From: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drivers:gpu:vga_switcheroo: Work around dramatic power drain in laptops
Date: Sun, 6 May 2012 17:36:43 +0000 (UTC) [thread overview]
Message-ID: <jo6crb$qpl$1@dough.gmane.org> (raw)
In-Reply-To: CAMChaFwhgrQN864=q6-dKD=b8y9=1HJL+qpdSHFn4ts2rW7omA@mail.gmail.com
Alexander Tarasikov <alexander.tarasikov@gmail.com> wrote:
> 2012/4/29 Alan Cox <alan@lxorguk.ukuu.org.uk>:
> > The module parameter is probably the wrong long term option. Do you know
> > if the problem is general or specific to some laptops. If it's the latter
> > then it might also be worth implementing a DMI and/or PCI detection
> > routine to match the laptops you know are afflicted and automatically
> > enabled it.
> > Alan
> I agree that module parameter is not a good idea, but I have seen a
> lot of reports of the problem and no patches were proposed,
> so I tried to do what I could. It
> could be a good temporary solution until we make sure it does not break
> any configurations. I am unsure how muxless/muxed cards may differ in
> behaviour.
> I suspect that the problem is specific to all laptops with
> intel+radeon combination.
Intel+Nvidia combination seems to be affected too!
> So far I have found these reports of radeon eating battery
> [2010] Acer TravelMate Timeline 8371
> [2012] Hp Envy 14 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/909337
> [2012] Thinkpad T400 https://bbs.archlinux.org/viewtopic.php?id=133329
> [2012] Sony Vaio SE15 (VPCSE1v9E)
> http://blog.ejbca.org/2012/02/ubuntu-gnulinux-1204-precise-on-sony.html
I can confirm the problem with an intel+nvidia combination, on a Thinkpad T520:
> lspci |grep -i VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core \
Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: nVidia Corporation GF119 [Quadro NVS 4200M] (rev ff)
I suspend with "DIS"cret graphics off. Resuming comes up with about 5 Watt
more power drain compared before suspend. Switching "DIS" needs another 5
Watt. Switching "DIS" off again brings me back to the power drain level
before suspend.
I vote for Alexander proposal!
Bye
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
next prev parent reply other threads:[~2012-05-06 17:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-28 20:45 [PATCH] drivers:gpu:vga_switcheroo: Work around dramatic power drain Alexander Tarasikov
2012-04-28 20:45 ` [PATCH] drivers:gpu:vga_switcheroo: Work around dramatic power drain in laptops Alexander Tarasikov
2012-04-28 21:10 ` Alan Cox
2012-04-28 22:17 ` Alexander Tarasikov
2012-05-06 17:36 ` Uwe Bonnes [this message]
2012-07-03 1:55 ` Valery Pipin
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