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Subject: Re: 2.6.30-rc1 (latest git): ACPI video backlight support broken.
 (WAS:thinkpad-acpi: cannot control brightness with hotkeys )
From: Maxim Levitsky <maximlevitsky@gmail.com>
To: Niel Lambrechts <niel.lambrechts@gmail.com>
Cc: "linux.kernel" <linux-kernel@vger.kernel.org>
In-Reply-To: <49E10684.5090101@gmail.com>
References: <49E10684.5090101@gmail.com>
Content-Type: text/plain
Date: Mon, 13 Apr 2009 01:38:51 +0300
Message-Id: <1239575931.28597.4.camel@maxim-laptop>
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I have an acer aspire 5720, and have same issue.
I don't use acer-wmi.
I use standard acpi video module, and now it doesn't work
nothing in /sys/class/backlight, and this in dmesg:

[  211.907597] ACPI: Failed to switch the brightness (using hardware
keys)

This is when I try to change brightness, and this on module load


> [ 1910.228636] ACPI Error (video-0537): Current brightness invalid [20090320]
> [ 1910.229006] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/device:34/device:35/input/input9
> [ 1910.390188] ACPI: Video Device [VGA] (multi-head: yes  rom: no  post: no)
> 
> 


Best regards,
	Maxim Levitsky