Comment 3 for bug 1870410

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Dave Jones (waveform) wrote : Re: wireless does not work on boot

Also tested under armhf and arm64 on Raspberry Pi models 3B, 3A+, and 3B+. Results are the same as for bdmurray's tests with armhf on the 3B above.

My initial suspicion was that this was related to the wifi chipset used on the 3B (the BCM43430) to the 4B (the BCM43455). However, given the 3A+ and 3B+ also use the BCM43455 (same as the 4B) it's definitely not that.

Given that the only error ("DHCP4 CLIENT: Failed to attach event...") occurred in systemd-networkd I attempted to downgrade from version 245.2 to 244.3 (the prior release on Ubuntu). This fixes the issue on the 3B and 3A+ under armhf and arm64 (I skipped checking the 3B+ for time at this point).

At this point I'm reasonably confident it's an issue in systemd introduced sometime between 244.3 and 245.2 - and that it may be timing sensitive given that the 4B (which is significantly faster than the 3, 3A+ or 3B+) doesn't show the same symptoms but shares a wifi chipset with the 3A+ and 3B+.