I have a Dell U2312HM monitor connected to a Dell Latitude E7440 laptop via a HDMI-DVI cable. I'm running it on Ubuntu 14.04. I had an issue with the monitor blinking from time to time (reported here), so I changed the cable which solved one issue, but created another. Sometimes the display on the monitor is just fine, but more often than not I'm getting this message: The current input timing is not supported by the monitor display. Please change your input timing to 1920x1080@60Hz or any other monitor listed timing as per the monitor specifications.

This is the output of xrandr:

HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080      60.0*+
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  

So it is running on the recommended resolution. This is the cable that works fine but causes blinking. I'm not sure what is the brand of the other one but the numbers on it suggest this.

How is this possible? What is different in these two cables that causes such differences?

  • Could you try DVI-DVI or HDMI-HDMI connection? – g2mk Nov 28 '15 at 19:04
  • @g2mk The laptop doesn't have a DVI output and the monitor doesn't have a HDMI input. – alkamid Nov 28 '15 at 19:10
  • Sorry... I have suspected this but don't bother to check it. It seems that U2312HM DVI is HDCP enabled so theoretically it should work. Unfortunately practically sometimes it isn't. You have a mDP-DP option still - this time I have checked it ;) – g2mk Nov 28 '15 at 19:32
  • Your previous cable might be better - see my comment to your prior question... – g2mk Nov 28 '15 at 19:43

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