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From: "Lu, Ran" <hephooey@gmail.com>
To: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 00/11] Enable gpu switching on the MacBook Pro
Date: Sat, 02 May 2015 14:03:24 -0500	[thread overview]
Message-ID: <mi371l$voi$1@ger.gmane.org> (raw)
In-Reply-To: 20150425142004.GA1108@wunner.de

Hi Lukas,

Lukas Wunner wrote:
> Included below is a tentative patch to set register 0x7F when switching
> the DDC lines. It would be great if someone with a retina could test
> the patchset I've posted plus this tentative patch since I can't test it
> myself.
> 
> * MacBookPro11 (second-gen retina):
>   The patchset I've posted plus the tentative patch below.
>   Fellow gmux hackers Andreas Heider and Bruno Bierbaumer tell me that
>   additionally, this patch is needed otherwise the i915 gpu is turned off:
>   https://www.marc.info/?l=grub-deavel&m=141586614924917&w=2

Thank you very much for your effort of bringing gpu switching to RMBP, I 
tried your patchset, including the one in this email, on my laptop. It is a 
Retina MacBookPro, late 2013 version, which is how ifixit calls it. It seems 
to work at least partially. Here is the results I observed.

First of all, I use gfxstatus in OSX to force the system to use the intel 
gpu. So when I boot into Linux the intel gpu will be activated and I can 
turn of the discrete nvidia gpu to save power.

After booted with the patched kernel (on top of v4.0). I can use "echo DIS > 
/sys/kernel/debug/vgaswitcheroo/switch" to switch to the nvidia gpu. The 
console turned black, I guess the system is incapable of switching to the 
nouveau's framebuffer at this moment. But after I startx through ssh, I can 
use everything without any problem. After quit the X the framebuffer is 
recovered as well. I can switch back to intel gpu and start X again no 
problem. However when I activated the discrete gpu again, I got a black 
screen after startx, the log of X seems normal, just no display on the 
screen.

I also tried to use the gfxstatus to resume the "normal" (dynamical 
switching) behavior in OSX. Then the nvidia gpu will be used when booting to 
linux. I switched to the intel gpu but it appears the gpu did not find the 
correct screen. After startx I got a black screen, xrandr does not give me 
the eDP output, only some Virtual and VGA outputs.

I hope these information can help to improve those patches. I am happy to 
try any (hopefully not dangerous) patches if you have any new ones.

-- 
Best Regards,
LR

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      reply	other threads:[~2015-05-02 20:40 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 ` [PATCH 00/11] Enable gpu switching on the MacBook Pro Matthew Garrett
2015-04-22 13:48   ` Lukas Wunner
2015-04-25 14:20   ` Lukas Wunner
2015-05-02 19:03     ` Lu, Ran [this message]

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