Comment 17 for bug 1939638

Hello Dries and Tilman,

Thank you for providing the logs and other relevant information. For clarification, when you were testing if the issue still exists, was this from cold boot or warm boot?

And if you sometimes see it working from cold boot it indeed seems to be very racey. There now should be a 100ms power-on-to-good delay on all usb 3.0 hubs since 5.4.0-97, which seems like it used to delay whatever race seems to be going on when the roothubs are being registered (as per the discussion here https://bugzilla.kernel.org/show_bug.cgi?id=214021), but maybe that isn't enough to avoid the race in your case?
p.s. If you run lsusb -v as root you should be able to see the bPwrOn2PwrGood value of the root hubs as 100ms.

Also, the patchset that seemed to directly address this issue got reverted due to regressions and never seemed to be re-addressed upstream... there seem to be a lot of fixes for those introduced problems since then though so maybe it would make sense to reintroduce those patches.

I will send an email to the upstream usb mailing list asking about this and see what their thoughts are.

Thanks,
- Luke