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

[Joey Lee]

Hi Melchior, 

於 一，2011-05-02 於 14:08 +0200，Takashi Iwai 提到：
> 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

Yes, please try Takashi's previous patch. 

I am tracing bko#34142, but this issue does not related to your
backlight control, because there have _BCM, _BQC declare in your DSDT,
your machine MUST SUPPORTED by standard acpi backlight interface.

Even the acer-wmi can probed on your machine, it cann't help anything
for your backlight control.


Thank's a lot!
Joey Lee