From: Lukas Wunner <lukas@wunner.de>
To: Alex Deucher <alexdeucher@gmail.com>
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: [Intel-gfx] [PATCH v5 00/12] Enable GPU switching on pre-retina?MacBook Pro
Date: Tue, 15 Mar 2016 18:54:36 +0100 [thread overview]
Message-ID: <20160315175436.GA27849@wunner.de> (raw)
In-Reply-To: <CADnq5_OZ_0m7yzr5Dy++qLQ1kL-AZmVwCE6K6A3z1FKfhXy0pQ@mail.gmail.com>
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).
> > 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.
> 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.
Best regards,
Lukas
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next prev parent reply other threads:[~2016-03-15 17:54 UTC|newest]
Thread overview: 48+ 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 07/12] drm/nouveau: Switch DDC when reading the EDID 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 10/12] drm/i915: " 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 01/12] vga_switcheroo: Add handler flags infrastructure Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 04/12] apple-gmux: Add switch_ddc support Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 05/12] drm/edid: Switch DDC when reading the EDID Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 09/12] apple-gmux: Add helper for presence detect Lukas Wunner
2016-01-11 19:09 ` [PATCH v5 06/12] drm/i915: Switch DDC when reading the EDID 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 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 03/12] apple-gmux: Track switch state 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
2016-03-04 16:12 ` Bastien Nocera
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 [this message]
2016-03-15 18:33 ` Alex Deucher
2016-03-15 20:41 ` Lukas Wunner
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