https://bugzilla.kernel.org/show_bug.cgi?id=218525 --- Comment #9 from Mika Westerberg (mika.westerberg@xxxxxxxxxxxxxxx) --- Okay I see a couple of things from HW side that may affect (or may not). First is that the real PCIe link to the 06:00 eGPU device is running on limited bandwidth: LnkSta: Speed 5GT/s (downgraded), Width x4 (downgraded) TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- I don't know why this is but it could be that the graphics driver tunes this because it finds the virtual links only supporting gen 1 speeds. However, this is not true, the virtual PCIe links over Thunderbolt can get up to 90% of the 40G link if there is no other tunneling (such as DisplayPort). The second thing is that there is ASPM L1 enabled on this same real PCIe link: LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- I suggest trying to disable it. Passing something like "pcie_aspm.policy=performance" should make the above to turn into ASPM disabled or so. Also I suggest experimenting to disable IOMMU (pass intel_iommu=off in the kernel command line). -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
