tree bdf2114cf04cf8c214896b0af91cd8d4c87217d4
parent 1b259904a2d0ad8c57feb498932bed5171112af3
author Hans de Goede <hdegoede@redhat.com> 1510580656 +0100
committer Marcel Holtmann <marcel@holtmann.org> 1513121320 +0100

Bluetooth: btusb: Add a Kconfig option to enable USB autosuspend by default

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@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>