On 2019/5/7 下午5:16, Michel Dänzer wrote: > 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
This works like a charm! The only extra thing I need to do is creating a small script for lightdm display-setup-script to generate Xorg.conf according to whether the eGPU is present. As the BusID doesn't work well if eGPU is not present, X will refuse to start and require all framebuffer devices to be specified. Thanks, Qu > > > 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 > >
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