Public bug reported:

On a hidpi display, the unity8 desktop session in 16.10 has an oversized
and inconsistent UI scale. The unity8 session is absolutely not usable
for testing (because there is not even enough screen space to display
the logout menu item).

The shell+cursor is rendered with a UI scale of at least 2× the correct scale 
(e.g. 4× the scale of a low-dpi display). Due to this the indicator menus 
collapse immediately after clicking because they are larger than the screen 
height.
The content of the scopes window is rendered with 4× the correct scale, giving 
space for only one icon.

In unity 16.04, the correct scale could be achieved by setting "export
GRID_UNIT_PX=16" in .bashrc, however this has no effect anymore when I
remove or change it. The issue is also in the guest session.


Ubuntu version: 16.10 (fresh install)

unity8 version: 8.14+16.10.20160 amd64

physical resolution: 3200×1800

resolution used by unity8: 3200×1800 (at first sight I thought it
selected a low resolution, but in fact fonts are very sharp).

** Affects: unity8 (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "photo showing the shell 2× too big and the scopes 4× too 
big"
   
https://bugs.launchpad.net/bugs/1642272/+attachment/4778139/+files/IMG_20161116_141005.jpg

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https://bugs.launchpad.net/bugs/1642272

Title:
  incorrect UI scale on high-resolution desktop

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