Ubuntu
linux package

  1. Bug #1690085
  2. Comment #651

Comment 651 for bug 1690085

Revision history for this message
In , to_load (toload-linux-kernel-bugs) wrote :

(In reply to alfie from comment #561)
> This is pretty strange, could someone explain it to me? Wasn't mwait bugged
> in ryzen?

Looks like this patch makes kernel to ignore BIOS messages about unsupported C-state.
this function used in "acpi_processor_ffh_cstate_probe" which further used in "processor_idle.c" file. It cause "cx.entry_method" value change from ACPI_CSTATE_SYSTEMIO to ACPI_CSTATE_FFH.

It is really strange that this patch works but idle=halt is not. Maybe this is somehow silently disables C6 state.
Can your system reach turbo frequencies with this patch?
Maybe I understand something wrongly...