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    SubjectRe: [PATCH] Added backlight driver for Acer Aspire 4736
    From
    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 <jlee@suse.com> wrote:
    > 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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