When enabling usb autosuspend, new usb devices aren't recognized

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Hi,

To enable usb autosuspend i use the following in a script after booting:
for i in `find /sys/bus/usb/devices/*/power/control`; do echo auto > $i; done;
for i in `find /sys/bus/usb/devices/*/power/autosuspend`; do echo 2 > $i; done;

After this new usb devices aren't recognized anymore. Whether 'lsusb' nor
'dmesg' show up anything.
When i turn the usb port back on manualy: (echo on >
/sys/bus/usb/devices/3-1/power/control) the usb device shows up.

Since this is my first bug report I'll just add what I think is helpful.

% lspci | grep -i usb
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB xHCI Host Controller (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB Enhanced Host Controller #2 (rev 04)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB Enhanced Host Controller #1 (rev 04)

My system is a Lenovo Thinkpad x230.

I'm using arch linux with linux-mainline kernel
(https://aur.archlinux.org/packages.php?ID=50893)
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