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#1 2015-12-01 07:04:18

ashh
Member
Registered: 2014-11-03
Posts: 5

“--scale 2x2” in xrandr causes the monitor to display nothing

I've got a 4k (hiDPI) external main monitor and I'm trying to connect a 1680x1050 external monitor to the left of it.

I've tried using:

     xrandr --output HDMI-0 --scale 2x2 --pos 0x0 --fb 7200x2160 --output DP-4 --pos 3360x0

which seems like it should work, and when I look at what the computer thinks is going on in nvidia-settings it correctly displays a 3200x2160 monitor to the left of my 4k one.

Jro2H.png

However on my external monitor just shows black with a flickering line at the top of it.

The only way I can correct this is to reset the scaling back to 1x1 at which point the image returns (while maintaining the X-server size. This means there's just deadspace that I have to scroll through to get between my monitors).

So I think the problem is specifically to do with the 2x2 scaling in xrandr. I'm not sure what to do?

Here's my xrandr output:

      Screen 0: minimum 8 x 8, current 7200 x 2160, maximum 16384 x 16384
      DVI-I-0 disconnected (normal left inverted right x axis y axis)
      DVI-I-1 disconnected (normal left inverted right x axis y axis)
      DP-0 disconnected (normal left inverted right x axis y axis)
      DP-1 disconnected (normal left inverted right x axis y axis)
      DP-2 disconnected (normal left inverted right x axis y axis)
      DP-3 disconnected (normal left inverted right x axis y axis)
      HDMI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
         1680x1050      59.9*+   60.0 
         1280x1024      75.0     60.0 
         1280x960       60.0 
         1152x864       75.0 
         1024x768       75.0     70.1     60.0 
         800x600        75.0     72.2     60.3     56.2 
         640x480        75.0     72.8     59.9 
      DP-4 connected primary 3840x2160+3360+0 (normal left inverted right x axis y axis) 527mm x 296mm
         3840x2160      60.0*+   30.0 
         2560x1440      60.0 
         2048x1280      60.0 
         1920x1200      59.9 
         1920x1080      60.0     60.0     59.9     50.0     24.0     60.0     50.0 
         1600x1200      60.0 
         1600x900       60.0 
         1280x1024      75.0     60.0 
         1280x720       60.0     59.9     50.0 
         1152x864       75.0 
         1024x768       75.0     60.0 
         800x600        75.0     60.3 
         720x576        50.0     50.1 
         720x480        59.9     60.1 
         640x480        75.0     59.9     59.9

Last edited by ashh (2015-12-01 07:05:18)

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#2 2016-11-20 11:04:28

lonaowna
Member
Registered: 2013-03-25
Posts: 28

Re: “--scale 2x2” in xrandr causes the monitor to display nothing

I have exactly the same problem. Scaling up to 1.5x1.5 seems to work here.
More people have this problem: http://askubuntu.com/questions/704503/s … y-anything

Edit: oops.. just noticed that that issue was likely opened by you yourself. Did you manage to find a solution?

Last edited by lonaowna (2016-11-20 11:08:14)

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#3 2016-11-20 12:48:36

seth
Member
Registered: 2012-09-03
Posts: 4,671

Re: “--scale 2x2” in xrandr causes the monitor to display nothing

While close to a necrobump, at least provide details on your specific situation.

xrandr -q
glxinfo -l

Which output you try to scale and on what desktop environment. This is usually just a hardware limitation in some field.

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#4 2016-11-20 12:59:03

WorMzy
Forum Moderator
From: Scotland
Registered: 2010-06-16
Posts: 7,411
Website

Re: “--scale 2x2” in xrandr causes the monitor to display nothing

As this topic is over a year old, and OP hasn't been seen since they started it, you're unlikely to get a response; please open a new topic for your issue.

Closing.


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