Unity wrongly scales font size after display scale >= 2

[Sasa Vilic]

I have HiDPI display and I want to increase size of controls and font. I use Display settings to increase scale for particular monitor. I noticed following strange behaviour:

If scale setting configured in Display settings is less then 2, then font scale is increased accordingly. Once I increase scale to 2, the font scale is reduced back to 1. If I keep increasing display scale, the font scale will also increase proportionally but once I hit scale of 3, the font scale will be back at 1.

So in order to use my HiDPI monitor, I have to keep Display scale at <2 (1.88). I would like to use something like 2+, but it currently not possible.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160906-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
Uname: Linux 4.4.0-66-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
BootLog:
 lvmetad is not active yet, using direct activation during sysinit
 /dev/mapper/ubuntu--vg-root: clean, 687604/14524416 files, 12706845/58089472 blocks
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Mar 27 10:16:43 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation Sky Lake Integrated Graphics [8086:1916] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Skylake Integrated Graphics [103c:81eb]
InstallationDate: Installed on 2017-02-16 (38 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: HP HP 250 G5 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-66-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/19/2016
dmi.bios.vendor: Insyde
dmi.bios.version: F.09
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 81EB
dmi.board.vendor: HP
dmi.board.version: 61.28
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.09:bd05/19/2016:svnHP:pnHP250G5NotebookPC:pvrType1ProductConfigId:rvnHP:rn81EB:rvr61.28:cvnHP:ct10:cvrChassisVersion:
dmi.product.name: HP 250 G5 Notebook PC
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Mar 27 10:04:37 2017
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 1671
 vendor BOE
xserver.version: 2:1.18.4-0ubuntu0.2