[Bug 2165889] Re: [SRU] Fix issues with dGPUs in eGPU enclosure

** 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/2165889 Title: [SRU] Fix issues with dGPUs in eGPU enclosure Status in linux package in Ubuntu: New Status in linux-oem-7.0 package in Ubuntu: New Bug description: BugLink: https://bugs.launchpad.net/bugs/2165889 [ Impact ] We found when some AMD eGPUs are connected via thunderbolt (thus through PCIe tunneling), pure compute workload via ROCm won't launch without also connecting the said eGPU to a display. This is due to mismatched expectation from runtime PM when dGPU is not connected to root port but is instead external. [ Fix ] Cherry-pick the following commit, which is currently in 7.3-rc1 (c52feb436539): - drm/amdgpu: Disable runtime PM for externally attached dGPUs [ Test plan ] - Connect the eGPU with thunderbolt - Without connecting the eGPU to any display, launch compute workload with ROCm - The workload should run. [ Where problems could occur ] This impacts runtime power management behavior for GPUs connected externally via thunderbolt. This in theory doesn't impact dGPUs and iGPUs. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2165889/+subscriptions