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From: Richard Purdie <rpurdie@rpsys.net>
To: Alex Romosan <romosan@sycorax.lbl.gov>
Cc: Yaroslav Halchenko <kernel@onerussian.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org,
	linux-fbdev-devel@lists.sourceforge.net,
	James Simmons <jsimmons@infradead.org>
Subject: Re: no backlight on radeon after recent kernel "upgrade"s
Date: Wed, 21 Feb 2007 22:41:57 +0000	[thread overview]
Message-ID: <1172097718.5790.29.camel@localhost.localdomain> (raw)
In-Reply-To: <877iub9mu2.fsf@sycorax.lbl.gov>

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



  reply	other threads:[~2007-02-21 22:42 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-19  4:46 Yaroslav Halchenko
2007-02-19  8:04 ` Andrew Morton
2007-02-19  9:19   ` Richard Purdie
2007-02-21  5:56     ` Yaroslav Halchenko
2007-02-22  0:34       ` Richard Purdie
2007-02-22  1:07         ` James Simmons
2007-02-22  9:46           ` Richard Purdie
2007-02-22 15:18             ` James Simmons
2007-02-22  1:11       ` [Linux-fbdev-devel] " James Simmons
2007-02-22  2:09         ` Joel Becker
2007-02-22 15:55           ` James Simmons
2007-02-22 17:28             ` David Miller
2007-02-28 16:55               ` James Simmons
2007-03-01 10:57                 ` Richard Purdie
2007-03-01 21:08                   ` James Simmons
2007-02-21 22:18     ` Alex Romosan
2007-02-21 22:41       ` Richard Purdie [this message]
2007-02-21 23:17         ` Henrique de Moraes Holschuh
2007-02-22  0:12           ` Richard Purdie
2007-02-22  0:51             ` Henrique de Moraes Holschuh
2007-02-22  1:10               ` Richard Purdie
2007-02-22  2:13                 ` Henrique de Moraes Holschuh
2007-02-22  1:10               ` Henrique de Moraes Holschuh
2007-02-22  1:16                 ` ACPI: ibm-acpi: fix initial status of backlight device Henrique de Moraes Holschuh
2007-02-22 10:03                   ` Richard Purdie
2007-02-22 14:45                     ` Henrique de Moraes Holschuh
2007-02-22 18:19                       ` Henrique de Moraes Holschuh
2007-02-22 10:00                 ` no backlight on radeon after recent kernel "upgrade"s Richard Purdie
2007-02-22 14:56                   ` Henrique de Moraes Holschuh
2007-02-22 15:19                     ` Richard Purdie
2007-02-22 16:00                       ` James Simmons
2007-02-22 16:34                       ` Henrique de Moraes Holschuh
2007-02-22 17:08                         ` Richard Purdie
2007-02-21 23:51         ` Alex Romosan
2007-02-22  1:13           ` James Simmons
2007-02-22  9:56             ` Richard Purdie
2007-02-22 14:38               ` Henrique de Moraes Holschuh
2007-02-22  4:03         ` Alex Romosan
2007-02-22  4:58         ` Alex Romosan

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