Dual-head setup only possible with stacked screen combination

Bug #654515 reported by Sander Alberink on 2010-10-04
22
This bug affects 4 people
Affects Status Importance Assigned to Milestone
xserver-xorg-video-intel (Ubuntu)
Undecided
Unassigned

Bug Description

Binary package hint: xorg

TRying to setup a dual-head setup, with a laptop and a flat-panel TFT. Using the Monitor Preferences panel, I enable the TFT panel and place it to the right of the laptop screen. If I hit apply, the screen on the laptop shows the correct image, but the TFT panel remains black. The screen is on, though, as I can move the mouse-cursor to the TFT panel. The tip of the cursor keeps aligned to the left edge of the TFT panel, though.

The only way to get a working dual-head setup is to configure the screens in a stacked configuration, as shown in the attached screenshot. This, however, is a nuisance.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
DRM.card0.DVI.D.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1440x900
 edid-base64: AP///////wAyDOAAAAAAAAAQAQOAHhN4Cq4QllhTjCgkUFQAAAABAQEBAQEBAQEBAQEBAQEBuSKgoFCEGjAwIDYAML4QAAAYuSKgoFCEGjAwIDYAML4QAAAAAAAA/gBKVzgwNAAxNDFXUDEKAAAA/gAfLzc/b4ef1wIBCiAgAFY=
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x1024 1280x1024 1152x864 1024x768 1024x768 800x600 800x600 640x480 640x480 720x400
 edid-base64: AP///////wAQrCOgU1lLMSEQAQNoIht47u6Ro1RMmSYPUFSlSwBxT4GAAQEBAQEBAQEBAQEBMCoAmFEAKkAwcBMAUg4RAAAeAAAA/wBUSDYzNzY4RjFLWVMKAAAA/ABERUxMIEUxNzdGUAogAAAA/QA4Sx9QDgAKICAgICAgAHY=
Date: Mon Oct 4 13:55:14 2010
DkmsStatus:

EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
MachineType: Dell Inc. Latitude D620
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=72fed4c1-82b1-407e-85b2-2f6521fcf336 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 05/16/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.name: 0FT292
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA10:bd05/16/2008:svnDellInc.:pnLatitudeD620:pvr:rvnDellInc.:rn0FT292:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude D620
dmi.sys.vendor: Dell Inc.
system:
 distro: Ubuntu
 codename: maverick
 architecture: i686
 kernel: 2.6.35-22-generic

Dave Gilbert (ubuntu-treblig) wrote :

Hi Sander,
  My understanding is the Intel 945 chips have a 2048 horizontal maximum pixel limit; it can push 4096 pixels with a load of things disabled, but that's probably not a good idea; so 2048 is the maximum practical.

  I have the same problem on my laptop.

Marking Invalid because it's a hardware limitation (although I can imagine something should have told you).

Dave

affects: xorg (Ubuntu) → xserver-xorg-video-intel (Ubuntu)
Changed in xserver-xorg-video-intel (Ubuntu):
status: New → Invalid
Download full text (4.0 KiB)

Hi Dave,

I'm not sure I subscribe to this explanation. I had Lucid Lynx running on
this very same laptop and panel, and that was working without a hitch. To be
honest, I ran Kubuntu on that at the time, but technically this all seems to
work, it's just that Ubuntu doesn't take advantage. I will re-test this
using Kubuntu, to see if it works there.

