[Bug 1809847] [NEW] Ethernet[10ec:8136] doesn't work after S3 with kernel 4.15.0.43.64

Public bug reported:

[Impact]
The Ethernet works after S3 with kernel 4.15.0-33.36, and fails with kernel 4.15.0.43.64.
There is no interrupt while plug/unplug Ethernet cable after S3, so it looks like a regression after 4.15.0-33.36.

[Fix]
Check changelog and found there are 2 commits introduced from 4.15.0-35.38 might be suspicious
* r8169 no internet after suspending (LP: #1779817)
- r8169: don't use MSI-X on RTL8168g
- r8169: don't use MSI-X on RTL8106e
And check the upstream log and found the 2 MSI-X commits had been all reverted, since below commit claims it fixes the MSI-X interrupt issue which is already in Bionic kernel.
083874549fdf PCI: Reprogram bridge prefetch registers on resume
So, I reverted the 2 MSI-X commits and found the Ethernet works again after S3.

The upstream commits to revert the 2 MSI-X can't be clean cherry picked, so I revert the commits directly in Bionic kernel.
9675931e6b65 r8169: re-enable MSI-X on RTL8168g
d49c88d7677b r8169: Enable MSI-X on RTL8106e

[Regression Potential]
Low, the 2 disable MSI-X commits are workarounds, and now we have proper way to fix the issue, so it should be fine to revert them.

** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress

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https://bugs.launchpad.net/bugs/1809847

Title:
Ethernet[10ec:8136] doesn't work after S3 with kernel 4.15.0.43.64

Status in linux package in Ubuntu:
In Progress

Bug description:
[Impact]
The Ethernet works after S3 with kernel 4.15.0-33.36, and fails with kernel 4.15.0.43.64.
There is no interrupt while plug/unplug Ethernet cable after S3, so it looks like a regression after 4.15.0-33.36.

[Fix]
Check changelog and found there are 2 commits introduced from 4.15.0-35.38 might be suspicious
* r8169 no internet after suspending (LP: #1779817)
- r8169: don't use MSI-X on RTL8168g
- r8169: don't use MSI-X on RTL8106e
And check the upstream log and found the 2 MSI-X commits had been all reverted, since below commit claims it fixes the MSI-X interrupt issue which is already in Bionic kernel.
083874549fdf PCI: Reprogram bridge prefetch registers on resume
So, I reverted the 2 MSI-X commits and found the Ethernet works again after S3.

The upstream commits to revert the 2 MSI-X can't be clean cherry picked, so I revert the commits directly in Bionic kernel.
9675931e6b65 r8169: re-enable MSI-X on RTL8168g
d49c88d7677b r8169: Enable MSI-X on RTL8106e

[Regression Potential]
Low, the 2 disable MSI-X commits are workarounds, and now we have proper way to fix the issue, so it should be fine to revert them.

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