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I've got a fresh install of Kubuntu, have installed the nvidia drivers and set the framerate to 155 from within KDE using their settings GUI. Which worked great.

Upon installing i3wm, logging out and logging back in I've noticed that my monitor is now only running at 60fps (the monitor has a framerate indicator).

I can't see anywhere to set the framerate from within the i3 config file (below).

My i3 version is: 4.16.1-1-g341fcf99 (2019-01-27, branch "gaps")

It also seems to be limiting the framerate of my games to 60FPS.

# i3 config file (v4)
#
# Please see https://i3wm.org/docs/userguide.html for a complete reference!
#
# This config file uses keycodes (bindsym) and was written for the QWERTY
# layout.
#
# To get a config file with the same key positions, but for your current
# layout, use the i3-config-wizard
#

# Font for window titles. Will also be used by the bar unless a different font
# is used in the bar {} block below.
font pango:monospace 8

# This font is widely installed, provides lots of unicode glyphs, right-to-left
# text rendering and scalability on retina/hidpi displays (thanks to pango).
#font pango:DejaVu Sans Mono 8

# Before i3 v4.8, we used to recommend this one as the default:
# font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
# The font above is very space-efficient, that is, it looks good, sharp and
# clear in small sizes. However, its unicode glyph coverage is limited, the old
# X core fonts rendering does not support right-to-left and this being a bitmap
# font, it doesn't scale on retina/hidpi displays.

# use these keys for focus, movement, and resize directions when reaching for
# the arrows is not convenient
set $up l
set $down k
set $left j
set $right semicolon

# use Mouse+Mod1 to drag floating windows to their wanted position
floating_modifier Mod1

# start a terminal
bindsym Mod1+Return exec i3-sensible-terminal

# kill focused window
bindsym Mod1+Shift+q kill

# start dmenu (a program launcher)
bindsym Mod1+d exec dmenu_run
# There also is the (new) i3-dmenu-desktop which only displays applications
# shipping a .desktop file. It is a wrapper around dmenu, so you need that
# installed.
# bindsym Mod1+d exec --no-startup-id i3-dmenu-desktop

# change focus
bindsym Mod1+$left focus left
bindsym Mod1+$down focus down
bindsym Mod1+$up focus up
bindsym Mod1+$right focus right

# alternatively, you can use the cursor keys:
bindsym Mod1+Left focus left
bindsym Mod1+Down focus down
bindsym Mod1+Up focus up
bindsym Mod1+Right focus right

# move focused window
bindsym Mod1+Shift+$left move left
bindsym Mod1+Shift+$down move down
bindsym Mod1+Shift+$up move up
bindsym Mod1+Shift+$right move right

# alternatively, you can use the cursor keys:
bindsym Mod1+Shift+Left move left
bindsym Mod1+Shift+Down move down
bindsym Mod1+Shift+Up move up
bindsym Mod1+Shift+Right move right

# split in horizontal orientation
bindsym Mod1+h split h

# split in vertical orientation
bindsym Mod1+v split v

# enter fullscreen mode for the focused container
bindsym Mod1+f fullscreen toggle

# change container layout (stacked, tabbed, toggle split)
bindsym Mod1+s layout stacking
bindsym Mod1+w layout tabbed
bindsym Mod1+e layout toggle split

# toggle tiling / floating
bindsym Mod1+Shift+space floating toggle

# change focus between tiling / floating windows
bindsym Mod1+space focus mode_toggle

# focus the parent container
bindsym Mod1+a focus parent

# focus the child container
#bindsym Mod1+d focus child

# move the currently focused window to the scratchpad
bindsym Mod1+Shift+minus move scratchpad

# Show the next scratchpad window or hide the focused scratchpad window.
# If there are multiple scratchpad windows, this command cycles through them.
bindsym Mod1+minus scratchpad show

# Define names for default workspaces for which we configure key bindings later on.
# We use variables to avoid repeating the names in multiple places.
set $ws1 "1"
set $ws2 "2"
set $ws3 "3"
set $ws4 "4"
set $ws5 "5"
set $ws6 "6"
set $ws7 "7"
set $ws8 "8"
set $ws9 "9"
set $ws10 "10"


# switch to workspace
bindsym Mod1+1 workspace $ws1
bindsym Mod1+2 workspace $ws2
bindsym Mod1+3 workspace $ws3
bindsym Mod1+4 workspace $ws4
bindsym Mod1+5 workspace $ws5
bindsym Mod1+6 workspace $ws6
bindsym Mod1+7 workspace $ws7
bindsym Mod1+8 workspace $ws8
bindsym Mod1+9 workspace $ws9
bindsym Mod1+0 workspace $ws10

