Public bug reported:

I have two cases :
→ after GRUB, i I have a black screen (no plymouth, no gdm), I can just reboot 
with ctrl+alt+suppr
note: the mute LED becomes orange

→ I randomly press the contrast key up during the boot, plymouth doesn't 
appear, but i can log in
note: the mute LED doesn't light (it's the expected behavior)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 Cannot stat file /proc/4661/fd/41: Stale NFS file handle
 Cannot stat file /proc/4661/fd/42: Stale NFS file handle
                      USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ubuntu     4637 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xc4500000 irq 45'
   Mixer name   : 'IDT 92HD81B1X5'
   Components   : 'HDA:111d7605,103c1486,00100402'
   Controls      : 14
   Simple ctrls  : 9
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xc4420000 irq 46'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,00aa0100,00100200'
   Controls      : 4
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Sun Apr  3 13:26:17 2011
Frequency: Once a day.
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110403)
MachineType: Hewlett-Packard HP TouchSmart tm2 Notebook PC
ProcEnviron:
 LANGUAGE=fr_FR:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent 
file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet 
splash -- debian-installer/language=fr keyboard-configuration/layoutcode?=fr 
keyboard-configuration/variantcode?=oss
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic  N/A
 linux-firmware                            1.49
SourcePackage: linux
StagingDrivers: brcm80211
Title: [STAGING]
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/16/2010
dmi.bios.vendor: Insyde
dmi.bios.version: F.13
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1486
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 83.1A
dmi.chassis.asset.tag: CNU0363P44
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnInsyde:bvrF.13:bd08/16/2010:svnHewlett-Packard:pnHPTouchSmarttm2NotebookPC:pvr058A210000242A10000120100:rvnHewlett-Packard:rn1486:rvr83.1A:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP TouchSmart tm2 Notebook PC
dmi.product.version: 058A210000242A10000120100
dmi.sys.vendor: Hewlett-Packard

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


** Tags: amd64 apport-bug kernel-config natty needs-upstream-testing 
regression-release running-unity staging

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https://bugs.launchpad.net/bugs/749361

Title:
  [STAGING] Black screen on boot

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