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[Launchpad Bug Tracker <1649736@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity - 7.4.5+16.04.20171201.3

---------------
unity (7.4.5+16.04.20171201.3) xenial; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * InputMonitor: add an unity class that monitors XInput2 events and
    converts them to XEvent
  * EdgeBarrierController: use InputMonitor to get the barrier events
    instead of relying on its implementation
  * DecorationsMenuLayout: use input monitor for menu scrubbing (LP:
    #1614597)
  * PanelView: use InputMonitor to track menu events
  * LockScreenPanel: use InputMonitor events instead of mouse polling
    for menu scrubbing
  * MenuManager: add support for mouse trackers with triangle algorithm
    support (LP: #1618405)
  * PanelView: scale gradient refinement properly
  * PanelService: don't allow to deactivate menus if they've been opened
    too shortly
  * LockScreenController: ignore icon_paths_changed signal in
    menumanager for Lockscreen
  * LockScreenController: use InputMonitor to get all the events and
    hide the Blank Window (LP: #1321075)
  * LockScreenController: use input monitor to get the events to switch
    monitor (LP: #1316862)
  * LauncherOptions: use track_obj to manage option changes (LP:
    #1622995)
  * UnityScreen: toggle gestures recognition on lock (LP: #1645507)
  * GnomeSessionManager: add gcancellable to instance and use it for
    calls with temporary proxies
  * BackgroundSettings: use gnome-bg to generate textures with proper
    scaling (LP: #1666359)
  * UnityWindow: safely check validity of UnityWindow from scaled one
    (LP: #1659847)
  * Panel: ensure the menu-manager tracker is updated to match monitor
    (LP: #1671432)
  * compiz-profile-setter: tool to update the current profile and use in
    systemd and Unity settings (LP: #1668950)
  * BGHash, UnityScreen: get desktop averageColor from compiz
  * Launcher: disable or reduce most icon effects on lowgfx (LP:
    #1700859)
  * PanelController: ensure we disconnect from signals on destruction
    (LP: #1504870)
  * tools: add migration script to set the default values for unity-
    lowgfx profile

  [ Andrea Azzarone ]
  * Properly handle the file manager copy dialog in
    FileManagerLauncherIcon and in StorageLauncherIcon. (LP: #1575452,
    LP: #1609845)
  * Correctly position the force quit dialog when scaling is different
    than 1.0 (LP: #1637991)
  * GnomeSession: Retrieve the session id using dbus if $XDG_SESSION_ID
    is not set
  * Round gtk scaling factor to closest integer. (LP: #1649736)
  * Keep the screen locked if rebooting with autologin. (LP: #1600389)
  * Use g_mkdir_with_parents instead of mkdir.
  * Lockscreen: always draw the background-color in the lockscreen (LP:
    #1702701)
  * Refactor the way UserAuthenticator is created and passed around.
    Handle failures to create new threads and fallback to a "Switch to
    greeter..." button in case of failure. (LP: #1311316)
  * Wait until the color buffer is cleared before suspending. (LP:
    #1532508)

  [ Kai-Heng Feng ]
  * UnitySettings: If scale-factor is not set, find and set right scale
    for HiDPI displays.

  [ Eleni Maria Stea ]
  * shouldn't create blur rectangles when there's no blur, skips the
    blur rects processing in low gfx.
  * removes lowgfx option from ccsm, reads the "lowgfx" gsetting (LP:
    #1668950)

  [ Nick Dedekind ]
  * Fixed tooltip scaling issues. (LP: #1673950)

 -- Marco Trevisan (Treviño) <mail@xxxxxxxxx>  Fri, 01 Dec 2017 18:46:01
+0000

** Changed in: unity (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1649736

Title:
  unity picks poor hidpi scale factor defaults

Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  The recently set-hidpi-scale-factor branch provides extremely valuable support for hidpi displays, but it does introduce a few easily fixed regressions because of the way it anchors scaling too rigidly to simulate 140 DPI.

  This works well on a 15" Full HD or 4K screen, but sets a non-integer
  scale factor on 14" and 17" Full HD or 4K screens.  Most toolkits
  don't support non-integer scaling factors very well, and even if they
  did, it would still result in a loss of sharpness.

  The displays mentioned above are perfectly usable at the nearest
  integer scaling factor, and windows render much more cleanly when set
  to 1x or 2x than 1.125x or 1.875x.  The +-1/8 scale difference in size
  compared to 1x or 2x isn't worth breaking pixel perfect widget
  rendering.  It would be a good idea to try to default to integer
  scaling factors whenever reasonable.  Otherwise most people will have
  mangled widgets unless they spend the time to set the scale factor
  themselves.

  Here's the relevant merge:
  https://code.launchpad.net/~kaihengfeng/unity/set-hidpi-scale-
  factor/+merge/299380

  [Test Case]
  1. Open "System Settings..."
  2. Open Display Panel
  3. Scale monitor to "1.75"
  4. gsettings get org.gnome.desktop.interface scaling-factor
  5. The above commands returns 2

  
  [Potential Regression]
  None

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