I did a little research to find the actual cause of the problem. There's actually two issues here:
1) powertop suggests to add the usbcore.autosuspend=1 kernel parameter, but we're shipping usbcore as a module (solution described here: https://bugs.launchpad.net/ubuntu/+source/powertop/+bug/136549/comments/16) this is a confirmed issue, and should be fixed 2) to decide whether to make this suggestion, powertop checks two things: a) that /sys/bus/usb/devices/*/power/autosuspend >=0 b) that /sys/bus/usb/devices/*/power/level != “on” I have found that in my machine the usb root hubs have power level = "auto", but slave devices (usb mouse, usb storage) have power lever = "on". this causes powertop to make this suggestion. I am not sure whether powertop is right on this one (i.e. whether the power levels should be auto) or whether the current situation is correct, and powertop should change... -- Powertop makes wrong suggestion to add usbcore.autosuspend=1 https://bugs.launchpad.net/bugs/136549 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
