On Wed, 2007-02-21 at 14:18 -0800, Alex Romosan wrote: > Richard Purdie <[EMAIL PROTECTED]> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
