Hi , I need to test a functionality with USB autosuspend with latest kernel Linux 4.18-rc8. I am trying to autosuspend a USB key board, i enabled its autosuspend by doing echo "auto" to its "control" attributes. I am expecting USB keyboard to go to autosuspend after autosuspend_delay_ms. But USB key board is not going to autosuspend because its runtime usage count is not equal to zero. Below are the log snippets: root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/runtime_enabled enabled root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/control auto root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/autosuspend_delay_ms 2000 root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/runtime_status active root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/runtime_usage 1 root@intel-Kabylake-Client-platform:# sleep 60; cat /sys/bus/usb/devices/1-5/power/runtime_usage 1 My USB keyboard runtime usage reference count is not decreasing to zero. Here am i missing something regarding runtime usage count or is it some issue with my kernel or OS? Thanks, Anshuman Gupta.
