laptop_panel.duplicate_video_device quirk?

Julian Sikorski belegdol at
Wed Jan 2 21:56:01 PST 2008

Ben Liblit pisze:
> Julian Sikorski wrote:
>> Will this work if two devices are exactly the same?
> It is very unlikely that the devices are *exactly* the same.  You just
> need to pick the right feature by which to distinguish them.  For
> example, on my laptop the stuff in /sys/class/backlight/acpi_video0
> doesn't do anything, whereas the stuff in
> /sys/class/backlight/acpi_video1 seems to work.  So I added the local
> quirk attached below, which uses the sysfs path to recognize and kill
> the unwanted acpi_video0 device.
> I do *not* claim that my local fix is general, or should be applied
> blindly to anyone else's machine.  It's just a hard-coded fix for my
> box.  But it at least illustrates how one might detect and disable an
> unwanted duplicate video device.
> Is it possible to generalize my fix so that it does apply to a variety
> of machines?  I don't know; I haven't tried.  Maybe.  {shrug}
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I got it. I'll play with that and report back.


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