xhci

root@pluto /home/niklas # clear
root@pluto /home/niklas # lsmod | grep xhci
xhci_hcd              144489  0
usbcore               180909  6 btusb,uvcvideo,ehci_hcd,ehci_pci,usbip_host,xhci_hcd
root@pluto /home/niklas # lspci -nv | grep -C 6 xhci
00:14.0 0c03: 8086:8c31 (rev 05) (prog-if 30 [XHCI])
        Subsystem: 1558:7410
        Flags: bus master, medium devsel, latency 0, IRQ 43
        Memory at f7e20000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: [70] Power Management version 2
        Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
        Kernel driver in use: xhci_hcd
        Kernel modules: xhci_hcd

00:16.0 0780: 8086:8c3a (rev 04)
        Subsystem: 1558:7410
        Flags: bus master, fast devsel, latency 0, IRQ 45
        Memory at f7e3f000 (64-bit, non-prefetchable) [size=16]
        Capabilities: [50] Power Management version 3
root@pluto /home/niklas # setpci -s 00:14.0 CAP_PM+4.b
08
root@pluto /home/niklas # modprobe -r xhci_hcd
root@pluto /home/niklas # setpci -s 00:14.0 CAP_PM+4.b
0b
root@pluto /home/niklas # setpci -s 00:14.0 CAP_PM+4.b=08
root@pluto /home/niklas # setpci -s 00:14.0 CAP_PM+4.b
08
root@pluto /home/niklas # systemctl poweroff