i3: Output width/height wrong with Nvidia borders/underscan

I’m submitting a…

[x] Bug
[ ] Feature Request
[ ] Documentation Request
[ ] Other (Please describe in detail)

Current Behavior

1. Via nvidia-settings, configure the outputs so there are borders around the image (sometimes called underscore, or offset). E.g.:

DPY-1: 2880x1620 @2684x1509 +0+0 {
  ViewPortIn=2684x1509,
  ViewPortOut=2684x1509+98+55
}

1. i3 does not detect the correct output output size of 2684x1509, instead it has 2880x1620 (i.e., ignoring the underscore). As a result, windows and bars overflow the to the right and bottom. I can’t move my mouse outside the visible screen, indicating that X knows the right size.

Note: Borders are handled correctly by Awesome, Qtile, and XMonad

peter@taffer ~ % i3-msg -t get_outputs | python -m json.tool
[
    {
        "name": "xroot-0",
        "active": false,
        "primary": false,
        "rect": {
            "x": 0,
            "y": 0,
            "width": 4800,
            "height": 1620
        },
        "current_workspace": null
    },
    {
        "name": "DP-0",
        "active": true,
        "primary": false,
        "rect": {
            "x": 0,
            "y": 0,
            "width": 2880,
            "height": 1620
        },
        "current_workspace": "1"
    },
    {
        "name": "DP-3",
        "active": false,
        "primary": false,
        "rect": {
            "x": 2880,
            "y": 0,
            "width": 1920,
            "height": 1080
        },
        "current_workspace": null
    }
]

Expected Behavior

After configuring borders/underscan, i3 would detect the correct display size that takes into account the borders and all windows and bars would fit on screen.

Reproduction Instructions

1. Nvidia card and drivers

• Driver version: 430.14
• Card: GeForce GTX 970M

1. Configure borders some borders. E.g.,:

$ nvidia-settings --assign CurrentMetaMode='2880x1620 @2684x1509 {ViewPortIn=2684x1509, ViewPortOut=2684x1509+98+55}'

1. Look at the right and bottom of windows and bars

Environment

Output of i3 --moreversion 2>&-:

Binary i3 version:  4.16.1 (2019-01-27) © 2009 Michael Stapelberg and contributors
Running i3 version: 4.16.1 (2019-01-27) (pid 3792)abort…)
Loaded i3 config: /home/peter/.config/i3/config (Last modified: Mon 27 May 2019 13:42:56 BST, 665 seconds ago)

The i3 binary you just called: /usr/bin/i3
The i3 binary you are running: i3

Tested with no config, Arch stock, and custom. Exactly the same

Logfile URL: https://logs.i3wm.org/logs/5737248813219840.bz2

- Linux Distribution & Version: Arch Linux, updated
- Are you using a compositor (e.g., xcompmgr or compton): no