# move focused container to workspace
bindsym Mod1+Shift+1 move container to workspace $ws1
bindsym Mod1+Shift+2 move container to workspace $ws2
bindsym Mod1+Shift+3 move container to workspace $ws3
bindsym Mod1+Shift+4 move container to workspace $ws4
bindsym Mod1+Shift+5 move container to workspace $ws5
bindsym Mod1+Shift+6 move container to workspace $ws6
bindsym Mod1+Shift+7 move container to workspace $ws7
bindsym Mod1+Shift+8 move container to workspace $ws8
bindsym Mod1+Shift+9 move container to workspace $ws9
bindsym Mod1+Shift+0 move container to workspace $ws10

# reload the configuration file
bindsym Mod1+Shift+c reload
# restart i3 inplace (preserves your layout/session, can be used to upgrade i3)
bindsym Mod1+Shift+r restart
# exit i3 (logs you out of your X session)
bindsym Mod1+Shift+e exec "i3-nagbar -t warning -m 'You pressed the exit shortcut. Do you really want to exit i3? This will end your X session.' -B 'Yes, exit i3' 'i3-msg exit'"

# resize window (you can also use the mouse for that)
mode "resize" {
# These bindings trigger as soon as you enter the resize mode

# Pressing left will shrink the window’s width.
# Pressing right will grow the window’s width.
# Pressing up will shrink the window’s height.
# Pressing down will grow the window’s height.
bindsym $left resize shrink width 10 px or 10 ppt
bindsym $down resize grow height 10 px or 10 ppt
bindsym $up resize shrink height 10 px or 10 ppt
bindsym $right resize grow width 10 px or 10 ppt

# same bindings, but for the arrow keys
bindsym Left resize shrink width 10 px or 10 ppt
bindsym Down resize grow height 10 px or 10 ppt
bindsym Up resize shrink height 10 px or 10 ppt
bindsym Right resize grow width 10 px or 10 ppt

# back to normal: Enter or Escape or Mod1+r
bindsym Return mode "default"
bindsym Escape mode "default"
bindsym Mod1+r mode "default"
}

bindsym Mod1+r mode "resize"

# Start i3bar to display a workspace bar (plus the system information i3status
# finds out, if available)
bar {
status_command i3status
}

#######################################################################
# automatically start i3-config-wizard to offer the user to create a
# keysym-based config which used their favorite modifier (alt or windows)
#
# i3-config-wizard will not launch if there already is a config file
# in ~/.i3/config.
#
# Please remove the following exec line:
#######################################################################
exec i3-config-wizard

I've tried changing it with xrandr and am not having any luck:

james@battlestation:~$ xrandr
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
DVI-D-0 disconnected primary (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
HDMI-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 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
   2560x1440     59.95*+ 160.00   144.00   120.00    99.95    84.98    23.97  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
DP-3 disconnected (normal left inverted right x axis y axis)
  2560x1440_144.00 (0x1f1) 808.750MHz -HSync +VSync
        h: width  2560 start 2792 end 3072 total 3584 skew    0 clock 225.66KHz
        v: height 1440 start 1443 end 1448 total 1568           clock 143.91Hz
james@battlestation:~$ cvt 2560 1440 144
# 2560x1440 143.91 Hz (CVT) hsync: 225.66 kHz; pclk: 808.75 MHz
Modeline "2560x1440_144.00"  808.75  2560 2792 3072 3584  1440 1443 1448 1568 -hsync +vsync
james@battlestation:~$ xrandr --newmode "2560x1440_144.00"  808.75  2560 2792 3072 3584  1440 1443 1448 1568 -hsync +vsync
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  16 (RRCreateMode)
  Serial number of failed request:  41
  Current serial number in output stream:  41

My monitor is the ASUS ROG PG279 definitely supports 1440p at up to 165fps.

  • How are you so sure it is i3 that is holding down your frame rate? Have you disable vsync on your monitor? KDE uses a config file inside ~/.local/share/kscreen/ that pretty much overides Xorg.conf configurations. Be sure you have disabled vsync inside your xorg config file. You could test vsync as explained here disabling it temporarily - stackoverflow.com/a/29329265/2231796 - __GL_SYNC_TO_VBLANK=0 software_you_wanna_run – user34720 Apr 4 at 17:27

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