** Changed in: linux-oem-6.14 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2091847
Title:
[SRU] Prefer BIOS over PMF on some AMD platforms
Status in HWE Next:
New
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.14 package in Ubuntu:
Invalid
Status in linux-oem-6.11 source package in Noble:
Fix Released
Status in linux-oem-6.14 source package in Noble:
Fix Released
Bug description:
[ Impact ]
Some AMD platforms prefer letting BIOS handling what are supposed to
be done by the PMF kernel driver. On those platforms, the BIOS should
take full control over the relevant functions, without the
interference from the PMF driver. To achieve this, add quirks that
make the PMF driver fail to probe on those platforms.
[ Test Plan ]
1. Install the kernel on one of those platforms.
2. Boot into the kernel.
3. Check dmesg. It should show "Platform prefers BIOS over PMF module. Finish
PMF driver probe early."
[ Where problems could occur ]
If the quirk matches the wrong platform, PMF driver will not function.
[ Other Information ]
Simply making the driver fail to probe would suffice. This is because
BIOS detects the presence of the PMF driver by detecting regular
heartbeat signal sent from the driver. If BIOS detects no such
heartbeats, it'll consider the PMF driver missing, and will
automatically take over the relevant functions.
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