Hi Hans, > On many laptops the btusb device is the only USB device not having USB > autosuspend enabled, this causes not only the HCI but also the USB > controller to stay awake, together using aprox. 0.4W of power. > > Modern ultrabooks idle around 6W (at 50% screen brightness), 3.5W for > Apollo Lake devices. 0.4W is a significant chunk of this (7 / 11%). > > The btusb driver already contains code to allow enabling USB autosuspend, > but currently leaves it up to the user / userspace to enable it. This > means that for most people it will not be enabled, leading to an > unnecessarily high power consumption. > > Since enabling it is not entirely without risk of regressions, this > commit adds a Kconfig option so that Linux distributions can choose to > enable it by default. This commit also adds a module option so that when > distros receive bugs they can easily ask the user to disable it again > for easy debugging. > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> > --- > Changes in v2: > -s/BT_USB_AUTOSUSPEND/BT_HCIBTUSB_AUTOSUSPEND/ > -s/enable_usb_autosuspend/enable_autosuspend/ > --- > drivers/bluetooth/Kconfig | 10 ++++++++++ > drivers/bluetooth/btusb.c | 7 +++++++ > 2 files changed, 17 insertions(+) patch has been applied to bluetooth-next tree. Regards Marcel -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
