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

[Ryan Ross]

Ah, and your configuration works? I'll have to look closer into the 
difference between Ubuntu and Mint.

As promised, here are the files:
The log file (again):
https://www.dropbox.com/s/cqklcqjn18aer3m/Xorg.0.log?dl=0
And the build-source files:
https://www.dropbox.com/s/itt8nbh7rs9lmz6/xorg-build.tar.bz2?dl=0

Thanks,
Ryan

On 07/22/2016 02:15 AM, Yu, Qiang wrote:
> 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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