Tested on one of the said AMD platforms. Boot into the platform and the PMF driver probe function will return early as expected, showing the expected message in the kernel log.
** Summary changed: - Prefer BIOS over PMF on some AMD platforms + [SRU] Prefer BIOS over PMF on some AMD platforms ** Tags removed: verification-needed-noble-linux-oem-6.11 ** Tags added: verification-done-noble-linux-oem-6.11 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-6.11 in Ubuntu. 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: New Status in linux-oem-6.11 source package in Noble: Fix Committed 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. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2091847/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
