[Vivid][SRU][PATCH] LP#1489292 System cannot detect USB device in BAT mode

Phidias Chiang phidias.chiang at canonical.com
Tue Sep 1 10:01:31 UTC 2015


BugLink: http://bugs.launchpad.net/bugs/1489292

[Impact]

On some Skylake-U platforms, if boots with battery only and has no USB
device connect, after boot the USB port can't be used, even though the
xHCI Host Controller doesn't report any error in dmesg. The USB device
looks like doesn't turn on, LED on USB mouse or keyboard doesn't light up.

[Fix]

There's a fix in mainline v4.2-rc3, though it states the fix is for Braswell,
but the uuid use in the commit can also be found on Skylake-U platforms.

[Test]

1. Install the patched kernel
2. Boot with battery
3. Insert a USB device (disk, keyboard, mouse), should work normally

Mathias Nyman (1):
  xhci: call BIOS workaround to enable runtime suspend on Intel Braswell

 drivers/usb/host/xhci-pci.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

-- 
2.1.4





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