[Bug 1082654] [NEW] Boot menu completely broken if external usb keyboard used (touch it and you won't be able to boot)

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I have a laptop, and I often use it with an external USB keyboard and an
external screen connected.

Recently II observe the following issue (maybe it's been there before,
but I usually didn't need to change the boot selection so I never
triggered it):

-- REPRODUCES THE ISSUE --
- turn on the laptop with the USB keyboard already connected
- touch the up or down arrow key on the external keyboard to pick a boot option

=> the system goes berserk and stops responding correctly to both the
external and builtin keyboard. It looks like some key got stuck,
permanently pressed. The cursor will move all the way down or all the
way up but you can't choose an item. Also, I hear noise from the
speakers (like pulses). Disconnecting the USB keyboard won't fix the
issue. I have to switch off the computer


-- DOESN'T REPRODUCE THE ISSUE --
- turn on the laptop with or without the USB keyboard connected (it's ok to have it connected as far as you don't touch it)
- never touch the external keyboard
- use the built in keyboard to navigate in the boot menu.

=> boot menu works fine and I can boot.


If this was a hardware issue, it would show up even after boot. Instead, once I have booted correctly, I can use the external keyboard without any issue.

So it must be some software issue in the linux loader or something

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-34-generic 3.2.0-34.53
ProcVersionSignature: Ubuntu 3.2.0-34.53-generic 3.2.33
Uname: Linux 3.2.0-34-generic i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu15
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  teo        2539 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebf8000 irq 49'
   Mixer name	: 'Realtek ALC660-VD'
   Components	: 'HDA:10ec0660,10430000,00100001 HDA:10573055,10431316,00100700'
   Controls      : 28
   Simple ctrls  : 16
Date: Sat Nov 24 14:12:51 2012
HibernationDevice: RESUME=UUID=b1b3e5fe-38e2-44c9-9e48-4564cd9f4d66
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: ASUSTeK Computer Inc. M51Sn
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-34-generic root=UUID=173acbf5-26a0-49e3-8d2b-f1c142582cbf ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-34-generic N/A
 linux-backports-modules-3.2.0-34-generic  N/A
 linux-firmware                            1.79.1
SourcePackage: linux
StagingDrivers: zram
UpgradeStatus: Upgraded to precise on 2012-05-17 (190 days ago)
UserAsoundrc:
 pcm.!default { type pulse }
 ctl.!default { type pulse }
 pcm.pulse { type pulse }
 ctl.pulse { type pulse }
dmi.bios.date: 12/24/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 303
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: M51Sn
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr303:bd12/24/2007:svnASUSTeKComputerInc.:pnM51Sn:pvr1.0:rvnASUSTeKComputerInc.:rnM51Sn:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: M51Sn
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.

** Affects: grub (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 package-from-proposed precise running-unity staging
-- 
Boot menu completely broken if external usb keyboard used (touch it and you won't be able to boot)
https://bugs.launchpad.net/bugs/1082654
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