On Fri, 8 Sep 2017, Jiri Kosina wrote: > On Fri, 8 Sep 2017, Mike Simms wrote: > > > Thanks for getting back to me, > > > > 4.11.11-300.fc26.x86_64 and 4.12.9-300.fc26.x86_64 > > are showing identical settings - autosuspend definitely on for > > device /sys/bus/usb/devices/2-1.3/2-1.3:1.0/0003:046D:C52B.0001/power > > > > it shows in the powertop UI as good for both kernels and > > > > Folder contents are autosuspend_delay_ms (can't open), control (auto), > > runtime_active_time (0), runtime_status (unsupported), The "unsupported" means that runtime suspend is disabled. (Don't ask me why it doesn't say "disabled" instead.) That is suspicious in itself. Drivers don't normally disable runtime suspend for more than very short time intervals. Does the runtime_status file really say "unsupported" in both kernels? > > runtime_suspended_time (0) > > Alright, that means that both kernels are allowed to autosuspend the > device, but apparently only 4.12 actually does so. Could you please > confirm that with usbmon traces? In addition to usbmon traces, it would be good to look at the settings under /sys/bus/usb/devices/2-1.3/2-1.3:1.0/power/. It's unlikely that they have changed between 4.11 and 4.12, but it doesn't hurt to check. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
