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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='jo6crb$qpl$1@dough.gmane.org' \
--to=bon@elektron.ikp.physik.tu-darmstadt.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.