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    SubjectRe: no backlight on radeon after recent kernel "upgrade"s
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    On Wed, 2007-02-21 at 14:18 -0800, Alex Romosan wrote:
    > Richard Purdie <rpurdie@rpsys.net> writes:
    > i have exactly the same problem with 2.6.21-rc1 on a thinkpad t40
    > with an ati radeon card. the machine boots up but the backlight never
    > comes on. 2.6.20 worked okay.

    Can you have a look at the differences between the defconfigs for 2.6.20
    and 2.6.21-rc1?

    If the backlight changes are at fault, I'm guessing James' Kconfig
    changes to the video Kconfig would be the culprit since
    FB_RADEON_BACKLIGHT only used to be selectable if PMAC_BACKLIGHT was
    enabled. On a thinkpad, the backlight is probably under ACPI control.

    If FB_RADEON_BACKLIGHT wasn't set for 2.6.20, can you try 2.6.21-rc1
    with that option disabled?

    An ls /sys/class/backlight under 2.6.20 will tell us which driver it was
    using...

    Thanks,

    Richard


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