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[Solved] X won't recognize all resolutions on DisplayPort
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guido-pe
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Joined: 10 May 2004
Posts: 62

PostPosted: Fri Jan 03, 2014 7:31 pm    Post subject: [Solved] X won't recognize all resolutions on DisplayPort Reply with quote

Hi,

For some reason, X will not recognize all possible resolutions on my monitor if connected via DisplayPort. The xrandr output looks like this:
Code:

DisplayPort-0 connected (normal left inverted right x axis y axis)
   1280x1024      75.0     60.0 
   1280x960       60.0 
   1280x800       59.8 
   1152x864       75.0 
   1024x768       75.1     70.1     60.0 
   832x624        74.6 
   800x600        72.2     75.0     60.3     56.2 
   640x480        75.0     72.8     66.7     60.0     59.9 
   720x400        70.1


meaning I cannot select any resolution above 1280x1024.

With the same (model of) monitor connected via DVI, it looks like this:

Code:

DVI-0 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   2560x1440      60.0*+
   1920x1200      60.0 
   1920x1080      60.0     50.0     59.9 
   1600x1200      60.0 
   1680x1050      59.9 
   1280x1024      75.0     60.0 
   1440x900       59.9 
   1280x960       60.0 
   1280x800       59.9 
   1152x864       75.0 
   1280x720       60.0     50.0     59.9 
   1024x768       75.1     70.1     60.0 
   832x624        74.6 
   800x600        72.2     75.0     60.3     56.2 
   720x576        50.0 
   720x480        60.0     59.9 
   640x480        75.0     72.8     66.7     60.0     59.9 
   720x400        70.1


Microsoft Windows 7, running on the same machine, can find and use all the supported resolutions for all of my monitors.

I'm using an ATI/AMD Radeon HD5870 graphics card with the Open Source ati driver (x11-drivers/xf86-video-ati-7.2.0) and Linux 3.12.3.

Anybody know what's going wrong here or how I can make this work as it should again?
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guido-pe
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Joined: 10 May 2004
Posts: 62

PostPosted: Tue Jan 07, 2014 9:11 am    Post subject: Reply with quote

This was a configuration problem. I still had an old monitor section in my xorg.conf for a monitor I hadn't been using in a long time, and since I didn't have to touch xorg.conf in years, I pretty much forgot I even had it. For some reason the monitor section would override the values X auto-detected for the monitor on DisplayPort but not for the one on DVI.

Deleting xorg.conf solved the problem. These days, xorg doesn't need an explicit config file anyway.
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