Front VGA connector not showing output

[Claudio Kuenzler]

Installation and booting is shown correctly on monitor when connected to servers (a Dell PowerEdge 1850) front VGA connector. However after the boot process is completed and the login prompt should show up, the monitor doesn't display anything anymore (black) - as if there is no input.

On dmesg I found the following errors:

[ 62.364246] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 34
[ 62.364385] Raw EDID:
[ 62.364419] 00 ff ff ff ff ff ff 00 10 ac 07 a0 4c 4b 34 30
[ 62.364494] 04 0f 01 03 0e 29 1f 78 ee 63 90 a3 57 4b 9b 25
[ 62.364575] 11 50 54 a5 4b 00 81 80 a9 40 71 4f 01 01 01 01
[ 62.364655] 01 01 01 01 01 01 48 3f 40 30 62 b0 32 40 40 c0
[ 62.364736] 13 00 6f 13 11 00 00 1e 00 00 00 ff 00 43 30 38
[ 62.364817] 38 31 35 31 49 30 34 4b 4c 20 00 00 00 fc 00 44
[ 62.364892] 45 4c 4c 20 32 30 30 31 46 50 09 ff ff ff ff ff
[ 62.364966] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 62.366200] [drm:radeon_vga_detect [radeon]] *ERROR* VGA-2: probed a monitor but no|invalid EDID
[ 62.427863] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 199
[ 62.427991] Raw EDID:
[ 62.428038] 00 ff ff ff ff ff ff 00 10 ac 07 a0 4c 4b 34 30
[ 62.428147] 04 0f 01 03 0e 29 1f 78 ee 63 90 a3 57 4b 9b 25
[ 62.428245] 11 50 54 a5 4b 00 81 80 a9 40 71 4f 01 01 01 01
[ 62.428355] 01 01 01 01 01 01 48 3f 40 30 62 b0 32 40 40 c0
[ 62.428444] 13 00 6f 13 11 00 00 1e 00 00 00 ff 00 43 30 38
[ 62.428542] 38 31 35 31 49 30 34 4b 4c 20 00 00 00 fc 00 44
[ 62.428635] 45 4c 4c 20 32 30 30 31 46 ff ff ff ff ff ff ff
[ 62.428732] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 62.429959] [drm:radeon_vga_detect [radeon]] *ERROR* VGA-2: probed a monitor but no|invalid EDID

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg (not installed)
ProcVersionSignature: Ubuntu 4.2.0-27.32~14.04.1-generic 4.2.8-ckt1
Uname: Linux 4.2.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Mon Apr 4 13:03:27 2016
InstallationDate: Installed on 2016-04-04 (0 days ago)
InstallationMedia: Ubuntu-Server 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)

[Claudio Kuenzler (napsty)]

Same problem after running dist-upgrade. I see the login prompt for around 1 second before it disappears.
dmesg error:

[ 83.242723] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 142
[ 83.242872] Raw EDID:
[ 83.242905] 00 ff ff ff ff ff ff 00 10 ac 07 a0 4c 40 00 00
[ 83.242986] 00 00 00 00 00 00 00 00 00 00 00 00 00 07 ff ff
[ 83.243061] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 83.243141] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 83.243222] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 83.243297] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 83.243378] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 83.243453] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 83.244719] [drm:radeon_vga_detect [radeon]] *ERROR* VGA-2: probed a monitor but no|invalid EDID
[ 91.246961] init: tty1 main process ended, respawning