[Bug 2155492] Re: [resolute] Fix bug in VPE collaborate mode on Strix Halo

** Tags added: kernel-daily-bug -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2155492 Title: [resolute] Fix bug in VPE collaborate mode on Strix Halo Status in linux package in Ubuntu: Fix Released Status in linux source package in Resolute: Triaged Bug description: [Impact] Strix Halo has two VPE IP blocks. Mesa has the capability to utilize both blocks in tandem in something called "Collaborate Mode". Newer versions of Mesa will utilize VPE as part of the hardware decode pipeline (for example for scaling). There are reports that Mesa 26.0.5 can expose a race condition with VPE collaborate mode and power gating that could lead to a system hang. Resolute has mesa 26.0.3, but there is a separate SRU to backport 26.0.8 to resolute for 26.04.1, and backported to noble for 24.04.5. Furthermore as mesa is contained within snaps it's plausible that an uprev in a snap can expose it too. There is a workaround for this that forces a SYNC command before power gating that avoids the issue. https://github.com/torvalds/linux/commit/b6074630a461b1322a814988779005cbc43612ea This is needed in resolute 7.0 and backported to noble as hwe-7.0. [Test case] TBF [Where things could go wrong] If the mesa update lands first, affected systems can suffer from hangs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2155492/+subscriptions