linux-kernel - Re: 2.6.21-rc1 dims my LCD

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Date:	Mon, 26 Feb 2007 11:41:30 +0000
From:	Richard Purdie <rpurdie@...ys.net>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-rc1 dims my LCD

Hi,

On Mon, 2007-02-26 at 01:59 +0100, Jiri Kosina wrote:
> 2.6.21-rc1 on my ibm t42p dims a LCD after some time (I guess it happens 
> at the time the console should normally be blanked). 
> 
> When I hit the keyboard, the brightness stays low (it's 50% of light or 
> so, so I could read what's on the screen, but it's uncomfortably dim), and 
> I have to manually raise the brightness on the LCD. Quite annoying :)
>
> I have bisected this to your commit 
> 994efacdf9a087b52f71e620b58dfa526b0cf928

Which framebuffer driver and backlight driver are you using?
("ls /sys/class/backlight/" will show which backlight it is)

Is the machine in active use when it dims or at idle and does the screen
blank at the same time it dims? If so, does the keypress unblank the
screen (but not change the brightness)? 

Also, is this on a console or under something like X? 

Thanks,

Richard

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