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    SubjectRe: regression since 2.6.36: backlight in sony-laptop not working
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    On Fri, 2010-11-12 at 11:50 +0800, Norbert Preining wrote:
    > On Fr, 12 Nov 2010, Matthew Garrett wrote:
    > > > Seems so that the sys files have changed to new locations:
    > > > /sys/devices/virtual/backlight/acpi_video0/brightness
    > > >
    > > > (mind the additional "virtual")
    > > > as well as thermal zone etc etc.
    > > >
    I think the /sys/class/thermal/ and /sys/class/backlight/acpi_video0
    still exists, right?

    we make ACPI video procfs I/F depend on CONFIG_ACPI_PROCFS, which is
    cleared by default, in 2.6.36, and removed this I/F in 2.6.37-rc1.
    perhaps the backlight control depends on the procfs I/F?

    thanks,
    rui

    > > > Could that explain the problem?
    > >
    > > Only if you have some wonderfully badly written software. What are you
    > > using to control the backlight? Also, I'd note that in this case your
    > > backlight is controlled via ACPI, not sony-laptop.
    >
    > Ah right, yes, so probabyl sony-laptopt has nothing to do with it.
    >
    > THen the problem is simply that the acpi events are not coming through
    > when pressing the respective keys.
    >
    > But *that* might be part of the sony-laptop kernel module?
    >
    > Best wishes
    >
    > Norbert
    > ------------------------------------------------------------------------
    > Norbert Preining preining@{jaist.ac.jp, logic.at, debian.org}
    > JAIST, Japan TeX Live & Debian Developer
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