Comment 110 for bug 1803179

While investigating, I found an anomaly in the form of an Alienware 13 R2. This device also fails to properly initialize the nvidia device after resume. The gpu is connected to a pci bridge
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #1 (rev f1) (prog-if 00 [Normal decode])

This was limited by the manufacturer to gen2 (5GT/s) speed:
LnkCap: Port #1, Speed 5GT/s, Width x4, ASPM not supported

Thus, this device can never reach 8GT/s so the patch doesn't have any effect.
The only noticeable difference on the gpu is:
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
after boot:
LnkCap: Port #0, Speed 5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <512ns, L1 <4us
after resume:
LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <512ns, L1 <4us
The bridge stays the same, though, at LinkCap 5GT/s

Yet, the acpi still contains
While (LNKS < 0x07)
    {