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One T420S tweak out of the box on XUbuntu

Was having some weird issue where my USB mouse and USB keyboard were timing out / acting weird / stopping intermittently

`dmesg` showed

[ 1011.238846] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D3
[ 1013.296188] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D0
[ 1013.309146] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D0
[ 1013.309280] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D0
[ 1013.309293] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D0

which bought me to.. https://bbs.archlinux.org/viewtopic.php?id=133753

So it seems the USB was going into suspend mode too early / uncontrollably, so I edited /etc/laptop-mode/conf.d/usb-autosuspend.conf and set CONTROL_USB_AUTOSUSPEND="1" and AUTOSUSPEND_TIMEOUT=120

otherwise, really happy with Linux on my Lenovo T420S!

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