From: Dave Airlie <airlied@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Takashi Iwai <tiwai@suse.de>
Subject: Re: [RFC] drm dynamic power off support
Date: Mon, 10 Sep 2012 15:04:02 +1000 [thread overview]
Message-ID: <CAPM=9twAbBNovDZno2d_rg9Ga7hO60inJkDtC=OFpAF-Voecew@mail.gmail.com> (raw)
In-Reply-To: <1347251515-10136-1-git-send-email-airlied@gmail.com>
On Mon, Sep 10, 2012 at 2:31 PM, Dave Airlie <airlied@gmail.com> wrote:
> For optimus and powerxpress setups where we can explicitly power off
> the GPU I'd like to do this under control of the driver. Now that I've
> added X server support for secondary GPUs, it makes sense to start
> powering them down more often if we can.
>
> I've tested this code on two laptops, one intel/nouveau one intel/radeon
> It works, powertop says I use 5-6W less power.
>
> Caveats:
> There is a race at X server start with platform probing code, if
> the secondary device is off, we the wrong PCI info for it, I've
> got a patch that works around this I'll send to the xorg-devel.
>
> Audio seems to get screwed at least on one machine, we power up
> and the alsa callbacks into snd_hda_intel get called but it can't
> find the hw properly, need to investigate a bit further.
>
> Dave.
>
Hi Takashi,
just wondering how well setup alsa would be for the dGPU powering
up/down a lot more often,
139.529103] nouveau [ DRM][0000:01:00.0] resuming display...
[ 139.833960] ALSA sound/pci/hda/hda_intel.c:2533 Enabling
0000:01:00.1 via VGA-switcheroo
[ 139.844789] snd_hda_intel 0000:01:00.1: Refused to change power
state, currently in D3
[ 139.915760] snd_hda_intel 0000:01:00.1: Refused to change power
state, currently in D3
[ 140.917437] ALSA sound/pci/hda/hda_intel.c:813 spurious response
0x0:0x3, last cmd=0x301f0500
[ 140.917449] ALSA sound/pci/hda/hda_intel.c:813 spurious response
0x0:0x3, last cmd=0x301f0500
[ 140.917455] ALSA sound/pci/hda/hda_intel.c:813 spurious response
0x0:0x3, last cmd=0x301f0500
[ 140.917460] ALSA sound/pci/hda/hda_intel.c:813 spurious response
0x0:0x3, last cmd=0x301f0500
[ 140.917465] ALSA sound/pci/hda/hda_intel.c:813 spurious response
0x0:0x3, last cmd=0x301f0500
is just some of the things I see, if I turn off before snd_hda_intel,
things go badly wrong when
I do power up the dGPU, if I delay the power off until audio is
loaded, I start to see wierd things when pulseaudio starts when the
dGPU is off.
Dave.
next prev parent reply other threads:[~2012-09-10 5:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-10 4:31 [RFC] drm dynamic power off support Dave Airlie
2012-09-10 4:31 ` [PATCH 1/5] gpu/vga_switcheroo: add driver control power feature Dave Airlie
2012-09-10 4:31 ` [PATCH 2/5] drm: Add initial dnyamic power off feature Dave Airlie
2012-09-10 7:18 ` Daniel Vetter
2012-09-10 8:23 ` Dave Airlie
2012-09-10 8:36 ` Chris Wilson
2012-09-10 10:55 ` Alan Cox
2012-09-10 9:00 ` Daniel Vetter
2012-09-10 11:07 ` Alan Cox
2012-09-10 11:16 ` Dave Airlie
2012-09-10 4:31 ` [PATCH 3/5] nouveau: Add interface to detect optimus support Dave Airlie
2012-09-10 16:25 ` Lekensteyn
2012-09-10 20:24 ` Dave Airlie
2012-09-10 4:31 ` [PATCH 4/5] nouveau: add dynamic gpu power off support Dave Airlie
2012-09-10 16:30 ` Peter Wu
2012-09-10 4:31 ` [PATCH 5/5] radeon: add dynamic " Dave Airlie
2012-09-10 5:04 ` Dave Airlie [this message]
2012-09-10 8:47 ` [RFC] drm " Takashi Iwai
2012-09-10 8:50 ` Dave Airlie
2012-09-11 13:32 ` Takashi Iwai
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