screen mirrored

[Daniel Milde]

The screen is mirrored on ordinary notebooks (tried Asus EEE PC and Lenovo 3000 N200).

[Alkis Georgopoulos (alkisg)]

I've seen this happen when the proprietary nvidia drivers are installed on the server, and the clients have intel graphics cards. I think the nvidia drivers install their own versions of the opengl libs, and that somehow messes with xrandr etc.

Please do an lspci -nn on both the server and the clients, and also specify if you use any proprietary drivers.

One way around it that worked for some people was to disable compiz (System > Preferences > Appearance > Visual Effects: None - or something like that, I got localized menus). But that's a per-user settings, kind of difficult to do that for all users.

You could also try to put XRANDR_REFLECT_0 = y in your lts.conf.

But if the proprietary drivers are indeed the problem, then probably the best way would be to uninstall them, and restore the original opengl libs...

[Daniel Milde (daniel-milde)]

Yes, that is the case. On server are Nvidia driver and on clients are Intel graphic cards.

[Dale (drbeams)]

I'm not sure why this was marked invalid. There are a large number of issues that appear to be caused from having NVidia driver on the server and Intel on the clients. Currently, I have issues related to that mixture of hardware.

When investigating the issue, it was my understanding that Ubuntu dropped support for Intel Video i820 (?) out of the kernel.

> Date: Sat, 3 Oct 2009 19:14:14 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: [Bug 441586] Re: screen mirrored
>
> Yes, that is the case. On server are Nvidia driver and on clients are
> Intel graphic cards.
>
> ** Changed in: ltsp (Ubuntu)
> Status: Incomplete => Invalid
>
> --
> screen mirrored
> https://bugs.launchpad.net/bugs/441586
> You received this bug notification because you are a member of Edubuntu
> Bugsquad, which is subscribed to ltsp in ubuntu.

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[Daniel Milde (daniel-milde)]

I marked it invalid, bacause it's probably more fault of nvidia drivers than of package ltsp. I am not sure, if the bug should still be placed here.

[Stéphane Graber (stgraber)]

When the nvidia driver is installed on the server, libGL and a few other files are overridden.
The only way to solve that issue is to have nvidia stop overriding libGL and these other files, in short, nothing we can really fix (as it's proprietary).

I'm marking it as won't fix for ltsp. Thanks for your time.

[Jeremy Bícha (jbicha)]

In case others experience this problem:

My server uses a nvidia GeForce 6150SE. Turning off visual effects in my guest (Acer Aspire One with Intel 950GMA) works. As a longer-term solution, I reverted from the nvidia-glx-185 driver to the open source nouveau driver which doesn't support the Compiz visual effects.

[Alkis Georgopoulos (alkisg)]

Just noting down the command to disable compiz for all users, which works around this bug:

  sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /desktop/gnome/session/required_components/windowmanager metacity

[Phil Burrows (phil-birminghamfoe)]

I have tried all of the above and yet some of my thin clients aren't co-operating still. They are all old Dell Optiplex P3s, but some of them are detecting the monitor (the ones installed before the upgrade to Lucid) correctly and some aren't (the ones that I installed after). Any suggestions of how to work out what is going wrong?

[samuel (samuel-h)]

This happens to me on a desktop computer after I botched an install of some nvidia drivers. I am unable to run unity, It just displays the kernel messages it usually does when logging me out the shows me the login screen, the same thing happens if I run /usr/lib/nux/unity_support_test -p after logging into a 2d session that runs metacity. When I try and run compiz --replace from the 2d session I my desktop flips and window decoration goes very strange (the exit minimise and close buttons go the side for instance). I am pretty certain it's a driver issue and I am going to try doing this:
switch to a terminal using ctr+alt+f1
stop x: /etc/init.d/lightdm stop
uninstalling the nvidia drivers using nvidia-installer --uninstall
remove any leftovers: apt-get purge nvidia*
reinstall mesa and x apt-get install --reinstall xserver-xorg-core xserver-xorg-core libgl1-mesa-glx libgl1-mesa-dri
restart the computer: reboot