Bug 410755 – sys-fs/udev-182-r2: touchpad stopped working in X after upgrade

• Product: Gentoo Linux
• Status: RESOLVED WORKSFORME

[Description Andrey Grozin 2012-04-04 09:11:20 UTC]

On my eeePC-1005PE, there is a touchpad and a usb mouse. After upgrade to udev-182-r2 the touchpad no longer works in X (the mouse works). More exactly, touchpad buttons work, but I cannot move the mouse pointer with the touchpad. The relevant part of Xorg.0.log is

[    43.992] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad (/dev/input/event7)
[    43.992] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "evdev touchpad catchall"
[    43.992] (II) Using input driver 'evdev' for 'SynPS/2 Synaptics TouchPad'
[    43.992] (**) SynPS/2 Synaptics TouchPad: always reports core events
[    43.992] (**) evdev: SynPS/2 Synaptics TouchPad: Device: "/dev/input/event7"
[    43.992] (--) evdev: SynPS/2 Synaptics TouchPad: Vendor 0x2 Product 0x7
[    43.992] (--) evdev: SynPS/2 Synaptics TouchPad: Found 3 mouse buttons
[    43.992] (--) evdev: SynPS/2 Synaptics TouchPad: Found absolute axes
[    43.992] (--) evdev: SynPS/2 Synaptics TouchPad: Found absolute multitouch axes
[    43.992] (--) evdev: SynPS/2 Synaptics TouchPad: Found x and y absolute axes
[    43.992] (--) evdev: SynPS/2 Synaptics TouchPad: Found absolute touchpad.
[    43.992] (II) evdev: SynPS/2 Synaptics TouchPad: Configuring as touchpad
[    43.992] (**) evdev: SynPS/2 Synaptics TouchPad: YAxisMapping: buttons 4 and 5
[    43.992] (**) evdev: SynPS/2 Synaptics TouchPad: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[    43.992] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio1/input/input7/event7"
[    43.992] (II) XINPUT: Adding extended input device "SynPS/2 Synaptics TouchPad" (type: TOUCHPAD, id 13)
[    43.993] (II) evdev: SynPS/2 Synaptics TouchPad: initialized for absolute axes.
[    43.993] (**) SynPS/2 Synaptics TouchPad: (accel) keeping acceleration scheme 1
[    43.993] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration profile 0
[    43.993] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration factor: 2.000
[    43.993] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration threshold: 4
[    43.994] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad (/dev/input/mouse0)
[    43.994] (II) No input driver specified, ignoring this device.
[    43.994] (II) This device may have been added with another device file.

xorg-server-1.12.0-r1, xf86-input-evdev-2.7.0, xf86-video-intel-2.18.0, kernel 3.3.0 (gentoo-sources).

Both the touchpad and the mouse still work OK in the text mode, /etc/conf.d/gpm specifies

MOUSEDEV=/dev/input/mice

Another observation: I see neither touchpad nor mouse in

eeepc ~ # lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 13d3:5126 IMC Networks 
Bus 002 Device 002: ID 04f3:0232 Elan Microelectronics Corp. 
Bus 005 Device 002: ID 0b05:1788 ASUSTek Computer, Inc. 

Webcam is also absent here (though it works, at least in skype); lshw does not show them, too.

[Comment 1 Chí-Thanh Christopher Nguyễn 2012-04-04 09:57:47 UTC]

Please attach /proc/bus/input/devices and output of "xinput list --long"
Do you see the same problem if you use xf86-input-synaptics instead of xf86-input-evdev?

[Comment 2 Andrey Grozin 2012-04-04 14:16:12 UTC]

Created attachment 307771 [details]
/proc/bus/input/devices

[Comment 3 Andrey Grozin 2012-04-04 14:17:24 UTC]

Created attachment 307773 [details]
xinput list --long

[Comment 4 Chí-Thanh Christopher Nguyễn 2012-04-04 14:28:00 UTC]

> ⎜   ↳ SynPS/2 Synaptics TouchPad              	id=13	[slave  pointer  (2)]
appears to be detected correctly, including X and Y valuators.

As you might have an Elantech touchpad (verify by running update-usbids, then lsusb again), is MOUSE_PS2_ELANTECH enabled in your kernel?

[Comment 5 Andrey Grozin 2012-04-04 16:13:08 UTC]

Thanks. I've done the following:

1. recompiled the kernel with Elantech PS/2 protocol extension enabled
2. emerged x11-drivers/xf86-input-synaptics-1.5.2
3. Added an InputDevice section with Driver "synaptic" to xorg.conf, and mentioned this section in ServerLayout

Now both the touchpad and the mouse work. The only thing I cannot understand: why they worked fine without all these things before the upgrade to the latest udev?