Date: Tue, 4 Oct 2005 14:03:34 +0200
From: Pavel Machek <pavel@suse.cz>
To: Timo Hoenig <thoenig@suse.de>
Cc: Stefan Seyfried <seife@suse.de>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       kernel list <linux-kernel@vger.kernel.org>
Subject: Re: thinkpad suspend to ram and backlight
Message-ID: <20051004120334.GE17458@elf.ucw.cz>
References: <20051002175703.GA3141@elf.ucw.cz> <43410149.9070007@suse.de> <1128427214.14551.15.camel@nouse.suse.de>
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Hi!

> > > When I suspend to RAM on x32, backlight is not turned off. (And, IIRC,
> > > video chips is not turned off, too). Unfortunately, backlight is not
> > > turned even when lid is closed. I know some patches were floating
> > > around to solve that... but I can't find them now. Any ideas?
> > 
> > Which framebuffer driver? Vesafb works for Timo, at least he did not
> > complain lately ;-)
> 
> It's never too late to complain: I just gave it a try with vesfb.
> Backlight stays on.
> 
> When eying the display precisely it seems to be switched off for a short
> moment once the system enters S3 but then gets turned on again.

Yes, same with radeonfb here.

I use

#!/bin/bash
radeontool light off
echo 3 > /proc/acpi/sleep
radeontool light on

...and it works most of the time. Sometimes screen is corrupted after
resume, another suspend/resume cycle cures that. (Strange!)

								Pavel
-- 
if you have sharp zaurus hardware you don't need... you know my address
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