Created attachment 138173 [details] Xorg log Failed to start X Server on amdgpu driver stack OS: Ubuntu 18.04b1 Kernel: 4.15.0 I have hybrid AMD graphics in notebook. If I use "radeon" stack X works perfectly. But when I enable "amdgpu" stack X fails
I found the errors reason. A discrete graphics card dynamically turns off as unnecessary by driver, then the server can not initialize it. If you pass the parameter radeon/amdgpu.runpm=0 to the driver module, the server starts normally. Does X support dynamic power switching for GPUs? This state works: phoenix@phoenix-laptop:~$ sudo cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:01.0 1:DIS: :Pwr:0000:01:00.0 This state doesn't works: phoenix@phoenix-laptop:~$ sudo cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:01.0 1:DIS: :DynOff:0000:01:00.0
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