linux-kernel - Re: enabling kms for i915 disables brightness control and xrandr

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Date:	Tue, 31 Mar 2009 00:57:50 +0200
From:	Soeren Sonnenburg <sonne@...ian.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Sitsofe Wheeler <sitsofe@...oo.com>, linux-kernel@...r.kernel.org,
	Eric Anholt <eric@...olt.net>, dri-devel@...ts.sourceforge.net
Subject: Re: enabling kms for i915 disables brightness control and xrandr

On Mon, 2009-03-30 at 14:34 -0700, Jesse Barnes wrote:
> On Mon, 30 Mar 2009 15:37:19 +0200
> Soeren Sonnenburg <sonne@...ian.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
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