linux-kernel - Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys (BISECTED)

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Date:	Wed, 15 Apr 2009 14:35:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Niel Lambrechts <niel.lambrechts@...il.com>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"mjg59@...f.ucam.org" <mjg59@...f.ucam.org>,
	"Zhao, Yakui" <yakui.zhao@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux.kernel" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control
 brightness with hotkeys (BISECTED)

On Wed, 2009-04-15 at 08:53 +0200, Niel Lambrechts wrote:
> On 04/15/2009 03:50 AM, Zhang Rui wrote:
> > On Wed, 2009-04-15 at 07:59 +0800, Niel Lambrechts wrote:
> >   
> >> On 04/13/2009 10:34 PM, Henrique de Moraes Holschuh wrote:
> >>     
> >>> On Mon, 13 Apr 2009, Niel Lambrechts wrote:
> >>>   
> >>>       
> >>>>>> In 2.6.29.1:
> >>>>>> lrwxrwxrwx 1 root root 0 Apr 12 20:01 /sys/class/backlight/acpi_video0
> >>>>>> -> ../../devices/virtual/backlight/acpi_video0
> >>>>>>         
> >>>>>>             
> >>> Well, that at least confirms that thinkpad-acpi doesn't have anything to
> >>> do with your troubles, you were using acpi video.
> >>>   
> >>>       
> >> Okay, I've bisected it to:
> >>
> >> 74a365b3f354fafc537efa5867deb7a9fadbfe27 is first bad commit
> >> commit 74a365b3f354fafc537efa5867deb7a9fadbfe27
> >> Author: Matthew Garrett <mjg59@...f.ucam.org>
> >> Date:   Thu Mar 19 21:35:39 2009 +0000
> >>
> >>     ACPI: Populate DIDL before registering ACPI video device on Intel
> >>
> >>     
> >
> > please set CONFIG_DRM_I915_KMS, reload the ACPI video driver after
> > loading i915 and see if it helps.
> >   
> In all the kernels I've tried (up to 2.6.30-rc2), I get issues with KMS:
> 
> I boot with 'modeset=1 i915=1', console login is okay and 'modprobe i915
> modeset=1' seems to work - the console resolution changes (very small
> 1920x1200).

Hehe, at least you get something, I consistently get a black screen
whenever KMS gets enabled in a config.



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