linux-kernel - Re: i915/kms/backlight-combo mode problem (was: Re: Linux 2.6.39-rc5)

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Date:	Mon, 02 May 2011 14:08:59 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Melchior FRANZ <melchior.franz@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Chris Wilson <chris@...is-wilson.co.uk>,
	dri-devel@...ts.freedesktop.org,
	Carlos Corbacho <carlos@...angeworlds.co.uk>
Subject: Re: i915/kms/backlight-combo mode problem (was: Re: Linux 2.6.39-rc5)

At Sat, 30 Apr 2011 13:34:51 +0200,
Melchior FRANZ wrote:
> 
> Dropping Linus from the CC.
> 
> 
> * Takashi Iwai -- Saturday 30 April 2011:
> * * At Sat, 30 Apr 2011 10:32:04 +0200, Melchior FRANZ wrote:
> > > Yes, backlight adjustment generally works on this notebook, but only
> > > with "acpi_osi=Linux" on the command line.
> > 
> > acpi_osi quirk should be better added statically, then.
> 
> No, I guess the problem here is that acer_wmi doesn't support this
> machine yet. I told the ACER WMI maintainer and sent a DSDT image,
> but this message was thoroughly ignored.
> 
> 
>   $ dmesg|grep -i acer
>   [    0.000000] DMI: Acer TM5735/BA51_MV, BIOS V1.04 09/23/2010
>   [   71.850534] acer_wmi: Acer Laptop ACPI-WMI Extras
>   [   72.350278] acer_wmi: Unable to detect available WMID devices
>   
>   Machine: Acer Travelmate 5735Z-452G32Mnss

Hm, but the backlight control is done via the standard ACPI, no?
If so, the fact that acer_wmi doesn't work sounds irrelevant.

BTW, did you try my previous patch?


Takashi
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