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After update to Gnome 3.26.1 there is a new problem with my external screen connected with HDMI. Turning the external screen off and turning on again causes the GDM login screen to appear. When I log in again there are no longer my Gnome session vision (it has gone). None of the programs previously opened and associated with the old Gnome session are accessible, only GDM username/password prompt is visible. Logging in causes a new Gnome session to appear. Same thing happens when I use a HDMI switch: the session is gone when I switch back to that PC. Nothing is visible in journalctl and same thing happens with both radeon driver and amdgpu driver.
Last edited by beoldhin (2017-10-09 17:29:41)
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Problem solved. Selecting either amdgpu or radeon driver and blacklisting the other one no longer works in Wayland mode. As a solution I installed Arch from scratch today and loading only one driver causes Arch to not boot up (hangs before GDM). It works only if I don't specify anything and that way Gnome is also very fast (however lsmod still shows that both amdgpu and radeon modules are loaded). Also neither xf86-video-ati nor xf86-video-amdgpu are currently installed and everything seems to work fine and fast after installing from scratch.
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use below kernel mode settings in grub you can load radeon and/or amdgpu
radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1 amdgpu.cik_support=1
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