Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Leo Lin (0xff07)
Status: New
** Affects: linux-oem-7.0 (Ubuntu)
Importance: Undecided
Assignee: Leo Lin (0xff07)
Status: New
** Tags: originate-from-2163510
** Changed in: linux-oem-7.0 (Ubuntu)
Assignee: (unassigned) => Leo Lin (0xff07)
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
+ 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.
** Tags added: originate-from-2163510
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Leo Lin (0xff07)
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https://bugs.launchpad.net/bugs/2165889
Title:
[SRU] Fix issues with dGPUs in eGPU enclosure
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