Public bug reported:

SIGNAL: NOT VALID
CABLE CONNECTED OK
92.6KHZ 58HZ


Is what I see on the monitor during the entire Xubuntu boot up process, 
although shut-down is fine and visible all the time.

monitor is DELL P790

if it helps then I can attach an old xorg.conf file

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-14-generic 3.0.0-14.23
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ylle       1480 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xfb000000 irq 22'
   Mixer name   : 'Realtek ALC883'
   Components   : 'HDA:10ec0883,1458c601,00100002'
   Controls      : 40
   Simple ctrls  : 22
Date: Fri Dec 30 12:54:08 2011
HibernationDevice: RESUME=UUID=260563e5-9a5b-4e9b-a39c-cb837b6dd9d0
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. M61SME-S2
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-generic 
root=UUID=99d1ac41-0260-4d1a-8d0b-bb5738877ac3 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-14-generic N/A
 linux-backports-modules-3.0.0-14-generic  N/A
 linux-firmware                            1.60
RfKill:
 
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/15/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F9
dmi.board.name: M61SME-S2
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd07/15/2008:svnGigabyteTechnologyCo.,Ltd.:pnM61SME-S2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnM61SME-S2:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: M61SME-S2
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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


** Tags: amd64 apport-bug oneiric

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https://bugs.launchpad.net/bugs/910064

Title:
  monitor says "SIGNAL: NOT VALID" during boot up process

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