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GDM3 starts only on one X Screen of two
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krokoziabla
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Joined: 09 May 2013
Posts: 39
Location: Russia

PostPosted: Thu Jan 16, 2014 2:34 pm    Post subject: GDM3 starts only on one X Screen of two Reply with quote

I have a multi-head environment:
Code:

Section "ServerLayout"
    Identifier          "Default"
    Screen              "Left" 0 0
    Screen              "CentreAndRight" RightOf "Left"
EndSection



Section "Screen"
    Identifier          "CentreAndRight"
    Device              "hd6850"
EndSection

Section "Screen"
    Identifier          "Left"
    Device              "hd2000"
EndSection



Section "Device"
    Identifier          "hd6850"
    Driver              "radeon"
    BusID               "PCI:1:0:0"
EndSection

Section "Device"
    Identifier          "hd2000"
    Driver              "intel"
    BusID               "PCI:0:2:0"
EndSection


As you can see I define two "Screen" sections since I have two video cards. The problem is that GDM3 starts GNOME session only on the first met Screen of the layout (I tried to swap them and the session was started on the other Screen).

Xorg.0.log says that there is no problem with any Screen. And indeed after I log in, the mouse pointer moves between one monitor with GNOME on it and two other black monitors. And for instance xrandr tool tells that there are indeed two screens and the monitors are identified correctly. So this makes me think that there's no problem with Xorg server but it is GDM3 which doesn't behave properly. Another strange thing is that if I want to get the value of DISPLAY variable on the Screen with GNOME I get ":0" instead of ":0.0". GDM logs also confirm that it is GDM who sets this value.

One more word about GDM2. Before upgrade to GNOME 3 I had no problem with GDM and could use all the three monitors simultaneously with the same xorg.conf So does GDM3 need to be configured differently?

BTW, I have default settings for GDM3.

I would be glad too to get a link to some really good and descriptive documents about GDM and X because the official ones seem to be very scanty and mostly low-level.
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Roman_Gruber
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Joined: 03 Oct 2006
Posts: 3806
Location: Austro Bavaria

PostPosted: Sat Jan 18, 2014 6:50 pm    Post subject: Reply with quote

Hi for myself there are some open questions. Maybe I have understood it wrong or got it wrong.

Please clarify:

Do you want the login manager to appear on all of your physical screens or on only one?

Or does the gnome environment after succesful login only appears on one of your 2 / 3 screens?

You make different statements the heading says 2 screens and later you write you have 3 screens?


I read somewhere else that users use twinview for multiple monitor setups. Maybe it is this what you need.

I assume the config file you posted is your xorg.config right?
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krokoziabla
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Joined: 09 May 2013
Posts: 39
Location: Russia

PostPosted: Sun Jan 19, 2014 7:50 am    Post subject: Reply with quote

@tw04l124,

I'm using term "Screen" taken from X, that is a binding between a video card (DEVICE SECTION) and one or several monitors connected to it (MONITOR SECTION). I have two video cards: integrated Intel (1 monitor connected) and ATI (2 monitors connected).

I don't care much about how many displays GDM occupies itself but it is important for me that GDM would launch two gnome sessions for both X Screens I have (that is one gnome session would be dsplayed on one monitor and the other on the other two).

Yes, this is my /etc/X11/xorg.conf

If I'm not mistaken TwinView is a technology of NVdia but I have an ATI video card.

The key thing I don't understand is why GDM3 behaves differently to GDM2.
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