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I am running 14.10 on Lenovo Yoga 12 with 280x160mm panel with 1920x1080
resolution, which translates to 174x171 DPI by trivial calculation. The
panel size is correctly reported by edid:

$ get-edid | parse-edid
This is read-edid version 3.0.2. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 1
No EDID on bus 2
No EDID on bus 3
No EDID on bus 5
1 potential busses found: 4
256-byte EDID successfully retrieved from i2c bus 4
Looks like i2c was successful. Have a good day.
Checksum Correct

Section "Monitor"
	Identifier "
"
	ModelName "
"
	VendorName "LGD"
	# Monitor Manufactured week 0 of 2013
	# EDID version 1.4
	# Digital Display
	DisplaySize 280 160
	Gamma 2.20
	Option "DPMS" "false"
	Modeline 	"Mode 0" 138.46 1920 1968 2000 2106 1080 1083 1088 1095 +hsync -vsync 
EndSection

The XServer thinks something different:

$ xdpyinfo | grep -B2 resolution
screen #0:
  dimensions:    1920x1080 pixels (508x285 millimeters)
  resolution:    96x96 dots per inch

where the physical size is garbage. The driver sets DPI to 96 despite
having correct data, and there seems to be no straightforward way to
force a different DPI (see e.g. [1]). The internet is full of various
workarounds for HiDPI displays, which include setting text-scaling-
factor in dconf (gnome-only) , layout.css.devPixelsPerPt (mozilla
products), scaling-factor (integer values only?), all of the toolkit- or
program-specific. They have all of them some gotchas (such as terribly-
looking interface, different scaling of some text, ugly icons etc).

I am willing to help debugging the driver, since Ubuntu should have a
way to behave well out-of-box on HiDPI configurations. If the driver
reports the right DPI, I assume many of those issue would disappear.

[1] https://ask.fedoraproject.org/en/question/39272/how-to-configure-
screen-dpi-ppi-properly/

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
BootLog:
 [  OK  ] Started Modem Manager.
 [  OK  ] Started Detect the available GPUs and deal with any system changes.
          Starting Light Display Manager...
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: Tue Nov  3 08:54:40 2015
DistUpgraded: Fresh install
DistroCodename: wily
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:503e]
InstallationDate: Installed on 2015-08-31 (63 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20DLCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=f5cdca16-e2f9-4b9e-b12c-65011c787ea7 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/05/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: JEET66WW (1.15 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20DLCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0K11826 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrJEET66WW(1.15):bd06/05/2015:svnLENOVO:pn20DLCTO1WW:pvrThinkPadS1Yoga12:rvnLENOVO:rn20DLCTO1WW:rvrSDK0K11826WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20DLCTO1WW
dmi.product.version: ThinkPad S1 Yoga 12
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Mon Nov  2 08:12:10 2015
xserver.configfile: default
xserver.errors:
 Wacom ISDv4 EC Pen stylus: Invalid type 'cursor' for this device.
 Wacom ISDv4 EC Pen stylus: Invalid type 'touch' for this device.
 Wacom ISDv4 EC Pen stylus: Invalid type 'pad' for this device.
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                1079 
 vendor                                     LGD
xserver.version: 2:1.17.2-1ubuntu9

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu wily
-- 
Display size incorreectly detected (assuming 96x96 DPI)
https://bugs.launchpad.net/bugs/1512606
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