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Old 08-16-2010, 07:27 AM   #1
Registered: Jun 2009
Distribution: Slackware 12.2/13.1
Posts: 41

Rep: Reputation: 16
xrandr/krandr reports two of the same refresh rates.

When I use krandr to set my resolution to 1920x1080 it shows two of the same refresh rates (60hz) like this:

When I choose the first 60hz option the picture doesn't fill my monitor (large black bars on the side)
But the second option works fine.

My problem is when I want to manually set the resolution with xrandr it defaults to the first 60hz option and I have no idea how can I get xrandr to use the second 60hz option(If that makes sense, also why are the same refresh rates producing different outputs?)

Here is what 'xrandr -q --verbose' reports (0x44 is the 1920x1080 option that actually works properly)
xrandr -q --verbose
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 4096 x 4096
VGA1 connected 1920x1080+0+0 (0x44) normal (normal left inverted right x axis y axis) 708mm x 398mm
        Identifier: 0x41
        Timestamp:  731492
        Subpixel:   unknown
        CRTC:       0
        CRTCs:      0 1
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
  1360x768 (0x42)   85.5MHz +HSync +VSync +preferred
        h: width  1360 start 1424 end 1536 total 1792 skew    0 clock   47.7KHz
        v: height  768 start  771 end  777 total  795           clock   60.0Hz
  1920x1080 (0x43)  172.8MHz -HSync +VSync
        h: width  1920 start 2040 end 2248 total 2576 skew    0 clock   67.1KHz
        v: height 1080 start 1081 end 1084 total 1118           clock   60.0Hz
  1920x1080 (0x44)  136.5MHz +HSync +VSync *current
        h: width  1920 start 1952 end 1984 total 2048 skew    0 clock   66.7KHz
        v: height 1080 start 1081 end 1084 total 1111           clock   60.0Hz


Last edited by Interject; 08-20-2010 at 09:12 AM.
Old 08-16-2010, 08:15 AM   #2
Registered: Jun 2009
Distribution: Slackware 12.2/13.1
Posts: 41

Original Poster
Rep: Reputation: 16
Figured it out.
1. Grab the hex value for the resolution you want, 0x44 in my case
2. run 'xrandr --output VGA --mode 0x44'
(Change VGA to whatever your display is called VGA1 etc...)


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