From 56398ead607d8bcb9deef7ca3f4d7f78478f1b4c Mon Sep 17 00:00:00 2001 From: Olaf Meeuwissen Date: Sat, 22 Jul 2017 11:48:14 +0900 Subject: [PATCH] sane-usb: Document SANE_USB_WORKAROUND variable Fixes Alioth#315792. Thanks Zdenek Dohnal --- doc/sane-usb.man | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/doc/sane-usb.man b/doc/sane-usb.man index 5285b2f84..cb65c7f13 100644 --- a/doc/sane-usb.man +++ b/doc/sane-usb.man @@ -138,6 +138,13 @@ environment variable controls the debug level for the USB I/O subsystem. E.g., a value of 128 requests all debug output to be printed. Smaller levels reduce verbosity. Values greater than 4 enable libusb debugging (if available). Example: export SANE_DEBUG_SANEI_USB=4. +.PP +.TP +.B SANE_USB_WORKAROUND +If your scanner does not work when plugged into a USB3 port, try +setting the environment variable SANE_USB_WORKAROUND to 1. This +may work around issues which happen with particular kernel +versions. Example: export SANE_USB_WORKAROUND=1. .SH "SEE ALSO" .BR sane (7),