Hi Minas,

On Thu, Jul 1, 2021 at 1:09 AM Martin Blumenstingl
[off-list ref] wrote:

Hi Minas,

On Tue, Jun 29, 2021 at 6:30 PM Martin Blumenstingl
[off-list ref] wrote:

quoted

Hi Alan,

On Tue, Jun 29, 2021 at 6:18 PM Alan Stern [off-list ref] wrote:
[...]

quoted

quoted

quoted

        usbcore.autosuspend=-1

wow, this helps indeed
my steps are:
- power off my Odroid-C1+
- unplug all USB devices
- boot with usbcore.autosuspend=-1 in the kernel cmdline
- plugin my Corsair Voyager USB 3.0 flash drive (which was only
detected before if an additional USB 2.0 flash drive was plugged in
during boot)
-> without any lsusb magic the device was immediately recognized

That does show pretty convincingly that runtime suspend is causing the
problem.  But I still have no idea why the problem affects some devices
and not others.  It's a mystery.

Maybe because there's two related problems (I am guessing here):
The first issue is that USB hotplug is not working at all on my
Odroid-C1+ (which means: dwc2 + GL852G USB hub).
The second issue is that the workaround we had before (running lsusb
-vv to make "hot plugged" devices show up) is not working for some USB
devices.

It seems that using a different workaround (usbcore.autosuspend=-1)
makes *all* USB devices show up - even without any "lsusb -vv" call.
So I think we should focus on the first issue as it may also fix the
other problem as well.

above paragraph sums up the issues which Matt and I are seeing (on
Odroid-C1+ and Odroid-C2) in case you didn't follow the full email
thread

It's been a week since I sent my last mail
In case you are taking some days off: enjoy that time!
Please let us know if you have any questions about this as we're
looking forward to some hints on how to debug (and of course fix!)
this.


Best regards,
Martin