linux-kernel - Re: no backlight on radeon after recent kernel "upgrade"s

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Date:	Wed, 21 Feb 2007 22:41:57 +0000
From:	Richard Purdie <rpurdie@...ys.net>
To:	Alex Romosan <romosan@...orax.lbl.gov>
Cc:	Yaroslav Halchenko <kernel@...russian.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net,
	James Simmons <jsimmons@...radead.org>
Subject: Re: no backlight on radeon after recent kernel "upgrade"s

On Wed, 2007-02-21 at 14:18 -0800, Alex Romosan wrote:
> Richard Purdie <rpurdie@...ys.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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