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 03:41:28 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Niel Lambrechts <niel.lambrechts@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>, mjg59@...f.ucam.org,
	yakui_zhao <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 01:59 +0200, 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
> 
> ---
> 
> Matthew, can you help?
> 
> Regards,
> Niel


Just to note,

I have nvidia, and yet have the same bug.
I reverted this commit - didn't help.

I get lots of 
ACPI: Failed to switch the brightnes
when I press hardware keys that change brightness
(even these sometimes don't work)


the /sys/class/backlight is empty

2.6.29 works fine.


Best regards,
	Maxim Levitsky

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