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 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1565699 Title: Front VGA connector not showing output Status in xorg package in Ubuntu: New Bug description: 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1565699/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
