Public bug reported:

scaling changes when closing/re-opening the lid. Seen in bionic.

Mz scaling is set to 100%, but the laptop is considered highdpi by
mutter, and during suspend/resume it changes back to default ignoring
settings.

$ xprop -spy -root RESOURCE_MANAGER
[...]
RESOURCE_MANAGER(STRING) = 
"*customization:\t-color\nXft.dpi:\t192\nXft.antialias:\t1\nXft.hinting:\t1\nXft.hintstyle:\thintslight\nXft.rgba:\trgb\nXcursor.size:\t48\nXcursor.theme:\tDMZ-White\n"
RESOURCE_MANAGER(STRING) = 
"*customization:\t-color\nXft.dpi:\t96\nXft.antialias:\t1\nXft.hinting:\t1\nXft.hintstyle:\thintslight\nXft.rgba:\trgb\nXcursor.size:\t24\nXcursor.theme:\tDMZ-White\n"

xrandr
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192
eDP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y 
axis) 309mm x 174mm
   2560x1440     60.00*+  59.99    59.99    59.96    59.95

** Affects: mutter (Ubuntu)
     Importance: Medium
     Assignee: Marco Trevisan (TreviƱo) (3v1n0)
         Status: Triaged

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https://bugs.launchpad.net/bugs/1793496

Title:
  scaling changes when closing/re-opening the lid

Status in mutter package in Ubuntu:
  Triaged

Bug description:
  scaling changes when closing/re-opening the lid. Seen in bionic.

  Mz scaling is set to 100%, but the laptop is considered highdpi by
  mutter, and during suspend/resume it changes back to default ignoring
  settings.

  $ xprop -spy -root RESOURCE_MANAGER
  [...]
  RESOURCE_MANAGER(STRING) = 
"*customization:\t-color\nXft.dpi:\t192\nXft.antialias:\t1\nXft.hinting:\t1\nXft.hintstyle:\thintslight\nXft.rgba:\trgb\nXcursor.size:\t48\nXcursor.theme:\tDMZ-White\n"
  RESOURCE_MANAGER(STRING) = 
"*customization:\t-color\nXft.dpi:\t96\nXft.antialias:\t1\nXft.hinting:\t1\nXft.hintstyle:\thintslight\nXft.rgba:\trgb\nXcursor.size:\t24\nXcursor.theme:\tDMZ-White\n"

  xrandr
  Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192
  eDP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y 
axis) 309mm x 174mm
     2560x1440     60.00*+  59.99    59.99    59.96    59.95

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