Thanks for the info!  However, let me recall that the bug is not against unity 
and gnome, but xorg. For many reasons one may have X starting without unity or 
gnome (because of using another desktop or a transient misconfiguration). In 
this case, X should be able to provide readable chars even if one is on a 
hi-dpi monitor. X setting the DPI at 96 prevents this. Please, even if gnome 
and unity fix the HiDPI issue, let still have a configuration option for X 
allowing one to switch between:
1) Ignore the EDID and fix the dpi to 96 (current behavior, good for older 
hardware)
2) Respect the EDID info about dpi (good for newer hardware, but risky for 
projectors and TVs)
3) Respect the EDID info, with same safety checks (e.g. force some default if 
EDID data looks too small or too large to be credible)

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https://bugs.launchpad.net/bugs/589485

Title:
  Ignores physical display size and calculates based on 96DPI

Status in X.Org X server:
  Confirmed
Status in “xorg-server” package in Ubuntu:
  Confirmed

Bug description:
  The X server, starting with 1.7, ignores the physical size reported by
  the EDID or in xorg.conf and calculates it based on screen resolution
  and a DPI of 96.

  This is rather annoying for users of high DPI screens.

  GNOME and KDE (used?) to set 96 DPI by default in their settings.  We
  should check whether they still do, and if so let them handle this; I
  don't think X should be handling this.

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