External display won't display

[Michael Jonker]

Binary package hint: unity

I use my 50" Samsung plasma TV with my netbook as a media centre.This worked 100% in Lucid.

In Maverick (Unity) the display registers during start up and shut down sequences, but nothing in between (dead screen on the television). There is no setting for 'Monitors' in the system preferences - so I can't change the settings to test. Also, I can't find an Ubuntu supported app in the software centre to control this.

Apologies if I am missing something, if this is the case then this bug is a useability issue.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: unity 0.2.34-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
Uname: Linux 2.6.35-20-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Thu Sep 9 14:58:44 2010
InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Beta i386 (20100902.1)
ProcEnviron:
 LANG=en_IE.UTF-8
 SHELL=/bin/bash
SourcePackage: unity

[Omer Akram (om26er)]

does it work fine in gnome-session?

On Thu, Sep 9, 2010 at 7:19 PM, Michael Jonker <email address hidden>wrote:

>
> ** Attachment added: "Dependencies.txt"
>
> https://bugs.launchpad.net/bugs/634068/+attachment/1560787/+files/Dependencies.txt
>
> --
> External display won't display
> https://bugs.launchpad.net/bugs/634068
> You received this bug notification because you are subscribed to unity
> in ubuntu.
>
> Status in “unity” package in Ubuntu: New
>
> Bug description:
> Binary package hint: unity
>
> I use my 50" Samsung plasma TV with my netbook as a media centre.This
> worked 100% in Lucid.
>
> In Maverick (Unity) the display registers during start up and shut down
> sequences, but nothing in between (dead screen on the television). There is
> no setting for 'Monitors' in the system preferences - so I can't change the
> settings to test. Also, I can't find an Ubuntu supported app in the software
> centre to control this.
>
> Apologies if I am missing something, if this is the case then this bug is a
> useability issue.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 10.10
> Package: unity 0.2.34-0ubuntu1
> ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
> Uname: Linux 2.6.35-20-generic i686
> NonfreeKernelModules: wl
> Architecture: i386
> Date: Thu Sep 9 14:58:44 2010
> InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Beta i386
> (20100902.1)
> ProcEnviron:
> LANG=en_IE.UTF-8
> SHELL=/bin/bash
> SourcePackage: unity
>
>
>

[Michael Jonker (citizen-jonker)]

How do I test that?

[Omer Akram (om26er)]

logout, there select 'Ubuntu Desktop Edition' from the drop down menu, enter
your password and login. now connect the external display and see if your
external screen works.

On Thu, Sep 9, 2010 at 8:39 PM, Michael Jonker <email address hidden>wrote:

> How do I test that?
>
> --
> External display won't display
> https://bugs.launchpad.net/bugs/634068
> You received this bug notification because you are subscribed to unity
> in ubuntu.
>
> Status in “unity” package in Ubuntu: New
>
> Bug description:
> Binary package hint: unity
>
> I use my 50" Samsung plasma TV with my netbook as a media centre.This
> worked 100% in Lucid.
>
> In Maverick (Unity) the display registers during start up and shut down
> sequences, but nothing in between (dead screen on the television). There is
> no setting for 'Monitors' in the system preferences - so I can't change the
> settings to test. Also, I can't find an Ubuntu supported app in the software
> centre to control this.
>
> Apologies if I am missing something, if this is the case then this bug is a
> useability issue.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 10.10
> Package: unity 0.2.34-0ubuntu1
> ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
> Uname: Linux 2.6.35-20-generic i686
> NonfreeKernelModules: wl
> Architecture: i386
> Date: Thu Sep 9 14:58:44 2010
> InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Beta i386
> (20100902.1)
> ProcEnviron:
> LANG=en_IE.UTF-8
> SHELL=/bin/bash
> SourcePackage: unity
>
>
>

[Michael Jonker (citizen-jonker)]

Tested that with the following results:

In gnome-session the TV was not detected when the cable was plugged in.
I found the settings for monitor in the normal Ubuntu place, but the TV would only activate when the netbook monitor was de-activated.
Restarting with the TV plugged in had the TV active, but not the netbook monitor.
Restarting with the TV plugged out brought back normal display to the netbook.
Plugging TV back in had no effect
Restarting with TV plugged in now brought up the strange situation shown on the attached photo:

Note the mouse curser below the flash reflection - this will move no further to the right, but will move back onto the netbook screen.

