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Since the install of Ubuntu 16.04, I can't configure the display of a Dell P2416D to QHD resolution (2560x1440). Note that it was working fine with 14.04. The video card is a GeForce GT 750M/PCIe/SSE2.

All 3 additional drivers have been tested to no avail:

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NVIDIA X Server Settings utility is unable to detect displays correctly:

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Command Xrandr outputs the following:

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  • Please add the output of xrandr to your question using a code block ({} button).
    – dessert
    Sep 20, 2017 at 10:45
  • @dessert I've updated the post accordingly. Note however that I'm not looking for a tweak using Xrandr or a similar method.
    – David
    Sep 20, 2017 at 13:26
  • What's wrong with xrandr? I think you need to edit your question and add details about what you want here.
    – dessert
    Sep 20, 2017 at 13:31
  • I agrre that using Xrandr to add the missing configuration would probably fix the issue. Now, I'd really like to understand why a brand new 16.04 install does not support the resolution whereas 14.04 does. Something looks wrong with the driver, don't you think?
    – David
    Sep 20, 2017 at 13:51
  • Well then why didn't you say so in your question? Don't you think it worked in 14.04 is crucial information? Please edit and explain your question!
    – dessert
    Sep 20, 2017 at 13:54

1 Answer 1

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To add a missing resolution, first calculate the VESA Coordinated Video Timing mode using cvt like so:

$ cvt 2560 1440
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

Then register this new mode using the calculated modeline, I use qhd as a name here:

xrandr --newmode qhd 312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

According to your xrandr output the screen for which you want to add the resolution is eDP-1-1, so now add the mode to this output using:

xrandr --addmode eDP-1-1 qhd

Now the resolution should be available in GUI tools and can be chosen there. To set it with xrandr do:

xrandr --output eDP-1-1 --mode qhd
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