My display won't fill my (beautiful) monitor [RESOLVED]

My company got us very beautiful Dell Ultrasharp 27" monitors. I used to use xrandr --output HDMI2 --auto to move my display to an external monitor, but now when I try that, the display does not fill the entire screen. I've looked around for some advice and it seems maybe I need to append a transform setting to the command? But I don't know how to get the correct values for the transform.

https://www.youtube.com/watch?v=x40XnMGI75M

We need more details :wink:

I know very little about monitors; I can tell you the output of xrandr -q:

$ xrandr -q                                                                                                                                                                    Thu 09 Jan 2020 04:50:53 PM CST
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 350mm x 190mm
   3840x2160     60.00 +  59.97
   3200x1800     59.96    60.00    59.94
   2880x1620     60.00    59.96    59.97
   2560x1600     59.99    59.97
   2560x1440     59.96    60.00    59.95
   2048x1536     60.00
   1920x1440     60.00
   1856x1392     60.01
   1792x1344     60.01
   2048x1152     60.00    59.90    59.91
   1920x1200     59.88    59.95
   1920x1080     59.96*   60.00    59.93
   1600x1200     60.00
   1680x1050     59.95    59.88
   1400x1050     59.98
   1600x900      60.00    59.95    59.82
   1280x1024     60.02
   1400x900      59.96    59.88
   1280x960      60.00
   1368x768      60.00    59.88    59.85
   1280x800      59.81    59.91
   1280x720      59.86    60.00    59.74
   1024x768      60.00
   1024x576      60.00    59.90    59.82
   960x540       60.00    59.63    59.82
   800x600       60.32    56.25
   864x486       60.00    59.92    59.57
   640x480       59.94
   720x405       59.51    60.00    58.99
   640x360       59.84    59.32    60.00
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm panning 2560x1440+0+0
   2560x1440     59.95*+
   2048x1080     60.00    24.00
   1920x1080     60.00    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1280x1024     75.02    60.02
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x576i      50.00
   720x480       60.00    59.94
   720x480i      60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

...but I'll need hints as to what else might be useful.

https://archived.forum.manjaro.org/search?q=i3%20dual%20monitor

and more

Using i3 with multiple monitors - Fedora Magazine

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Are you using multiple monitors with your Linux workstation? Seeing many things at once might be beneficial. But there are often much more windows in our workflows than physical monitors β€” and that's a good thing, because seeing too many things at once might be distracting. So being able to switch what we see on […]

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I3 : Dual- Monitors , Different Resolutions [SOLVED] - Arch Linux

https://bbs.archlinux.org/viewtopic.php?id=210037

Re: I3 : Dual- Monitors , Different Resolutions [SOLVED] I don't have much experience with putting these settings in xorg.conf, but it looks like all the monitor settings are in there - so xrandr might not be able to change them dynamically.

display - i3 for dual- monitor on laptop - Ask Ubuntu

https://askubuntu.com/questions/912431/i3-for-dual-monitor-on-laptop

I am using i3 as the window manager on my laptop. Now I want it to work with my HDMI monitor . So far I have this is my .3/config: exec xrandr --output eDP1 --auto --output HDMI1 --auto --left-of eDP1 This works quite well but only as long as my HDMI monitor is plugged in.

Multihead - ArchWiki - Arch Linux

https://wiki.archlinux.org/index.php/Multihead

If you wish to attach more than two monitors or monitors attached to other video cards, you will need to use Xinerama instead of TwinView. Likewise, as of April 2012, both monitors must be in the same orientation - you cannot have one in landscape and the other in portrait mode.

i3 : i3 User's Guide - i3 - improved tiling wm

https://i3wm.org/docs/userguide.html

When you have more than one monitor , each monitor will get an initial workspace. The first monitor gets 1, the second gets 2 and a possible third would get 3. When you switch to a workspace on a different monitor , i3 will switch to that monitor and then switch to the workspace.

Now my ultrawide monitor shines with i3wm in the office! : linux

https://www.reddit.com/r/linux/comments/91qmp0/now_my_ultrawide_monitor_shines_with_i3wm_in_the/

My buddy used i3 for years, but I kind of assumed tiling WMs were a meme. I finally decided to give it a try, and quickly discovered just how wrong I was! After getting everything set up, I was totally accustomed to the keybinds in a day, and after a month or two I can't imagine going back to floating windows!

Hi.

If you want to use the external monitor alone, you can run this command:

xrandr --output HDMI2 --auto --output eDP1 --off

Also, you can read the manual of your monitor and check if its preferred resolution is actually 2560x1440. If it is different and is not listed by xrandr -q, you might have to add that resolution manually. See
https://wiki.archlinux.org/index.php/Xrandr#Adding_undetected_resolutions

1 Like

I mention the command xrandr --output HDMI2 --autoin my original post. The problem is that when run, the display does show something, but it doesn't fill the screen. I tried setting the resolution manually with xrandr --output HDMI2 --mode 2560x1440 with no change. The output of xrandr -q includes the line

HDMI2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm panning 2560x1440+0+0
   2560x1440     59.95*+

which implies that the resolution is detected. Perhaps it's the panning, but I don't know what the correct value for panning is in this case, and searching the forums for "monitor panning" gives me posts on monitor problems in general, rather than the specific issue. Finally, the word 'panning' does not appear in the xrandr page of ArchWiki.

My point is, I really have looked on my own and I'm still stuck. Can anyone suggest further paths to a solution?

Have you tried the menu from the monitor ? Something like autofill ?
I had this problem years ago, but it was a samsung.

Do you run i3 WM? Maybe the problem is not about xrandr or the monitor, but about i3? I'm not sure how it works with several monitors. Have you tried to disable your internal monitor when the extenal one is enabled?

Thank you for the suggestion, banjo. Alas, while there was a resize button on the monitor menu, pressing it caused a brief flash and then the same sizing issue.

Hey wow! That was the move, kainonergon: Disabling the internal monitor changed the size on the main monitor and now I am using the full screen.

Thanks, everyone!

1 Like

your laptop screen and external display have different aspect ratios, you should be able to use both if it's set properly

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