Multiple monitors do not work on Mobility Radeon HD 3470

[Hezekiah Carty]

Binary package hint: xserver-xorg-video-ati

I am unable to enable multiple monitor support using a Dell Optiplex 780 desktop system with a Mobility Radeon HD 3470 with two monitors connected by displayport using displayport -> DVI adapters under Ubuntu 10.04 64bit. Once Ubuntu starts, the secondary monitor goes to sleep while the primary monitor functions as expected.

I have not installed the fglrx driver and I have not tweaked any xorg settings.

With the monitors set to clone in Gnome's monitor configuration, the primary monitor is on and the secondary is in standby. If I enable multi-monitor support, then the secondary monitor will turn on and the primary will turn off.

I expected/hoped that both monitors would work. For verification, both monitors do function properly under a dual-boot of Windows XP on the same hardware.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xserver-xorg-video-radeon 1:6.13.0-1ubuntu5
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic x86_64
Architecture: amd64
Date: Mon Jul 12 16:08:14 2010
DkmsStatus: Error: [Errno 2] No such file or directory
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
MachineType: Dell Inc. OptiPlex 780
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-23-generic root=UUID=aebfd0c5-64f0-40ff-b8a4-7649063e1204 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xserver-xorg-video-ati
dmi.bios.date: 09/01/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0C27VV
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd09/01/2009:svnDellInc.:pnOptiPlex780:pvr:rvnDellInc.:rn0C27VV:rvrA00:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 780
dmi.sys.vendor: Dell Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: x86_64
 kernel: 2.6.32-23-generic

[madbiologist (me-again)]

Is this still occurring on Ubuntu 10.10 "Maverick Meerkat"? What about on Ubuntu 11.04 "Natty Narwhal"?

[bugbot (bugbot)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.