any (further?) confusion, I was using 2.6.1 when I
> > > wrote that email and after compiling/upgrading to 2.6.3 a number of
> > > problems vanished (like Xv works, screen resolution is correct,
> > > things are *a lot* faster with UXA). However, brightness still only
> > > works via setpci and xrandr only shows the 1024x600 modeline.
> > > 
> > > > > but I recognized that when I enable kernel based modesetting on
> > > > > a intel 945 based samsung nc 10 netbook, I loose brightness
> > > > > control from within X and X resolutions are wrong (instead of
> > > > > 1024x600 it is 1024x1024) and xrandr does no longer have the
> > > > > all the modelines ranging from 1024x600 to 640x350... Trying to
> > > > > change resolutions / setting the brightness via xrandr results
> > > > > in error messages being printed. 
> > > > > 
> > > > > Furthermore, this same flag disables Xv support..
> > > > > 
> > > > > However, screen switches between terminal and X are quite fast
> > > > > now (without any flicker) and suspend and everything works
> > > > > stably.
> > > > > 
> > > > > I recognized that I can set the brightness via
> > > > > 
> > > > > setpci -s 00:02.1 F4.B=XX
> > > > > 
> > > > > (XX ranging from 00 to FF) just fine...
> > 
> > One more thing: Connecting an external display I could turn it on via
> > xrandr --auto successfully. However, it was not possible to turn the
> > internal display off (xrandr --output LVDS1 --off) and switching to
> > the console with the external display connected I managed to freeze
> > the machine. Turning the external display off worked somehow (the
> > display then showed vertical stripes) but I could switch to console.
> 
> Have you filed bugs for these problems?  I think the brightness control
> issue is due to some missing bits on the 2D side (we don't enable
> backlight property control when KMS is active, but should), the other
> issues sound like bugs.

I did nothing besides asking here on lkml. Where should I report what?

Soeren
-- 
For the one fact about the future of which we can be certain is that it
will be utterly fantastic. -- Arthur C. Clarke, 1962
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/