On Thu, 2012-03-22 at 09:33 +0800, joeyli wrote:
> 於 四，2012-03-22 於 00:39 +0530，Pradeep Subrahmanion 提到：
> > > This new patch should remove acpi_video0 interface on your machine.
> > > Please kindly provide your dmidecode:
> > >  dmidecode > dmidecode.log
> > >
> > > And, 
> > > please make should the patch really applied, you can do a bit change on
> > > pr_info message by yourself.
> > 
> >    Sorry . I think there was some mistake . I tried the patch again. Now
> > I see only intel_backlight inside /sys/class/backlight. There is no
> > acer-wmi interface . Is this the expected behavior ? . Or am I missing
> > anything ?
> > 
> 
> Yes, this is the expected behavior! But, now I doubt your issue was
> workaround by acpi_osi=Linux but not intel_backlight.
>

> > 
> > 
> > > 
> > > > echo 5 > /sys/class/backlight/acpi_video0/brightness 
> > > > echo 5 > /sys/class/backlight/intel_backlight/brightness
> > > > 
> > > > But it doesn't make any change . 
> > > > 
> > > > In my case  , 'acpi_backlight = vendor' does not make any difference since the hot key control 
> > > > 
> > > > already starts working with 'acpi_osi=Linux' option.
> > > > 
> > > > cat /proc/cmdline gives , 
> > > > 
> > > > BOOT_IMAGE=/boot/vmlinuz-3.3.0+
> > > > root=UUID=f0197a59-c067-4fd8-ad90-c4d721816077 ro acpi_osi=Linux 
> > > > 
> > > > 
> > > > Thanks , 
> > > > 
> > > > Pradeep Subrahmanion
> > > > 
> > > 
> > > OK, that's more clearly, please remove acpi_osi=Linux then re-test, I
> > > think the hotkey of backlight control only works with acpi_osi=Linux ?
> > > 
> 
> Does your backlight control still work if you remove acpi_osi=Linux ?

   If I remove acpi_osi=Linux , the hot key control stops working .

> 
> 
> Thanks a lot!
> Joey Lee
> 

Thanks , 

Pradeep Subrahmanion