[Nut-upsuser] USBDEVFS_CONTROL failed cmd usbhid-ups

Arjen de Korte nut+users at de-korte.org
Wed Nov 25 13:12:58 UTC 2009

Citeren Arnaud Quette <aquette.dev op gmail.com>:

> for the system load, I still have to do a powertop pass and some more
> tuning to improve the driver.

We might also want to spread out the full polls, so that they are not  
sent one after the other. So instead of doing either a quick or full  
poll, it might be better to grab a few variables with each quick poll  
in a round robin fashion. This would reduce the peak load on the UPS.

> but Arjen has (will) also started to work on the libusb 1.0 support,
> which should improve the things a bit.

Well, that depends. Looking at the reply Charles gave me on adding  
dynamically adding file descriptors to poll:


it may take some time before libusb-1.0 is common on the platforms we  
support. Since making use of the asynchronous I/O requires essentially  
rebuilding the whole driver, this may be too soon.

Best regards, Arjen
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