Date: Mon, 16 Jun 2008 18:19:03 -0600
From: Robert Hancock <hancockr@shaw.ca>
Subject: Re: [regression] display dimming is slow and laggy
In-reply-to: <fa.bYtHs6zUqCWUnOriVTRy2wrCy7s@ifi.uio.no>
To: Maximilian Engelhardt <maxi@daemonizer.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Message-id: <485702F7.6060704@shaw.ca>
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Maximilian Engelhardt wrote:
> Hello,
> 
> I'm using kernel 2.6.26-rc6 at the moment and with it dimming the display is 
> slow and laggy. Using kernel 2.6.25 doesn't show this problem.
> 
> Here is a more detailed explanation:
> 
> I'm dimming my display with the appropriate keys on my laptop (Fn + 
> right/left). Till kernel 2.6.25 this has worked without any problems. Now I'm 
> using 2.6.26-rc6 and using the keys the display is dimming much slower and 
> also laggy. By laggy I mean if I hit the keys for increasing/decreasing 
> brightness it starts dimming and when I release the keys after some time it 
> still continues dimming for some steps.
> 
> My laptop is a Acer Travelmate 661lci and has an Intel 855 chipset.
> 
> I'll attach my dmesg output, please tell me if you need any further 
> information.

Think you forgot the dmesg. Are you seeing a "ACPI: EC: GPE storm 
detected, disabling EC GPE" message? See:

http://bugzilla.kernel.org/show_bug.cgi?id=10724

This seems to affect a lot of Acer laptops.
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