Re: XHCI, "brain-dead scanner", and microframe rounding

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On Sun, 15 Nov 2015, Stéphane Lavergne wrote:

> On Sat, Sep 12, 2015 at 4:08 AM, Hans-Peter Jansen <hpj@xxxxxxxxx> wrote:
> > With some changes in the 4.0 time frame, AND an update of the epson iscan
> > stuff, I'm happily scanning with my Epson 4490 Photo scanner plugged to a USB
> > 3.0 port using xsane.
> >
> > Other USB 3.0 issues are currently investigated.
> 
> Thank you for the update.  I updated my Debian amd64 box to kernel
> 4.2.0-0 (Jessie backport) today, re-enabled "Auto" XHCI in my Gigabyte
> BIOS and I can confirm that xhci_usb is handling my Fujitsu ScanSnap
> S1500 correctly now.
> 
> FYI I do get 2 warnings in dmesg and my console every single time Sane
> talks to the device:
> 
> [ 2036.780271] usb 3-12: ep 0x81 - rounding interval to 128
> microframes, ep desc says 255 microframes
> 
> [ 2036.780835] usb 3-12: ep 0x2 - rounding interval to 128
> microframes, ep desc says 255 microframes
> 
> No big deal, just thought I'd let _someone_ out there know. :)

There's no reason for these messages to be warnings.  They don't
indicate that anything is wrong or out of the ordinary.  Probably they
should be debug-level.

Alan Stern

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