On 2021/04/22 22:52, xs wrote:
> - I've seen mentions of usb_quirks.c for usbhid driver in
>   /usr/local/share/doc/pkg-readmes/nut
> ```
> The option with fewest side-effects is to add the following entries to
> the table in /sys/dev/usb/usb_quirks.c and build a new kernel:
> 
> { USB_VENDOR_APC, USB_PRODUCT_APC_UPS, ANY, { UQ_BAD_HID }},
> { USB_VENDOR_APC, USB_PRODUCT_APC_UPS5G, ANY, { UQ_BAD_HID }},
> ```
> 
> - Would it be useful ?

No. That is for the case where a USB attaches to the uhid/upd drivers;
sometimes a device can still work with NUT when that happens, but often
not.

> - Is this related:
>   https://www.mail-archive.com/[email protected]/msg62221.html ?

Since it's attaching to ugen: no.

> - What should I try to get this USB communication reliable ?

Did it work any better with an older version?
Userland access to USB devices is definitely not perfect in OpenBSD.

btw, dmesg was missing from your mail.

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