On 2019-05-05 3:06 a.m., Qu Wenruo wrote: > On 2019/4/29 下午10:11, Michel Dänzer wrote: >> On 2019-04-29 3:04 p.m., Qu Wenruo wrote: >> >>> Is it possible to disable Intel one completely at X start time? >>> >>> Just regular xorg.conf.d with amdgpu only device section? >> >> Sure, but then you won't be able to power down the AMD GPU while Xorg is >> running (or at least while it's active). > > Considering current kernel eGPU support, hot unplug is impossible as it > will panic the amdgpu module, so it's not a big deal.
FWIW, another possible gotcha is that DRI_PRIME=1 will result in apps
using the Intel GPU for rendering then.
> While the bigger problem is the config. As normally Xorg auto detect is
> good enough and user needs no extra config.
>
> But with such eGPU setup, if only have 10-amdgpu.conf and 20-intel.conf,
Unless you've modified it, 10-amdgpu.conf just instructs Xorg to use the
xf86-video-amdgpu driver for any devices controlled by the amdgpu kernel
driver by default; it doesn't affect which GPU Xorg uses as primary.
Where is 20-intel.conf from, and what does it contain?
The xorg.conf.d mechanism is for shipping configuration snippets in
packages. For user configuration, /etc/X11/xorg.conf should be used.
> without screen specification, X will not start due to failure to find
> screen.
>
> I'm wondering what's the correct way to specify all the needed config.
> to make X work with, and without eGPU.
This should be all you need to choose the primary GPU:
Section "Device"
Identifier "AnythingYouLike"
BusID "PCI:<as printed in Xorg log file, e.g. 34@0:0:0>"
EndSection
If you don't want Xorg to use the non-primary GPU at all (it can still
be used via DRI3), add
Section "ServerFlags"
Option "AutoAddGPU" "off"
EndSection
--
Earthling Michel Dänzer | https://www.amd.com
Libre software enthusiast | Mesa and X developer
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