CentOS 7 Anaconda GUI Resolution

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Greetings! I tried installing CentOS v7 (1406) to an old spare machine, and the video card apparently don’t play well with X. It is incorrectly saying that either monitor I connect is only able to support 640×480, when one is 1024×768 and the other supports a higher
(but now forgotten) resolution. In no way do I expect a fix to be added just to support my antique. :)

What I’d like to find, or have added to future CentOS installation discs, is a way to force the GUI resolution. Alternately, if nothing below 800×600 will show the GUI properly perhaps the installer should just forcibly set that as the minimum, no matter what the hardware claims to allow?

Details of the hardware and such follow, let me know if you need more.
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Under the normal boot from the normal DVD, graphics-mode output is discolored and squashed to the left of the display. In the “Basic Graphics” troubleshooting mode the output is clear and proper, but still just 640×480.

Server: Gateway E-9422R
Video card: Matrox Graphics MGA G200e, PCI 102b:0522

I captured the output of lspci, dmidecode, /tmp, and /var/log in both Normal and Basic Graphics boot modes. The file is 1,692,776 bytes and has the following SHA1 checksum:

f9cd800ced963e29d0bb3e4381596dc3b61a4c4c
*CentOS7_InstallerResolutionProblem.tar.xz

It can be downloaded from this link:
http://s000.tinyupload.com/index.php?file_idU151826488339350948

Daniel Johnson djohnson@progman.us
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2 thoughts on - CentOS 7 Anaconda GUI Resolution

  • There is a basic video install in the 3rd selection when you boot the iso .. in the “Troubleshooting” section. You might give that a try and see if it works better after boot of the OS. The anaconda drivers are a subset of the drivers for the distro, so it might work better after initial.

    Might also try one of the LiveGnome or LiveKDE isos.


  • Thanks! I did try Basic Graphics before, and while it made the image clear and distortion-free it was still 640×480.

    While browsing bugs.CentOS.org I saw a reference to using “vgaw3” to fix the resolution in VMware Fusion/Workstation, but it had no effect on the physical server’s GUI when I tried it.

    The same bug post mentioned putting “text” on the kernel line. I
    didn’t think that was supported on CentOS 7, should that be in the Troubleshooting menu too? I’m using that to get the server at least basically loaded for now, I’ll go back later and tweak the auto-generated KS file to re-install the way I want it.

    [https://bugs.CentOS.org/view.php?ids13]

    Daniel Johnson djohnson@progman.us

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