[Bug 211875] CPU frequency scaling lost after "WARNING: CPU: 2 PID: 2358578 at smu8_send_msg_to_smc_with_parameter+0xfe/0x140 [amdgpu]"

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211875

--- Comment #8 from Erhard F. (erhard_f at mailbox.org) ---
Created attachment 296273
  --> https://bugzilla.kernel.org/attachment.cgi?id=296273&action=edit
dmesg (kernel 4.14.228, A10-9700E)

Traced the issue back to kernel v4.14.228 which is still affected (v4.19.184
and v5.4.109 too). On v4.14.228 no stack trace like in recent kernels but these
messages:

[...]
[28541.868617] amdgpu: [powerplay] min_core_set_clock not set
[28542.483228] cz_send_msg_to_smc_async (0x0011) failed
[28543.097905] cz_send_msg_to_smc_async (0x026e) failed
[28543.712424] cz_send_msg_to_smc_async (0x002f) failed
[28543.712719] amdgpu: [powerplay] min_core_set_clock not set
[28544.330105] cz_send_msg_to_smc_async (0x0011) failed
[28544.947054] cz_send_msg_to_smc_async (0x026e) failed
[28545.564013] cz_send_msg_to_smc_async (0x002f) failed
[28545.564251] amdgpu: [powerplay] min_core_set_clock not set
[28546.179695] cz_send_msg_to_smc_async (0x0011) failed
[28546.794880] cz_send_msg_to_smc_async (0x026e) failed
[28547.409986] cz_send_msg_to_smc_async (0x002f) failed

Apart from that the machine behaves the same after these
"cz_send_msg_to_smc_async (0x002f) failed" - CPU permanently downclocked to 800
MHz, desktop 'freezing' issues with display going black after some time. Access
via ssh still works.

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