[FS#4032] Uplink ethernet ports not connecting at gigabit speeds (Ath79)

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FS#4032 - Uplink ethernet ports not connecting at gigabit speeds (Ath79)
User who did this - Peter Sherman (psherman)

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Boris - can you try running 19.07.8 to see if your ethernet port runs properly at gigabit speeds?

It appears that your device was not supported on the ath79 platform until 21.02, but the ar71xx image is [[https://downloads.openwrt.org/releases/19.07.8/targets/ar71xx/generic/openwrt-19.07.8-ar71xx-generic-wzr-600dhp-squashfs-sysupgrade.bin|here]]. Do not retain settings (make a backup so you can restore quickly later). Test with a completely default installation to the greatest extent possible. Install ethtool and get info on the ethernet ports (similar to what I had done earlier). Then do the same thing with 21.02.

This won't necessarily answer what commit(s) broke the gigabit connectivity, but it will at least point to something in the ath79 target (as compared to something specific to your device or physical setup). My device was ath79 for both 19.07 and 21.02, and something clearly broke gigabit connectivity, but only on the uplink port.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4032#comment10182

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