Richard Purdie [off-list ref] writes:

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

i don't have my laptop with me but i am pretty sure
FB_RADEON_BACKLIGHT wasn't set for 2.6.20 (i think it showed up as a
new option when i did make oldconfig). i'll post the difference when i
get home tonight and also try disabling it.

--alex--

-- 
| I believe the moment is at hand when, by a paranoiac and active |
|  advance of the mind, it will be possible (simultaneously with  |
|  automatism and other passive states) to systematize confusion  |
|  and thus to help to discredit completely the world of reality. |