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Thread: Cannot even get 1280x1024 through DVI (but yes on VGA!)

  1. #1
    Join Date
    Jul 2011
    Posts
    2

    Default Cannot even get 1280x1024 through DVI (but yes on VGA!)

    Crazy stuff here, it's 2011 and despite a new PC, new Linux OS (CentOS 6), new video cabling (DVI), I cannot even get 1280x1024 through DVI. But it works when I switch over to VGA (but that's somewhat fuzzier, hence the incentive to stay with DVI). After 8 long hours of every conceivable test I can think of (short of source code analysis/recompilation), I'm here asking for your experience.

    We have three new HP Z210 workstations (i7-2600) with the default onboard graphics output (Sandy Bridge Integrated Graphics Controller, as seen by lspci -v) and a single DVI connector. When I connect analog video (through a DVI-VGA adapter to some Dell Ultrasharp 4:3 displays (1901FP or 1800FP) on the VGA input), I can easily get the desired native resolutions of these monitors (1280x1024) using

    gnome-display-properties
    xrand
    system-config-display

    However switching over to pure digital video (DVI-D), Linux refuses, complains, and just fails at providing this very basic resolution.

    Tried on:
    CentOS 5.6 (32 bits): This is our main corporate OS that I have to get it working on
    CentOS 5.6 (64 bits)
    CentOS 6 (64 bits)
    Ubuntu 10.04

    and it's the same problem on each of them.

    On Windows 7, there is no such problem. Therefore it is absolutely a Linux OS-based problem.

    I made endless attempts at changing /etc/X11/xorg.conf followed by gdm-restart, endless xrandr commands, cvt and gtf commands, and even modifying grub.conf with kernal arguments (vga=795 should give 1280x1024@24bpp). And did so much analysis of Xorg.0.log which basically leads me to believe these OSes are not sufficiently aware of this new Sandy Bridge Integrated Graphics Controller, in that VESA detection is not any good.

    My ultimate question is, has anyone successfully driven an LCD screen at >1024x768 with DVI using CentOS 5.6 on a machine with the Sandy Bridge Integrated Graphics Controller? If so please reveal your secret (xorg.conf, etc.).

    Many thanks in hope of a response...

  2. #2
    Join Date
    Oct 2008
    Location
    Sweden
    Posts
    983

    Default

    Why don't you get it straight from the horse's mouth and ask Intel directly?

    File a bug http://intellinuxgraphics.org/how_to_report_bug.html and/or ask on the mailing list http://lists.freedesktop.org/mailman/listinfo/intel-gfx

  3. #3
    Join Date
    Aug 2007
    Posts
    6,683

    Default

    Most likely you use a fully outdated kernel/ddx.

  4. #4
    Join Date
    Jul 2011
    Posts
    2

    Default Ubuntu 11 does it right off the bat

    Tried Ubuntu 11 and bang, 1280x1024.

    Absolute proof that the "new" CentOS 6 left out proper support for the new graphics chip.

    Now I wonder how much effort it is to get CentOS 5.6 to do the support...

    Quote Originally Posted by jgoulet View Post
    Tried on:
    CentOS 5.6 (32 bits): This is our main corporate OS that I have to get it working on
    CentOS 5.6 (64 bits)
    CentOS 6 (64 bits)
    Ubuntu 10.04

    and it's the same problem on each of them.
    ...

  5. #5
    Join Date
    Feb 2008
    Location
    Linuxland
    Posts
    5,338

    Default

    For an enterprise distro and such new hw, you'll likely see support in CentOS 7.

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