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    SubjectRe: [PATCH] Added backlight driver for Acer Aspire 4736
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    於 四,2012-03-22 於 09:02 +0530,Pradeep Subrahmanion 提到:
    > On Thu, 2012-03-22 at 11:25 +0800, joeyli wrote:
    > > 於 四,2012-03-22 於 08:03 +0530,Pradeep Subrahmanion 提到:
    > > > 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 .
    > > >
    > >
    > > 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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