On Mon, Oct 4, 2010 at 8:01 PM, Dave Gilbert <email address hidden> wrote:

> Hi Sander,
> My understanding is the Intel 945 chips have a 2048 horizontal maximum
> pixel limit; it can push 4096 pixels with a load of things disabled, but
> that's probably not a good idea; so 2048 is the maximum practical.
>
> I have the same problem on my laptop.
>
> Marking Invalid because it's a hardware limitation (although I can
> imagine something should have told you).
>
> Dave
>
> ** Package changed: xorg (Ubuntu) => xserver-xorg-video-intel (Ubuntu)
>
> ** Changed in: xserver-xorg-video-intel (Ubuntu)
> Status: New => Invalid
>
> --
> Dual-head setup only possible with stacked screen combination
> https://bugs.launchpad.net/bugs/654515
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “xserver-xorg-video-intel” package in Ubuntu: Invalid
>
> Bug description:
> Binary package hint: xorg
>
> TRying to setup a dual-head setup, with a laptop and a flat-panel TFT.
> Using the Monitor Preferences panel, I enable the TFT panel and place it to
> the right of the laptop screen. If I hit apply, the screen on the laptop
> shows the correct image, but the TFT panel remains black. The screen is on,
> though, as I can move the mouse-cursor to the TFT panel. The tip of the
> cursor keeps aligned to the left edge of the TFT panel, though.
>
> The only way to get a working dual-head setup is to configure the screens
> in a stacked configuration, as shown in the attached screenshot. This,
> however, is a nuisance.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 10.10
> Package: xorg 1:7.5+6ubuntu3
> ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
> Uname: Linux 2.6.35-22-generic i686
> Architecture: i386
> DRM.card0.DVI.D.1:
> status: disconnected
> enabled: disabled
> dpms: Off
> modes:
> edid-base64:
> DRM.card0.LVDS.1:
> status: connected
> enabled: enabled
> dpms: On
> modes: 1440x900
> edid-base64:
> AP///////wAyDOAAAAAAAAAQAQOAHhN4Cq4QllhTjCgkUFQAAAABAQEBAQEBAQEBAQEBAQEBuSKgoFCEGjAwIDYAML4QAAAYuSKgoFCEGjAwIDYAML4QAAAAAAAA/gBKVzgwNAAxNDFXUDEKAAAA/gAfLzc/b4ef1wIBCiAgAFY=
> DRM.card0.VGA.1:
> status: connected
> enabled: enabled
> dpms: On
> modes: 1280x1024 1280x1024 1152x864 1024x768 1024x768 800x600 800x600
> 640x480 640x480 720x400
> edid-base64:
> AP///////wAQrCOgU1lLMSEQAQNoIht47u6Ro1RMmSYPUFSlSwBxT4GAAQEBAQEBAQEBAQEBMCoAmFEAKkAwcBMAUg4RAAAeAAAA/wBUSDYzNzY4RjFLWVMKAAAA/ABERUxMIEUxNzdGUAogAAAA/QA4Sx9QDgAKICAgICAgAHY=
> Date: Mon Oct 4 13:55:14 2010
> DkmsStatus:
>
> EcryptfsInUse: Yes
> InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
> MachineType: Dell Inc. Latitude D620
> PccardctlIdent:
> Socket 0:
> no product info available
> PccardctlStatus:
> Socket 0:
> no card
> ProcCmdLine: BOOT_IMAGE=/boot/vml...

Read more...

Dave Gilbert (ubuntu-treblig) wrote :

Hi Sander,
  If you've got a config that worked in Lucid and doesn't in Maverick I'm happy to move this back from Invalid.
For your information, there is bug 651994 which is similar; I've not merged it because I think you have slightly different hardware.

Let me know what kubuntu does.

Dave

Dave Gilbert (ubuntu-treblig) wrote :

Hi,
  albert23 on #ubuntu-x has pointed out that your problem may well be bug 619663 - can you attach a /var/log/Xorg.0.log from when it is trying but failing to run with dual head monitor?
We're looking for an error like '(EE) intel(0): Failed to allocate framebuffer. '

Dave

Download full text (3.7 KiB)

Dave,

I'm away from the problematic laptop at the moment, but reading the
description my issue is the exact same one. The description of the bug is
precisely what I see. I think you can label my bug as a duplicate. I will,
however, take a look in my Xorg.0.log tomorrow and let you know the result.

Thanks for pointing this one out!

