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[Vyacheslav <slavoon2@xxxxxxxxx>]

thank you all for help! as I already understood - in this topic users reports about DIFFERENT bugs (but the same sympthoms) - if you are lazy to read this topic above:
1) if your dmesg log contains USB errors ('reset low speed USB device' or other) - try to physically unplug USB devices (mayby onboard keyboards in notebooks seen as like USB devices in some situations?) or re-plug to ANOTHER USB controller; try to use USB keyboard (another keyboard); try to disable legacy USB support in BIOS. This is kernel problem.
2) if your dmesg log contains non-USB errors ('Unknown key released' or something else) - 
try to change the BIOS setting 'Plug and play OS' to it's default state ('No');
try to disable WiFi adapter;
try to disable OpenGl in KDE, Gnome, ...   ;
try to set atkbd.softrepeat=1 parameter to the kernel boot parameters in Grub;
try to unload the battery, AC and thermal modules of kernel after booting;
try to set acpi=off parameter to the kernel boot parameters in Grub;
try to disable legacy USB support in BIOS;
try to execute xset r rate 1000 50 command;
try to set in BIOS do not check if PCI-express videocard not installed search for PCI video card, if not - try to initialize internal video card - instead of it set BIOS to initialize your existing video card first;
try to disable auto-repeat keys in keyboard in KDE or Gnome settings;
try to switch to another kernel;
try to execute xmodmap /usr/share/xmodmap/xmodmap.us-101 each time the bug occurs;
try to set highres=off nohz=off noapm parameters to the kernel boot parameters in Grub;
try to remove gnome-sensors-applet , lm_sensors , net-snmp-libs , hplip , hpijs , net-snmp packages or packages with same functionality;
try to edit /etc/mkinitcpio.conf and remove the word 'keyboard' from line HOOKS="... ;
try to remove gnome-accessibility-themes , gnome-accessibility-themes-extras accessibility packages or packages with same functionality;
try to remove hotkeys-setup package or package with same functionality;
try to report at bugs.launchpad.net and ubuntuforums.org about this bug (include your list of hardware (lspci command) and Linux version (uname -a command) and dmesg log)
This is a kernel problem also.
useful links (are already listed above in this thread):
http://bugzilla.kernel.org/show_bug.cgi?id=9147
http://bugzilla.kernel.org/show_bug.cgi?id=9448
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/39315
http://bugzilla.kernel.org/show_bug.cgi?id=12021

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https://bugs.launchpad.net/bugs/124406

Title:
  Keyboard keys get stuck and repeat

Status in GNU Emacs:
  Invalid
Status in The Linux Kernel:
  Confirmed
Status in X.Org X server:
  In Progress
Status in “linux” package in Ubuntu:
  Won't Fix
Status in “xorg-server” package in Ubuntu:
  Won't Fix
Status in “linux” source package in Jaunty:
  Won't Fix
Status in “xorg-server” source package in Jaunty:
  Invalid
Status in Gentoo Linux:
  New

Bug description:
  Keyboard keys such as the arrows, Alt-F4, PageUp/PageDown, etc. often
  get 'stuck' and continue being 'clicked' even after they are
  physically released. For example when clicking Alt-F4, sometimes it
  gets stuck so all the windows are closed instead of just one.

  My configuration is Feisty + Xgl + Compiz Fusion. My previous
  configuration was Edgy + Xgl + Beryl, where this didn't happen. Others
  have reported the same problem without using either Xgl or Compiz.

  The keyboard itself isn't the problem. When dual-booting to Windows,
  everything works fine. Also, the problem happens with two different
  keyboards (internal laptop, external USB).

  My best guess is that the problem occurs at time of high system load.
  Somehow during these times the key-release signal gets lost and the
  key-press is repeated indefinitely. This happens more often with
  Compiz configurations because Compiz tends to increase system load. It
  also happens more often with power-hungry apps like Firefox and
  Acrobat Reader for similar reasons.

  PS: When the keys would repeat all input devices would be locked up.
  ie. mouse won't move, clicks don't do anything, keyboard presses don't
  register. Then when it becomes unstuck, the mouse moves around and
  everything. Hope this helps.

  See also this forum thread for other people with the same problem:
  http://ubuntuforums.org/showthread.php?t=432057

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