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    SubjectRe: i915 backlight
    On Thu, Aug 01, 2013 at 09:13:35AM +0800, Aaron Lu wrote:
    > Can you please run acpi_listen and then press the Fn-Fx key, see if the
    > events are correctly sent out?

    Like this?

    # acpi_listen
    video/brightnessdown BRTDN 00000087 00000000
    video/brightnessup BRTUP 00000086 00000000
    video/brightnessdown BRTDN 00000087 00000000
    video/brightnessup BRTUP 00000086 00000000
    video/brightnessdown BRTDN 00000087 00000000
    video/brightnessup BRTUP 00000086 00000000
    video/brightnessdown BRTDN 00000087 00000000
    video/brightnessup BRTUP 00000086 00000000
    video/brightnessdown BRTDN 00000087 00000000
    ^C

    > From the bug page:
    > https://bugzilla.kernel.org/show_bug.cgi?id=51231#c80
    > I got the impression that both the acpi_video interface and the vendor
    > interface thinkpad_screen are broken. So adding this cmdline here works
    > suggests that either thinkpad_screen works or thinkpad vendor driver
    > doesn't get loaded or doesn't create that interface for some reason.
    >
    > Alternatively, if the intel_backlight interface works(highly possible),
    > you can use xorg.conf to specify the that backlight interface for X.
    >
    > Section "Device"
    > Option "Backlight" "intel_backlight"
    > Identifier "Card0"
    > Driver "intel"
    > BusID "PCI:0:2:0"
    > EndSection

    Yeah, that didn't work *but* manually writing to both:

    /sys/class/backlight/acpi_video0/brightness

    and

    /sys/class/backlight/intel_backlight/brightness

    works.

    The ranges are different, though:

    intel_backlight/actual_brightness:1000
    intel_backlight/bl_power:0
    intel_backlight/brightness:1000
    intel_backlight/max_brightness:4437
    intel_backlight/type:raw

    acpi_video0/actual_brightness:41
    acpi_video0/bl_power:0
    acpi_video0/brightness:41
    acpi_video0/max_brightness:100
    acpi_video0/type:firmware

    I guess I need to write me a dirty script for now ... :-)

    Thanks guys.


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