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

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Message-ID: <877iub9mu2.fsf@sycorax.lbl.gov>
Date:	Wed, 21 Feb 2007 14:18:13 -0800
From:	Alex Romosan <romosan@...orax.lbl.gov>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Yaroslav Halchenko <kernel@...russian.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: no backlight on radeon after recent kernel "upgrade"s

Richard Purdie <rpurdie@...ys.net> writes:

> On Mon, 2007-02-19 at 00:04 -0800, Andrew Morton wrote:
>> On Sun, 18 Feb 2007 23:46:16 -0500 Yaroslav Halchenko <kernel@...russian.com> wrote:
>> > Since the most recent successful for me kernel 2.6.19-rc6-mm1, I've
>> > tried few times to build more recent snapshots and now finally
>> > 2.6.20-mm2. In all those cases I have a sad outcome -- kernel boots but
>> > at some point during boot (few moments after Penguin icon in the top left
>> > corner appears), light turns off... I still can see something, especially
>> > if I light a strong flashlight at a sharp angle.
>> > 
>> > I've enabled back-light support and lcd support for those unsuccessful
>> > kernels (with all backlight support features disabled kernel boots
>> > ok and backlight shines as bright as always)
>>
>> Is 2.6.20 broken?  I assume the latest 2.6.20-gitN snapshot are failing..
>
> It would be extremely useful to know which kernel versions you tested
> and which ones failed. There are a number of backlight changes which are
> just in 2.6.20-mm1 and -mm2 which it would be useful to rule out or
> identify as the cause.

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.

--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. |
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