Thanks a lot to all for workaround.
Appending "i8042.reset i8042.nomux i8042.nopnp i8042.noloop" to the end of line "kernel /boot/vmlinuz-2.6.28-15-generic .............."(/boot/grub/menu.lst) works like a charm.
Thanks a lot to all for workaround.
Appending "i8042.reset i8042.nomux i8042.nopnp i8042.noloop" to the end of line "kernel /boot/vmlinuz- 2.6.28- 15-generic ....... ....... "(/boot/ grub/menu. lst) works like a charm.