Hi, This a follow-up from a discussion from “[PATCH V2] PCI/ASPM: Save/restore L1SS Capability for suspend/resume” (https://lore.kernel.org/lkml/d3228b1f-8d12-bfab-4cba-6d93a6869f20@xxxxxxxxxx/t/) While working with Vidya’s patch I have noticed that after suspend/resume cycle on my Chromebook (Apollolake) PCIe bridge loses its capabilities - the missing part is: Capabilities: [200 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=40us PortTPowerOnTime=10us L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ T_CommonMode=40us LTR1.2_Threshold=98304ns L1SubCtl2: T_PwrOn=60us Digging more I’ve found out that entering D3Cold state causes this issue (D3Hot seems to work fine). With Vidya’s patch (all versions form V1 to V3) on upstream kernels 5.10/5.15 it was causing underlying device unavailable (in my case - WiFi card) - the V4 (which was accepted and merged) works fine (I guess thanks to “PCI/ASPM: Refactor L1 PM Substates Control Register programming”) but the issue is still there - I mean now after suspend/resume the underlying deceive works fine but mentioned capabilities are still gone when using lspci -vvv. I think with current code it does no harm to anyone, but just doing a heads up about this. Best regards, Lukasz