PCIE speed

sudo lspci -vv | grep -E 'PCI bridge|LnkCap|LnkSta:' 

00:1b.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #21 (rev f0) (prog-if 00 [Normal decode])
        LnkCap:    Port #21, Speed 8GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <1us, L1 <16us
        LnkSta:    Speed 8GT/s (ok), Width x4 (ok)
00:1c.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #8 (rev f0) (prog-if 00 [Normal decode])
        LnkCap:    Port #8, Speed 8GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <1us, L1 <16us
        LnkSta:    Speed 5GT/s (downgraded), Width x1 (ok)
        LnkCap:    Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L1 <8us
        LnkSta:    Speed 8GT/s (ok), Width x4 (ok)
        LnkCap:    Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <4us, L1 unlimited
        LnkSta:    Speed 5GT/s (ok), Width x1 (ok)