From acer acpi ,I came to know that the 4730 series uses new wmi interface .

http://code.google.com/p/aceracpi/wiki/SupportedHardware

Thanks ,

Pradeep Subrahmanion

On Thu, Mar 22, 2012 at 9:24 AM, joeyli [off-list ref] wrote:

©ó ¥|¡A2012-03-22 ©ó 09:02 +0530¡APradeep Subrahmanion ´£¨ì¡G

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

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©ó ¥|¡A2012-03-22 ©ó 08:03 +0530¡APradeep Subrahmanion ´£¨ì¡G

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

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©ó ¥|¡A2012-03-22 ©ó 00:39 +0530¡APradeep Subrahmanion ´£¨ì¡G

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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=UUIDð197a59-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