[Mark Shuttleworth (sabdfl)]

 Michael

What's the output of xrandr -q ? When the TV is plugged in.

Mark

[Michael Jonker (citizen-jonker)]

This morning I started the netbook with the TV plugged in. Netbook screen was dead and TV good. (slightly different behaviour from last night) Output of xrandr -q was:

Screen 0: minimum 320 x 200, current 1360 x 768, maximum 4096 x 4096
VGA1 connected 1360x768+0+0 (normal left inverted right x axis y axis) 1102mm x 620mm
   1360x768 60.0*+
   1024x768 75.1 70.1 60.0
   800x600 72.2 75.0 60.3 56.2
   640x480 72.8 75.0 60.0
   720x400 70.1
LVDS1 connected (normal left inverted right x axis y axis)
   1024x600 60.0 +
   800x600 60.3 56.2
   640x480 59.9

I then restarted with the TV unplugged. Netbook screen was good again. I plugged in the TV and it came alive with the strange black screen and limited mouse pointer described above. Output of xrandr -q was:

Screen 0: minimum 320 x 200, current 1024 x 600, maximum 4096 x 4096
VGA1 connected (normal left inverted right x axis y axis)
   1360x768 60.0 +
   1024x768 75.1 70.1 60.0
   800x600 72.2 75.0 60.3 56.2
   640x480 72.8 75.0 60.0
   720x400 70.1
LVDS1 connected 1024x600+0+0 (normal left inverted right x axis y axis) 223mm x 125mm
   1024x600 60.0*+
   800x600 60.3 56.2
   640x480 59.9

[Mark Shuttleworth (sabdfl)]

OK, thanks Michael. What happens in either scenario if you type xrandr
--auto ?

Mark

[Michael Jonker (citizen-jonker)]

See attached photo for result of xrandr --auto

The mouse cursor will move no further to the right.

[Mark Shuttleworth (sabdfl)]

 On 10/09/10 10:26, Michael Jonker wrote:
> See attached photo for result of xrandr --auto
>
> The mouse cursor will move no further to the right.
>
> ** Attachment added: "IMAG0031.jpg"
> https://bugs.launchpad.net/ubuntu/+source/unity/+bug/634068/+attachment/1565013/+files/IMAG0031.jpg
>

[Mark Shuttleworth (sabdfl)]

And at that stage, xrandr -q says?

[Michael Jonker (citizen-jonker)]

Screen 0: minimum 320 x 200, current 1360 x 768, maximum 4096 x 4096
VGA1 connected 1360x768+1024+0 (normal left inverted right x axis y axis) 1102mm x 620mm
   1360x768 60.0*+
   1024x768 75.1 70.1 60.0
   800x600 72.2 75.0 60.3 56.2
   640x480 72.8 75.0 60.0
   720x400 70.1
LVDS1 connected 1024x600+0+0 (normal left inverted right x axis y axis) 223mm x 125mm
   1024x600 60.0*+
   800x600 60.3 56.2
   640x480 59.9

[Mark Shuttleworth (sabdfl)]

Interesting. It looks like it's getting confused, seeing the TV as 1368
wide so setting up to use that width, but then configuring a xinerama
spanning both monitors with the laptop on the left and the TV on the right.

Have you tried running gnome-display-properties?

Mark

[Michael Jonker (citizen-jonker)]

I think you are right about it getting confused. I ran gnome-display-properties and the various settings give varying and incorrect results. I have attached 4 screenshots to illustrate.

The only correct output I can get is when disabling either one of the displays. In this case the remaining display is correct.

I will file as a separate bug the issue that gnome-display-properties is not accessible through the GUI in Unity.

[Didier Roche-Tolomelli (didrocks)]

This one should be fixed with unity 0.2.42 adding multi monitor support.