From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Lukas Wunner <lukas@wunner.de>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
Seth Forshee <seth.forshee@canonical.com>,
dri-devel@lists.freedesktop.org, Dave Airlie <airlied@redhat.com>
Subject: Re: [PATCH 00/11] Enable gpu switching on the MacBook Pro
Date: Tue, 21 Apr 2015 20:49:35 +0100 [thread overview]
Message-ID: <20150421194935.GA13517@srcf.ucam.org> (raw)
In-Reply-To: <cover.1429610300.git.lukas@wunner.de>
On Tue, Apr 21, 2015 at 11:58:20AM +0200, Lukas Wunner wrote:
> On MBPs, the panel is not connected to one of the gpus, but to the
> gmux chip (the "handler" in vga_switcheroo speak). Initially the gmux
> is switched to the discrete gpu. The integrated i915 gpu is therefore
> unable to detect the LVDS (or eDP) connector on bootup and switching
> to the integrated gpu will lead to a black screen. The solution is
> to temporarily switch the DDC lines to the integrated gpu when reading
> the EDID, which the gmux is capable of. Lack of support for this in
> vga_switcheroo is pretty much the only obstacle to get gpu switching
> to work on MBPs.
My testing suggested that changing the DDC lines didn't change auxch, so
this approach doesn't work for eDP. Have you found otherwise?
--
Matthew Garrett | mjg59@srcf.ucam.org
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next prev parent reply other threads:[~2015-04-21 19:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-21 9:58 [PATCH 00/11] Enable gpu switching on the MacBook Pro Lukas Wunner
2012-09-07 15:22 ` [PATCH 01/11] vga_switcheroo: Add support for switching only the DDC Lukas Wunner
2012-09-07 15:22 ` [PATCH 02/11] vga_switcheroo: Add helper function to get the active client Lukas Wunner
2012-09-07 15:22 ` [PATCH 03/11] apple-gmux: Add switch_ddc support Lukas Wunner
2012-09-07 15:22 ` [PATCH 04/11] drm/edid: Switch DDC when reading the EDID Lukas Wunner
2012-12-22 2:52 ` [PATCH 05/11] vga_switcheroo: Lock/unlock DDC lines Lukas Wunner
2014-03-05 22:34 ` [PATCH 09/11] apple-gmux: Assign apple_gmux_data before registering Lukas Wunner
2015-03-27 11:29 ` [PATCH 06/11] vga_switcheroo: Lock/unlock DDC lines harder Lukas Wunner
2015-04-19 15:01 ` [PATCH 10/11] drm/i915: Reprobe connectors if vga_switcheroo handler registers late Lukas Wunner
2015-04-21 11:50 ` Chris Wilson
2015-04-21 12:16 ` Lukas Wunner
2015-04-21 12:37 ` Chris Wilson
2015-04-19 15:18 ` [PATCH 11/11] drm/nouveau: Pause between setting gpu to D3hot and cutting the power Lukas Wunner
2015-04-20 10:08 ` [PATCH 08/11] vga_switcheroo: Reprobe connectors if handler registers late Lukas Wunner
2015-04-21 8:39 ` [PATCH 07/11] Revert "vga_switcheroo: Add helper function to get the active client" Lukas Wunner
2015-04-21 19:49 ` Matthew Garrett [this message]
2015-04-22 13:48 ` [PATCH 00/11] Enable gpu switching on the MacBook Pro Lukas Wunner
2015-04-25 14:20 ` Lukas Wunner
2015-05-02 19:03 ` Lu, Ran
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