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From: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
To: Richard Purdie <rpurdie@rpsys.net>
Cc: Alex Romosan <romosan@sycorax.lbl.gov>,
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 21:17:06 -0200 [thread overview]
Message-ID: <20070221231706.GA3336@khazad-dum.debian.net> (raw)
In-Reply-To: <1172097718.5790.29.camel@localhost.localdomain>
On Wed, 21 Feb 2007, Richard Purdie wrote:
> enabled. On a thinkpad, the backlight is probably under ACPI control.
BIOS+ACPI, actually. Without ACPI video loaded, the firmware does
everything correctly. With ACPI video, the firmware does it, then its
changes are clobbered over by ACPI video's.
If ibm-acpi is loaded, a backlight device "ibm" is added. ibm-acpi's ibm
backlight device can change the display brightness. It is *not* capable of
turning the backlight on or off, AFAIK.
BTW, some ThinkPads don't have a Radeon, but rather an Intel GM/GMX device.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
next prev parent reply other threads:[~2007-02-21 23:17 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
2007-02-21 23:17 ` Henrique de Moraes Holschuh [this message]
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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