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    SubjectRe: ACPI video.c brightness handler conflicts with toshiba_acpi
    Date
    On Monday 27 October 2008 17:52:55 Andrey Borzenkov wrote:
    > On Monday 08 September 2008, Thomas Renninger wrote:
    > > On Saturday 06 September 2008 09:19:59 am Andrey Borzenkov wrote:
    > > > On Saturday 06 September 2008, Andrey Borzenkov wrote:
    > > > > I have now two different devices that refer to the same hardware:
    > > > >
    > > > > lrwxrwxrwx 1 root root 0 2008-09-06 11:04 acpi_video0 ->
    > > > > ../../devices/virtual/backlight/acpi_video0/ lrwxrwxrwx 1 root root 0
    > > > > 2008-09-06 11:04 toshiba -> ../../devices/virtual/backlight/toshiba/
    > > > >
    > > > > Unfortunately, due to ACPI implementation the acpi_video0 one is much
    > > > > inferior (as it provides only effectively two levels instead of 8);
    > > > > and user level tools are apparently quite confused which one to
    > > > > select.
    > > > >
    > > > > Is there any mechanism that would allow tochiba_acpi to claim
    > > > > brightness for internal LCD screen that video would not attempt to
    > > > > grab it too?
    > > > >
    > > > > Of course manually disabling brightness handling in video is always
    > > > > possible,
    > > >
    > > > Actually it is not. brightness_switch_enabled only disables event
    > > > handling; it still resets actual brightness on loading and creates
    > > > sysfs files to confuse user space.
    > > >
    > > > > still is nice for this to be handled automatically.
    > >
    > > It is in latest ACPI test branch queued for 2.6.28.
    >
    > It is still not in rc2; is it scheduled for 2.6.28 or delayed further?

    Right, it's not there.
    Len, what happened with the:
    "Check for ACPI backlight support otherwise use vendor ACPIdrivers - version 4"
    patches?

    They are pretty essential for video.ko.
    Otherwise graphics devices may get double poked (through vendor_acpi.ko drivers)
    or may register for graphics cards which are not there.

    Thomas


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