This is a known problem and widely reported. Confirming.
** Changed in: sane-backends (Ubuntu)
Importance: Low => Medium
** Changed in: sane-backends (Ubuntu)
Status: Incomplete => Triaged
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https://bugs.launchpad.net/bugs/1395271
Title:
USB 1 and USB 2 scanners fail when connected to USB 3 ports
Status in sane-backends package in Ubuntu:
Triaged
Bug description:
Plugging a number of USB 1 and USB 2 scanners into the USB 2 port of
various computers works as expected. Moving the scanners to the USB 3
port of the same computers causes the scanners to stop working. The
scanners are recognized by sane-find-scanner, but fail to scan. The
difference appears to be the USB 2 ports using ehci-pci and the USB 3
ports using xhci_hcd.
The problem is becoming more serious as new computers come out with
only USB 3 ports and no option to disable xhci_hcd in the bios.
Is there a workaround or fix for this problem?
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