於 四，2012-03-22 於 09:02 +0530，Pradeep Subrahmanion �到：

On Thu, 2012-03-22 at 11:25 +0800, joeyli wrote:

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於 四，2012-03-22 於 08:03 +0530，Pradeep Subrahmanion �到：

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On Thu, 2012-03-22 at 09:33 +0800, joeyli wrote:

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於 四，2012-03-22 於 00:39 +0530，Pradeep Subrahmanion �到：

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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.

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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=UUIDğ197a59-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 .

What is the preload OS in your machine when you bought it? Windows XP,
Vista or Windows 7?

  
   It was Windows XP.

The WDDM driver didn't support by Windows XP, the brightness control on
XP should works with _BCM or OpRegion.

Wonder how does brightness control work on XP with your machine.

I will dig more in your dsdt...


Thanks
Joey Lee

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