From 4e54f5334e130dc8f627c96ef2179ff4262b7791 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 25 Jan 2011 15:51:07 +0100 Subject: extras: add rules for qemu guests These patches enable usb autosuspend for the qemu emulated HID devices. This reduces the cpu load for idle guests with a hid device attached because the linux kernel will suspend the usb bus then and qemu can stop running a 1000 Hz to emulate the (active) UHCI controller. Signed-off-by: Gerd Hoffmann --- extras/qemu/42-qemu-usb.rules | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 extras/qemu/42-qemu-usb.rules (limited to 'extras/qemu/42-qemu-usb.rules') diff --git a/extras/qemu/42-qemu-usb.rules b/extras/qemu/42-qemu-usb.rules new file mode 100644 index 0000000000..4fd53c7477 --- /dev/null +++ b/extras/qemu/42-qemu-usb.rules @@ -0,0 +1,13 @@ +# +# Enable autosuspend for qemu emulated usb hid devices. +# +# Note that there are buggy qemu versions which advertise remote +# wakeup support but don't actually implement it correctly. This +# is the reason why we need a match for the serial number here. +# The serial number "42" is used to tag the implementations where +# remote wakeup is working. +# + +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Mouse", ATTR{serial}=="42", TEST=="power/control", ATTR{power/control}="auto" +ACTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Tablet", ATTR{serial}=="42", TEST=="power/control", ATTR{power/control}="auto" +CTION=="add", SUBSYSTEM=="usb", ATTR{product}=="QEMU USB Keyboard", ATTR{serial}=="42", TEST=="power/control", ATTR{power/control}="auto" -- cgit v1.2.3-54-g00ecf