On Tue, Oct 5, 2010 at 8:11 PM, Dave Gilbert <email address hidden> wrote:

> Hi,
> albert23 on #ubuntu-x has pointed out that your problem may well be bug
> 619663 - can you attach a /var/log/Xorg.0.log from when it is trying but
> failing to run with dual head monitor?
> We're looking for an error like '(EE) intel(0): Failed to allocate
> framebuffer. '
>
> Dave
>
> --
> Dual-head setup only possible with stacked screen combination
> https://bugs.launchpad.net/bugs/654515
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “xserver-xorg-video-intel” package in Ubuntu: Invalid
>
> Bug description:
> Binary package hint: xorg
>
> TRying to setup a dual-head setup, with a laptop and a flat-panel TFT.
> Using the Monitor Preferences panel, I enable the TFT panel and place it to
> the right of the laptop screen. If I hit apply, the screen on the laptop
> shows the correct image, but the TFT panel remains black. The screen is on,
> though, as I can move the mouse-cursor to the TFT panel. The tip of the
> cursor keeps aligned to the left edge of the TFT panel, though.
>
> The only way to get a working dual-head setup is to configure the screens
> in a stacked configuration, as shown in the attached screenshot. This,
> however, is a nuisance.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 10.10
> Package: xorg 1:7.5+6ubuntu3
> ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
> Uname: Linux 2.6.35-22-generic i686
> Architecture: i386
> DRM.card0.DVI.D.1:
> status: disconnected
> enabled: disabled
> dpms: Off
> modes:
> edid-base64:
> DRM.card0.LVDS.1:
> status: connected
> enabled: enabled
> dpms: On
> modes: 1440x900
> edid-base64:
> AP///////wAyDOAAAAAAAAAQAQOAHhN4Cq4QllhTjCgkUFQAAAABAQEBAQEBAQEBAQEBAQEBuSKgoFCEGjAwIDYAML4QAAAYuSKgoFCEGjAwIDYAML4QAAAAAAAA/gBKVzgwNAAxNDFXUDEKAAAA/gAfLzc/b4ef1wIBCiAgAFY=
> DRM.card0.VGA.1:
> status: connected
> enabled: enabled
> dpms: On
> modes: 1280x1024 1280x1024 1152x864 1024x768 1024x768 800x600 800x600
> 640x480 640x480 720x400
> edid-base64:
> AP///////wAQrCOgU1lLMSEQAQNoIht47u6Ro1RMmSYPUFSlSwBxT4GAAQEBAQEBAQEBAQEBMCoAmFEAKkAwcBMAUg4RAAAeAAAA/wBUSDYzNzY4RjFLWVMKAAAA/ABERUxMIEUxNzdGUAogAAAA/QA4Sx9QDgAKICAgICAgAHY=
> Date: Mon Oct 4 13:55:14 2010
> DkmsStatus:
>
> EcryptfsInUse: Yes
> InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
> MachineType: Dell Inc. Latitude D620
> PccardctlIdent:
> Socket 0:
> no product info available
> PccardctlStatus:
> Socket 0:
> no card
> ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic
> root=UUID=72fed4c1-82b1-407e-85b2-2f6521fcf336 ro quiet splash
> ProcEnviron:
> PATH=(custom, user)
> LANG=en_US.utf8
> SHELL=/bin/bash
> SourcePackage: xorg
> Symptom: display
> dmi.bios.date: 05/16/2008
> dmi.bios.vendor: Dell Inc.
> dmi.bios.versi...

Read more...

dave tingley (dave-tingley) wrote :

I am also seeing this on a dell destop. This worked perfectly in jaunty and lucid but when i upgraded to Meerkat it stopped. When the monitors are positioned side by side the right screen is black and the cursor will move only a few pixels onto it. I changed the resolution from 1600x1200 all the way down to 640x480 and got the same results. If I tell it the screens are one over the other they both display properly.

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