(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... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1690085 Title: Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1690085/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
