linux-kernel - Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys

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Message-ID: <20090413203450.GC16152@khazad-dum.debian.net>
Date:	Mon, 13 Apr 2009 17:34:51 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Niel Lambrechts <niel.lambrechts@...il.com>
Cc:	yakui_zhao <yakui.zhao@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux.kernel" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	mjg59@...f.ucam.org
Subject: Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control
	brightness with hotkeys

On Mon, 13 Apr 2009, Niel Lambrechts wrote:
> >> In 2.6.29.1:
> >> lrwxrwxrwx 1 root root 0 Apr 12 20:01 /sys/class/backlight/acpi_video0
> >> -> ../../devices/virtual/backlight/acpi_video0

Well, that at least confirms that thinkpad-acpi doesn't have anything to
do with your troubles, you were using acpi video.

While the problem isn't fixed, you can try forcing thinkpad-acpi to
provide a backlight interface and use that (docs in
Documentation/laptops/thinkpad-acpi.txt).  But you get to keep both pieces
if that causes the kernel or X.org's GPU drivers to blow up in pieces when
the SMBIOS messes with the GPU behind their backs.

-- 
  "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
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