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CID: 201404-14986 Dell Precision M2800

There is no desktop on the external monitor in extened mode through HDMI / D-Sub port.
But you can see your cursor there.

External monitor works nomally with Mirror / External Only mode.

Steps:
1. Install 14.04.1 + update (3.13.0-37) + fglrx-updates (2:13.350.1-0ubuntu2)
2. Connect a HDMI / VGA cable to an external monitor

Expected result:
* Display should work with the external  monitor in extended mode.

Actual result:
* Black screen on the external screen, the only thing you can see is the cursor.

ubuntu@201404-14986:~$ xrandr  -q
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1920x1080      60.1*+   40.0     59.9  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080      60.0*+   50.0     59.9  
   1920x1080i     60.1     50.0     60.0  
   1680x1050      59.9  
   1440x900       59.9  
   1280x960       60.0  
   1280x800       59.9  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1440x576i      50.1  
   1024x768       70.1     60.0  
   1440x480i      60.1     60.1  
   800x600        60.3     56.2  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        66.7     60.0     59.9  
   720x400        70.1  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-37-generic 3.13.0-37.64
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  ubuntu     1776 F.... pulseaudio
                      ubuntu     3242 F.... pulseaudio
 /dev/snd/controlC0:  ubuntu     1776 F.... pulseaudio
                      ubuntu     3242 F.... pulseaudio
CRDA:
 country TW:
 	(2402 - 2472 @ 40), (3, 27)
 	(5270 - 5330 @ 40), (3, 17), DFS
 	(5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Thu Oct  9 04:56:04 2014
HibernationDevice: RESUME=UUID=404890af-28cf-4569-a49d-10fc2fcf1cf9
InstallationDate: Installed on 2014-10-09 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Precision M2800
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic.efi.signed root=UUID=c670a1f7-2c9c-4fd2-9d34-a750d36d46b9 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-37-generic N/A
 linux-backports-modules-3.13.0-37-generic  N/A
 linux-firmware                             1.127.7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/28/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0CYT5F
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd04/28/2014:svnDellInc.:pnPrecisionM2800:pvr01:rvnDellInc.:rn0CYT5F:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Precision M2800
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: fglrx-installer-updates (Ubuntu)
     Importance: Medium
     Assignee: Anthony Wong (anthonywong)
         Status: New


** Tags: 201404-14986 amd64 apport-bug blocks-hwcert taipei-lab trusty
-- 
AMD Mars XTX [Radeon HD 8790M] [1002:6606] Black screen on external display (extended mode) with fglrx
https://bugs.launchpad.net/bugs/1379237
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