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List:       gentoo-desktop
Subject:    [gentoo-desktop] Question : How to set per-device mouse sensitivity
From:       Mickael Chazaux <mickael.chazaux () gmail ! com>
Date:       2010-02-28 20:52:12
Message-ID: bc36f8ed1002281252n77248012m25fe6886b93b0b85 () mail ! gmail ! com
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Hi,

I have trouble setting the sensitivity of my mouse. Let me explain
what I try to achieve. I have two pointing devices, a touchpad and a
Bluetooth mouse. One is usable, the other is way too fast for me to be
usable. xf86-input-mouse has an interesting option, named
'Sensitivity' which basically multiplies the movement of the device by
a provided float. What I want to be able to do is to set the
sensitivity of my devices separately. (eg 1.0 for the touchpad, and
0.3 for the Bluetooth mouse). 'xset m' does not provide this
sensitivity parameter, and acceleration is already at 1.
To do that, I tried two methods : writing a xorg.conf, and using HAL rules.

Using xorg.conf to hardcode values for /dev/input/mouse1 and
/dev/input/mouse2 seemed to be a good approach at first, but in order
to make Xorg use the Sections, one has to enable AllowEmptyInput and
thus AutoAddDevices (from man xorg.conf)

AutoAddDevices is what makes HAL automatically adds devices (USB mice,
etc...) and I don't want to disable that.

So I tried to put this in /etc/hal/fdi/policy/bt-mouse-speed.fdi :

<?xml version="1.0" encoding="ISO-8859-1"?>
<deviceinfo version="0.2">
  <device>
        <match key="info.product" string="Bluetooth Laser Travel Mouse">
               <merge key="input.x11_options.Sensitivity"
type="string">0.1</merge>
        </match>
    </match>
  </device>
</deviceinfo>

lshal says that about my mouse :

udi = '/org/freedesktop/Hal/devices/bluetooth_acl_761ea325e_logicaldev_input'
  info.capabilities = {'input', 'input.mouse'} (string list)
  info.category = 'input'  (string)
  info.parent = '/org/freedesktop/Hal/devices/bluetooth_acl_761ea325e'  (string)
  info.product = 'Bluetooth Laser Travel Mouse'  (string)
  info.subsystem = 'input'  (string)
  info.udi = '/org/freedesktop/Hal/devices/bluetooth_acl_761ea325e_logicaldev_input'
 (string)
  input.device = '/dev/input/event12'  (string)
  input.originating_device =
'/org/freedesktop/Hal/devices/bluetooth_acl_761ea325e'  (string)
  input.product = 'Bluetooth Laser Travel Mouse'  (string)
  input.x11_driver = 'evdev'  (string)
  linux.device_file = '/dev/input/event12'  (string)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'input'  (string)
  linux.sysfs_path =
'/sys/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.0/bluetooth/hci0/hci0:11/input16/event12'
 (string)


I don't have a big experience in writing hal rules, and I can't figure
out why they don't work as expected. That's why I ask this question
here :
How can I set the mouse sensitivity on a per-device basis?

Thanks for your attention,

Mickael

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