netdev - 4.19-rc1: r8169 resume from suspend link negotiation issue

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Date:   Mon, 10 Sep 2018 05:21:28 +0100
From:   Neil MacLeod <neil@...cleod.com>
To:     netdev@...r.kernel.org
Subject: 4.19-rc1: r8169 resume from suspend link negotiation issue

Since 4.19-rc1 (up to and including 4.19-rc3) there is now a problem
with the r8169 network interface when resuming from suspend - the
negotiated network speed after resume is only 10Mbit/s half-duplex.

There is no problem with 4.18.y, and when booting into 4.19-rc3 from
power-on the full 1000Mbit/s full duplex link is correctly negotiated.

Bisecting the kernel commits between 4.18.6 and 4.19-rc1 identifies
the following commit as the bad commit:

"r8169: remove rtl8169_set_speed_xmii"[1]

Before suspend: dmesg[2], ethtool eth0[3] - 1000Mbit/s full duplex
After resume from suspend: dmesg[4], ethtool eth0[5] - 10Mbit/s half duplex

Anyone else seeing this?

Thanks
Neil

1. https://github.com/torvalds/linux/commit/a2965f12fde696d3754347bd48a7149b8de45b21
2. http://ix.io/1mn8
3. http://ix.io/1ltR
4. http://ix.io/1mn9
5. http://ix.io/1ltO