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Multiple monitor issue

  • 14-10-2011 07:01PM
    #1
    oscarBravo
    Technology & Internet Moderators Posts: 28,862 Mod ✭✭✭✭


    It finally occurred to me today to try plugging a second monitor into the VGA port on my PC (main monitor is on the DVI port), and presto! it shows up as a separate monitor on Ubuntu.

    Unfortunately, if I configure for multiple screens, it goes horribly pearshaped. Performance gets manky - dragging a window happens at roughly 1fps, for example - although small updates seem to happen quickly enough.

    If something affects the entire screen (say I hit the logo key to bring up the dashboard (running GNOME shell)) the whole screen is replaced by diagonal tearing, but as individual windows update, they re-paint properly, albeit slowly.

    The GPU is an Intel 82Q35 integrated graphics controller. Maybe it just can't hack doing 3D full-screen on two displays?

    Any ideas?


Comments

  • #2
    oscarBravo
    Technology & Internet Moderators Posts: 28,862 Mod ✭✭✭✭oscarBravo


    Bah. Solved my own issue.
    oscarBravo wrote: »
    Maybe it just can't hack doing 3D full-screen on two displays?
    The combined width of the displays exceeded 2048 pixels, which the GPU can't hack. I've rearranged the desktops so that one is above the other - it's not as intuitive, but it works.


  • #3
    Galen
    Closed Accounts Posts: 664 ✭✭✭Galen


    Was that Ubuntu 11.04? I spent all day yesterday fixing assorted faults in Ubuntu 11.10. Canonical have done a nice job with Unity in Ubuntu 11.10 (at least they've with ATI, I haven't tried with one of my nvidia cards). It's not bad at all - it just might be good to switch from Kubuntu.


  • #4
    oscarBravo
    Technology & Internet Moderators Posts: 28,862 Mod ✭✭✭✭oscarBravo


    The issue was the same before and after an upgrade from 11.04 to 11.10.


  • #5
    Galen
    Closed Accounts Posts: 664 ✭✭✭Galen


    I've never trusted OS upgrades since windoze 98.


  • #6
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭Khannie


    Is that problem down to the amount of RAM you have assigned in the bios? You might be able to get the wider desktop if you bump it up.


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  • #7
    oscarBravo
    Technology & Internet Moderators Posts: 28,862 Mod ✭✭✭✭oscarBravo


    I'll check that out, cheers Khannie.


  • #8
    oscarBravo
    Technology & Internet Moderators Posts: 28,862 Mod ✭✭✭✭oscarBravo


    The video RAM is maxed out already, but it seems to be a driver limitation: it can do a 4096x4096 virtual desktop, but once it goes over 2048x2048 it turns off direct rendering.


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