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Notebook HP Pavilion DV6750er Kubuntu 9.04 32bit (and 64bit)
$ uname -a
Linux pavilion 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux

WORKAROUND: Add to /etc/default/grub:
i8042.dumbkbd = 1
sudo update-grub
Reboot system

$ lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:01.0 PCI bridge: Intel Corporation Mobile PM965/GM965/GL960 PCI Express Root Port (rev 0c)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 03)
00:1c.5 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03)
01:00.0 VGA compatible controller: nVidia Corporation GeForce 8400M GS (rev a1)
02:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
08:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 01)
09:09.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
09:09.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
09:09.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 12)
09:09.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
09:09.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff)

$ cat /proc/bus/input/devices
I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input9
U: Uniq=
H: Handlers=mouse1 event9
B: EV=b
B: KEY=6420 0 70000 0 0 0 0 0 0 0 0
B: ABS=11000003

Touchpad work good, but when I switch keyboard layout from russian to english or english to russian(preference kde or gnome) it begins to twitch and:
$ dmesg
[184888.999466] synaptics was reset on resume, see synaptics_resume_reset if you have trouble on resume
[184898.680749] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[184898.682903] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[184898.685242] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[184898.686892] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[184898.701808] psmouse.c: TouchPad at isa0060/serio1/input0 - driver resynched.

$ tailf .xsession-errors
kxkb(3681) KxkbCore::x11EventFilter: got event: group changed to  1
kxkb(3681) X11Helper::getWindowClass: Got window class for  52428871 : ' "Qt-subapplication" '
kxkb(3681) LayoutMap::setCurrentLayout: map: Storing layout:  1  for  "winclass: Qt-subapplication"
kxkb(3681) KxkbWidget::setCurrentLayout: setting text:  "ru"
plasma(3640) WirelessInterfaceItem::setConnectionInfo: FIXME: tjkActive connections is empty while connected?
kxkb(3681) KxkbCore::x11EventFilter: got event: group changed to  0
kxkb(3681) X11Helper::getWindowClass: Got window class for  52428871 : ' "Qt-subapplication" '
kxkb(3681) LayoutMap::setCurrentLayout: map: Storing layout:  0  for  "winclass: Qt-subapplication"
kxkb(3681) KxkbWidget::setCurrentLayout: setting text:  "us"
plasma(3640) WirelessInterfaceItem::setConnectionInfo: FIXME: tjkActive connections is empty while connected?

$ sudo xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=12   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ HP Webcam                                 id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=11   [slave  keyboard (3)]
    ↳ HP WMI hotkeys                            id=13   [slave  keyboard (3)]

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: kubuntu
-- 
Synaptic touchpad lost sync when switch keyboard layouts
https://bugs.launchpad.net/bugs/366261
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