[FS#3099] ipq806x: kernel 5.4 crash related to CPU frequency scaling

[OpenWrt Bugs]

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FS#3099 - ipq806x: kernel 5.4 crash related to CPU frequency scaling
User who did this - Shane (digitalcircuit)

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====☑ Snapshot succeeds where 21.02.0-rc1 fails====

I'm testing a very recent snapshot for the ZyXEL NBG6817 ("Tue May 18 22:05:39 2021"), and the first full Deja Dup desktop system backup succeeded with the default ("ondemand") CPU governor!  The end result is about 224 GB of data transferred via WiFi to a USB 3.0 external HDD over a period of roughly a fourth a day.

Granted, it's possible other changes between 21.02.0rc1 and the snapshot fixed this issue, and it's possible the issue still exists and I just haven't triggered it yet, but given the similarities to this bug report, I'm inclined to believe it's the CPU governor changes.

I will continue testing by redoing full Deja Dup backups to the router's OpenSSH SFTP chroot and I'll edit my comment to log further test results.

====Current test results: 1/1 full backups succeeded====
Last updated: Wed 19 May 2021 02:08:00 AM EDT
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3099#comment9681

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