Making the discrete AMD GPU the default GPU in a Mux-less setup with an integrated Intel GPU in Mint 18 (Xenial)

[Yu, Qiang]

1.18.3 is OK. And I use Ubuntu 16.04.

The RenderPath and RenderDriver are necessary for modesetting
to select a different render GPU than the display GPU.

Regards,
Qiang
________________________________________
From: Ryan Ross <lightknight.rr at gmail.com>
Sent: Friday, July 22, 2016 1:43:01 PM
To: Yu, Qiang; xorg-driver-ati at lists.x.org
Subject: Re: Making the discrete AMD GPU the default GPU in a Mux-less setup with an integrated Intel GPU in Mint 18 (Xenial)

Greetings Qiang,

What version of X are you using? I've built my own with what Mint
currently is offering, which is apparently 1.18.3, but it seems to be
behind whatever you are using. I'll have the full source (with the
modifications) available for you as soon as DropBox finishes synching
everything with my laptop (went with a clean install, it may be a few
hours...). Until then, I've attached the Xorg.log, if you're interested.

For whatever reason it did not care for the "RenderPath" and
"RenderDriver" sections.

Ah, and one line needed to be added 'driver.c' to get it to compile:
"#include <gbm.h>". Aside from that, once all dependencies were
satisfied, it compiled well.

Many Thanks,
Ryan



On 07/21/2016 05:02 AM, Yu, Qiang wrote:
> Hi Ryan,
>
> That's interesting. I also want to do this but in another way:
> one modesetting DDX display on iGPU and render on dGPU
>
> Attach the prototype patch and the xorg.conf should be
>
> Section "ServerFlags"
>          Option  "AutoAddGPU" "off"
> EndSection
>
> Section "Device"
>          Identifier "Intel"
>          Driver "modesetting"
>          Option "RenderPath" "radeon"
>          Option "RenderDriver" "radeonsi"
> EndSection
>
> Regards,
> Qiang
>
> ________________________________________
> From: xorg-driver-ati <xorg-driver-ati-bounces at lists.x.org> on behalf of Ryan Ross <lightknight.rr at gmail.com>
> Sent: Thursday, July 21, 2016 11:49:32 AM
> To: xorg-driver-ati at lists.x.org
> Subject: Making the discrete AMD GPU the default GPU in a Mux-less setup with an integrated Intel GPU in Mint 18 (Xenial)
>
> Greetings,
>
> I have a Toshiba Satellite P55T-B5340 that I am attempting to persuade
> to boot X using the discrete GPU, and only the discrete GPU. It's been a
> lot of fun, because it's muxless (no hardware switch, vgaswitcharoo
> seems only to crash it), and the GPU I want to use has no dedicated
> outputs (and so, somehow, has to steal them from the integrated GPU,
> using magic from what I can tell...). I've attempted to adapt the Nvidia
> approach, which sadly only appears to work for glxinfo; attempts to use
> "modesetting", screens, and AllowEmptyInitialConfiguration appear to
> have no (positive) effect on X, as it really wants this GPU to be hooked
> up to some form of output (or it will unload the module). On the upside,
> the discrete GPU is quite happy with the 'radeon' driver.
>
> Additional Information:
>
> The iGPU is an Intel HD 4600 Graphics (CPU is a i7-4710HQ).
> The dGPU is an AMD/ATI Venus Pro (Radeon HD 8850M / R9 M265X).
>
> Output from xrandr --listproviders is as follows:
> Providers: number : 3
> Provider 0: id: 0x6d cap: 0x9, Source Output, Sink Offload crtcs: 4
> outputs: 4 associated providers: 2 name:Intel
> Provider 1: id: 0x45 cap: 0x6, Sink Output, Source Offload crtcs: 6
> outputs: 0 associated providers: 2 name:VERDE @ pci:0000:01:00.0
> Provider 2: id: 0x45 cap: 0x6, Sink Output, Source Offload crtcs: 6
> outputs: 0 associated providers: 2 name:VERDE @ pci:0000:01:00.0
>
> Pages I've  looked at, solutions I've tried:
>
> https://wiki.archlinux.org/index.php/PRIME
> https://www.mankier.com/5/xorg.conf#Outputclass_Section
> http://us.download.nvidia.com/XFree86/Linux-x86/364.15/README/randr14.html
>
> and a search through both Google and this greater mailing list for
> 'discrete gpu', finding some interesting stuff, but nothing applicable.
>
> Has anyone some magic glitter to spare, or perhaps some working
> knowledge of how I might get this beast into the proper configuration?
>
> Many Thanks,
> Ryan
>
>
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