T480S Heads firmware lack ACPI P-state tables.
Nobody has claimed this yet.
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Description
Without commit 91173, T480S systems running Heads firmware lack ACPI P-state tables. This primarily affects:
Xen hypervisor frequency scaling (the original reported issue)
Operating systems that rely on ACPI _PSS/_PCT/_PPC tables for CPU power management
outlined here: https://ticket.coreboot.org/issues/623
Fix availble: https://review.coreboot.org/c/coreboot/+/91173
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with commit 91173 and the linked coreboot review, then read the issue at coreboot ticket 623 for the original context. Confirm how the fix applies to T480S Heads firmware and verify that ACPI P-state tables are present for Xen and operating systems relying on _PSS, _PCT, and _PPC.
Written by the indexing model from the issue text.
Assessment
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100