https://bugzilla.kernel.org/show_bug.cgi?id=211875
--- Comment #8 from Erhard F. (erhard_f@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.