On Montag, 25. Juni 2007, Jeff Kowalczyk wrote: > Jeff Kowalczyk wrote: > > My everyday flatbed scanner ((vendor=0x04a9 [Canon], product=0x220d > > [CanoScan], chip=LM9832/3) at libusb:002:002) got out of sorts today. > > The scan head wasn't returned to the home position (it is now), but > > XSane scans now just return solid black data. > > I see that it's a known problem, since I have (recently) enabled > CONFIG_USB_SUSPEND to try powertop, and this is using the plustek backend. > In fact it's not only a Plustek problem - it's a problem of all ASICs, that support someting like a suspend mode. The LM983x enters that mode, when there is no activity on the USB-bus for 3ms. Most of the registers will be reset during that...
I will try and focus on that during the next days... Cheers Gerhard
