Hi Mathias, FYI, turned out to be pretty easy. I got the tip from deano_ferrari without even asking: https://forums.opensuse.org/showthread.php/519926-No-USB-device-detected? p=2794434#post2794434 Simply adding this to GRUB options while launching kernel: usbcore.autosuspend=-1 disables USB suspends and fixes the problem (well, "workarounds" it). Weirdly enough, I still get "auto" on battery with: cat /sys/bus/pci/devices/0000\:00\:14.0/power/control Though I get "-1" from this: cat /sys/module/usbcore/parameters/autosuspend Not sure any of this is relevant, but I guess sharing information can't hurt. Cheers, Pierre. Le vendredi 30 septembre 2016, 11:32:46 NZDT Mathias Nyman a écrit : > On 29.09.2016 23:36, Pierre de Villemereuil wrote: > > Hi Mathias, > > > > It seems you are right: entering > > echo on > /sys/bus/pci/devices/0000\:00\:14.0/power/control > > does tame USB to behave properly. > > > > However, every time the AC is plugged/unplugged, this value gets > > overridden. Any way to make this permanent? (I realise this would harm a > > tiny bit of my battery life, but I guess not enough for me to realise > > it). > There's probably something like laptop-mode-tools that sets these, I'm not > really familiar, or using it myself but I'd start looking in > > /etc/laptop-mode/laptop-mode.conf > /etc/laptop-mode/conf.d/* > > and try to find the configuration that enables runtime power management for > usb host while on battery. > > -Mathias -- 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
