From: Alex Deucher <alexdeucher@gmail.com>
To: Lukas Wunner <lukas@wunner.de>
Cc: Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
Maling list - DRI developers <dri-devel@lists.freedesktop.org>,
Bastien Nocera <hadess@hadess.net>
Subject: Re: [PATCH v5 00/12] Enable GPU switching on pre-retina?MacBook Pro
Date: Tue, 15 Mar 2016 14:33:56 -0400 [thread overview]
Message-ID: <CADnq5_Mu7naFnJdGAeDheATb6PXUbzu+Bb-zAb5ij6jiSOUwFw@mail.gmail.com> (raw)
In-Reply-To: <20160315175436.GA27849@wunner.de>
On Tue, Mar 15, 2016 at 1:54 PM, Lukas Wunner <lukas@wunner.de> wrote:
> Hi Alex,
>
> On Sat, Mar 05, 2016 at 01:10:56PM -0500, Alex Deucher wrote:
>> Is there any reason to make use of the mux?
>
> Performance (lower latency => no need for framebuffer writes over PCIe),
> improved battery life (no need to use 2 GPUs simultaneously).
>
> Technically you can't just ignore that the mux is there on the MBP
> because the kernel has no control over the GPU used on boot.
> (It's determined by EFI).
>
Is GPU power switching also handled by the mux? Is it independent of
the display mux?
>
>> > I've heard that the AMD GPU is picky about external monitors and
>> > doesn't recognize them unless they're plugged in at exactly the
>> > right moment, so you may need to retry a couple of times until it
>> > works.
>>
>> Are talking about some issue specific to these muxed apple systems or
>> in general?
>
> Feedback I got from William Brown of Red Hat who tested the GPU switching
> patches on an MBP8,2 and reported that (independently of the patches),
> a display connected with an original Apple DP-to-DVI adapter would only
> be recognized if plugged in at exactly the right moment and in the correct
> order (first adapter, then display). However it doesn't seem to work
> better on OS X.
Sounds like a issue with their adapter.
>
>
>> If you are having issues, please file a bug.
>
> I'm not having issues so can't file a bug. Besides, filing a bug is no
> guarantee that things get fixed. He had opened a bug for GPU switching
> 3 years ago (https://bugs.freedesktop.org/show_bug.cgi?id=61115) and
> nobody did a thing. Obviously whether something gets fixed is a function
> of the perceived importance by maintainers, unless a volunteer comes
> along and does the dirty work.
Well, of course everyone is busy and developers will prioritize
issues. However, bugs that are not reported have substantially less
chance of getting fixed.
Alex
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next prev parent reply other threads:[~2016-03-15 18:33 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-11 19:09 [PATCH v5 00/12] Enable GPU switching on pre-retina MacBook Pro Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 11/12] drm/nouveau: Defer probe if gmux is present but its driver isn't Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 08/12] drm/radeon: Switch DDC when reading the EDID Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 06/12] drm/i915: " Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 10/12] drm/i915: Defer probe if gmux is present but its driver isn't Lukas Wunner
2016-02-09 9:04 ` Daniel Vetter
2016-02-14 12:10 ` Lukas Wunner
2016-02-14 12:46 ` Daniel Vetter
2016-02-16 15:58 ` Lukas Wunner
2016-02-16 16:08 ` Daniel Vetter
2016-02-18 20:34 ` Lukas Wunner
2016-02-18 21:39 ` Daniel Vetter
2016-02-18 22:20 ` Lukas Wunner
2016-02-18 23:11 ` Daniel Vetter
2016-02-18 23:53 ` Deucher, Alexander
2016-01-11 19:09 ` [PATCH v5 04/12] apple-gmux: Add switch_ddc support Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 03/12] apple-gmux: Track switch state Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 02/12] vga_switcheroo: Add support for switching only the DDC Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 12/12] drm/radeon: Defer probe if gmux is present but its driver isn't Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 07/12] drm/nouveau: Switch DDC when reading the EDID Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 05/12] drm/edid: " Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 01/12] vga_switcheroo: Add handler flags infrastructure Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 09/12] apple-gmux: Add helper for presence detect Lukas Wunner
[not found] ` <cover.1452525860.git.lukas-JFq808J9C/izQB+pC5nmwQ@public.gmane.org>
2016-02-01 22:49 ` [PATCH v5 00/12] Enable GPU switching on pre-retina MacBook Pro Lukas Wunner
2016-02-02 1:10 ` Dave Airlie
2016-02-02 1:19 ` Dave Airlie
2016-02-02 15:03 ` Lukas Wunner
[not found] ` <20160201224944.GA12944-JFq808J9C/izQB+pC5nmwQ@public.gmane.org>
2016-02-02 6:33 ` Pierre Moreau
2016-02-08 18:10 ` Darren Hart
[not found] ` <20160208181000.GL1779-Z5kFBHtJu+EzCVHREhWfF0EOCMrvLtNR@public.gmane.org>
2016-02-09 9:01 ` Daniel Vetter
[not found] ` <loom.20160304T170007-454@post.gmane.org>
2016-03-05 14:16 ` [Intel-gfx] [PATCH v5 00/12] Enable GPU switching on pre-retina?MacBook Pro Lukas Wunner
2016-03-05 16:31 ` Bastien Nocera
2016-03-09 23:30 ` Dave Airlie
2016-03-10 15:29 ` Bastien Nocera
2016-03-10 15:33 ` Bastien Nocera
2016-03-14 12:41 ` [Intel-gfx] " Lukas Wunner
2016-03-14 13:37 ` Bastien Nocera
2016-03-15 7:51 ` Daniel Vetter
2016-03-15 11:10 ` [Intel-gfx] " Dave Airlie
2016-03-15 11:55 ` Bastien Nocera
2016-04-05 16:59 ` Bastien Nocera
2016-04-05 17:43 ` Lukas Wunner
2016-03-05 17:28 ` [Intel-gfx] " Bastien Nocera
2016-03-05 18:10 ` Alex Deucher
2016-03-15 17:54 ` Lukas Wunner
2016-03-15 18:33 ` Alex Deucher [this message]
2016-03-15 20:41 ` Lukas Wunner
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=CADnq5_Mu7naFnJdGAeDheATb6PXUbzu+Bb-zAb5ij6jiSOUwFw@mail.gmail.com \
--to=alexdeucher@gmail.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=hadess@hadess.net \
--cc=intel-gfx@lists.freedesktop.org \
--cc=lukas@wunner.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).