The setpci commands I used modified the LnkCtl option but not the LnkCap values. I'm not sure but suspect that the LnkCap values are what are causing the problem.
-- LnkCap: Port #17, Speed 8GT/s, Width x4, ASPM not supported, Exit Latency L0s <1us, L1 <16us ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+ LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkCap: Port #7, Speed 8GT/s, Width x1, ASPM not supported, Exit Latency L0s <1us, L1 <16us ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+ LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- vs LnkCap: Port #17, Speed 8GT/s, Width x4, ASPM not supported, Exit Latency L0s unlimited, L1 <16us ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+ LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk- ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkCap: Port #7, Speed 8GT/s, Width x1, ASPM not supported, Exit Latency L0s unlimited, L1 <16us ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+ LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk- ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1682711 Title: PCIe ASPM disabled even when enabled in FADT and pcie_aspm=force / setpci used To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682711/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs