Dell keyboard doesn't work at first startup

[papelhigienico]

At first startup, Dell Vostro 1510 keyboard doen't works. So, I reboot it from gdm, and at second startup it works.

I have tried put i8042.nopnp at the end of the line kernel options in grub and so I reconfigure it with "sudo dpkg-reconfigure grub" but without success.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
HibernationDevice: RESUME=UUID=768344b6-5ec2-4242-bb9a-0cf0a276c415
MachineType: Dell Inc. Vostro1510
NonfreeKernelModules: nvidia
Package: linux-image-2.6.28-11-generic 2.6.28-11.42
ProcCmdLine: root=UUID=a2033a8a-8a98-436f-b1c1-5630452a2493 ro locale=pt_BR quiet splash i8042.nopnp
ProcEnviron:
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-11.42-generic
SourcePackage: linux

[papelhigienico (papelhigienico)]

I do more tests...

The sequence of events:

1- I plugged my laptop in AC power source.
2- switched on and the ubuntu starts. The keyboard don't work.
3- So I reboot it and keyboard works.
4- Powered off it without remove the AC power of laptop.
5- switched on again and the ubuntu starts. The keyboard WORKS.
6- Powered off it again without remove the AC power of laptop.
7- switched on again and the ubuntu starts. The keyboard WORKS again.
8- Powered off it and remove the AC power of laptop. Wait some time...
9- switched on and the ubuntu starts again. The keyboard DON'T work.

Every time that I remove the AC power source of the laptop and starts it. I the same problem with slackware. With windows and FreeBSD keyboard works every time.

Attached is the dmesg when keyboard is not detected.

[papelhigienico (papelhigienico)]

in step 8, after wait some time, I plugged the AC power source on the laptop...

[papelhigienico (papelhigienico)]

See the bugs:
#334249
#341094