Ubuntu
linux-oracle-5.15 package

  1. Bug #2011854
  2. Comment #4

Comment 4 for bug 2011854

Revision history for this message
Cory Todd (corytodd) wrote :

The core issue is that with f2a7f3238777, the kernel on the affected systems no longer uses hpet for the rtc alarm and update interrupts. This may indicate that their non-hpet implementation is faulty. By removing the ACPI_FADT_LOW_POWER_S0 check from use_acpi_alaram_quirks, the kernel expects to use the acpi alarm by way of use_hpet_alarm().

Other facts:
- this patch has only been applied to Jammy. Kinetic and Focal do not have the latest patches affecting rtc-cmos.
- applying these patches to jammy:linux-gcp work correctly on a g1-small instance. This system is able to use the acpi alarm for both alarm and update interrupts.

I see two options:

1) Revert f2a7f3238777 as a SAUCE patch. The justification for this commit seems to be based on the suspend-to-idle use case, notwithstanding the alarm from S0 use case.
2) Patch in a more specific quirk and get it upstreamed. It seems like the quirk that was removed was hiding a bug on this particular system.