[SOLVED] 10 sec boot and shutdown delays with AMDGPU device

[Goverp]

Since I installed a Radeon RX570 graphics card and got the AMDGPU driver working, I've had annoying 10 sec delays, when booting and shutdown, and when switching sessions between tty7 and tty 8. Dmesg shows the driver trying to send a series of amdgpu powerplay commands and failing, along the following lines:

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[13842.569209] amdgpu: [powerplay]
                failed to send message 171 ret is 0 

I found the hangs and messages disappear set the amdgpu module parameter dpm=0, either with a /etc/modprobe.d entry along the lines:

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options amdgpu dpm=0

or the command line parameter

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amdgpu.dpm=0

I don't know if it's disabling something important or not. Xorg.0.log shows

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[    22.232] (II) AMDGPU(0): DPMS capabilities: Off
[    22.535] (==) AMDGPU(0): DPMS enabled
[    22.547] (II) Initializing extension DPMS

but I'm not sure if DPMS (Energy Star power saving) is the same thing as dpm.

I found an intriguing reference that said on old cards and kernels dpm=1 enabled the new dpm; then when AMD power play came out, they swapped its definition and dpm=0 would select power play and dpm=1 would still select the old power management, which might explain the problem.

[TigerJr]

What kernel are you use?

[Goverp]

AFAIR kernel 5.1.12 (I'm on a different box just now)

[TigerJr]

im using 5.0.18 and amdgpu drivers, but those message in kernel log doesn't appear