On 06/26/2014 06:36 PM, Thomas Taylor wrote:
On Thu, 26 Jun 2014 15:46:31 +0200 Zeitlinie <zeitlinie@yahoo.de> wrote:
Hi
on my laptop all USB ports remain in a 'power-on' state after having suspended the machine.
The laptop's (a Lenovo T440s, with openSUSE 13.1 (x86_64), kernel 3.11.10-11-desktop) BIOS offers a disable/enable switch to allow for a 'power-on' state of USB in low-power and suspend states. For me this switch has no effect. Both, with this switch enabled or disabled, all USB port remain in a 'power-on' state when the lid is closed.
(As far as I can see, other hardware of the system does get suspended when I close the laptop's lid)
Any idea why this happens and any help to have USB also suspended when suspending the laptop would be most appreciated.
wbwb
This is basically so people can use it for recharging cell phones and cameras or other battery powered USB devices. If that causes a problem with some device plugged into the USB port while the laptop is in a suspended state then unplug the device. This does not use excess battery power as the power supply is always in use if the power cord is plugged in.
Actually it does not depend on if the cord is plugged in or not: power supply through USB remains 'on' even if I pull the power cord. To me this does not seem proper functioning. In particular since the BIOS does directly say so: namely, that when USB always-power-on is 'disabled' in BIOS there should not be any power on the USB ports in the suspend state.
That is to supply power for the "on-off or power button or lid closure switch.
Tom
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