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After being up for 15 days, gsd-color, gsd-power and gsd-wacom each have about 10 GiB mapped of which 6.6 GiB is resident.

This is with 3.28.1. If there's more info I can grab from the currently-running processes let me know. Or else if you know how to arrange the system to launch these processes under valgrind I can give that a go.

This may be similar to https://bugzilla.gnome.org/show_bug.cgi?id=768832 and https://bugzilla.gnome.org/show_bug.cgi?id=766135 which were never resolved. I've run strings on gsd-power's core file and the sorted result ends:

  58014 Iiyama North America 24"
  58026     
  59625 q~M@
  60657 auaua{sv})
  60660 DisplayPort
  60662 0x00000000
  60662 0x143b
  60662 Built-in display
  60662 LQ156D1JW05
  60663 eDP-1
  60666 DP-1-2
 116021 q8-@X,E
 116027 1130763144183
 116027 PLE2483H
 118674 edid
 121321 backlight
 121321 connector-type
 121321 display-name
 121321 min-backlight-step
 121321 presentation
 121321 supports-underscanning
 121321 underscanning
 121322 primary
 121322 product
 121323 height-mm
 121323 vendor
 121323 width-mm
 121324 serial
 424620 7`qV
1014782 uaua{sv})

PLE2483H and 1130763144183 appear in my monitor's EDID data (read from /sys/class/drm/card1-DP-2/edid). These strings show up in similar numbers in the other processes' core files.