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    SubjectRe: [PATCH] Added backlight driver for Acer Aspire 4736
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    On Tue, 2012-03-13 at 13:34 +0000, Matthew Garrett wrote:
    > On Tue, Mar 13, 2012 at 06:56:16PM +0530, Pradeep Subrahmanion wrote:
    > > I tried giving acpi_backlight = vendor . In that case hot key for
    > > brightness control is working. But i think , it is not calculating the
    > > correct value for brightness because increasing brightness after maximum
    > > level gives blank screen .
    >
    > Which backlight device appears then?
    >

    'intel_backlight' appears when i gave option acpi_backlight = vendor. Writing to /sys/class/backlight/intel_backlight/brightness

    does not cause any change in brightness.

    > > By ' ACPI interface' , I mean 'acpi_video0' inside the
    > > /sys/class/backlight. I havn't tried the /sys/class/backlight interface
    > > directly . I will try that also.
    >
    > So writing values into /sys/class/backlight/acpi_video0/brightness does
    > nothing?


    No change in value when writing
    to /sys/class/backlight/acpi_video0/brightness.

    Another thing is that when i did boot with acpi_backlight = 'acer_wmi' ,
    in new kernel (3.3.0-rc7) , it shows following messages ,

    [ 8.350825] wmi: Mapper loaded
    [ 10.363975] acer_wmi: Acer Laptop ACPI-WMI Extras
    [ 10.396186] acer_wmi: Function bitmap for Communication Device: 0x91
    [ 10.396385] acer_wmi: Brightness must be controlled by generic video
    driver

    Also there was no interface inside /sys/class/backlight for acer_wmi.

    I also tried writing directly to Embedded controller register .But no
    change.

    ----

    Thanks ,

    Pradeep Subrahmanion





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