Windows 10: Different DPI on different monitors leads fuzzy apps

I have a laptop equips with a screen with resolution of 2880x1800 and I set the DPI scaling to 150% which equivalents to a 1920x1200 monitor. I also connect an external monitor with resolution of 1920x1080 and the DPI scaling is set to 100%. The display on the internal monitor is clean and clear for all applications. However, some apps, inlcuding build-in apps, such as task manager and third party apps, like Matlab, become fuzzy when it is dragged to the external monitors. A futher testing suggested that there will be no fuzzy rendering only if the same DPI scaling is applied to all monitors,

:)

 

Dual monitors with different DPI settings do not give correct scaling

An issue with DPI scaling arises when using two different scaling factors. The screen with the lower DPI display is fuzzy/blurred (most easily seen in text).

Hardware and settings

These are the hardware and settings involved:

• 1x primary 3840x2160 27" monitor with DPI scaling set to 150% (because regular text is unreadable at 27").
• 1x secondary 1920x1080 24" monitor with DPI scaling set to 100%, displaying blurry text and images at these settings.

Workarounds

When I use the same DPI scaling on both monitors the display shows correctly. This gives two undesirable workarounds:

• Setting 100% DPI scale on the UHD screen fixes display, but makes text unreadably small on this monitor.
• Setting 150% DPI scale on the HD screen fixes display, but makes text so large I barely have any screen space left on this monitor.

Is there per chance a better solution to this problem? Is this a Windows bug or am I using DPI scaling in the wrong way?

EDIT: Here's the system info from dxdiag just in case.

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System Information

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Time of this report: 11/14/2015, 13:09:59

Machine name: -

Operating System: Windows 10 Pro 64-bit (10.0, Build 10240) (10240.th1_st1.151104-1714)

Language: Dutch (Regional Setting: Dutch)

System Manufacturer: To Be Filled By O.E.M.

System Model: To Be Filled By O.E.M.

BIOS: BIOS Date: 07/09/14 21:30:44 Ver: 04.06.05

Processor: Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz (8 CPUs), ~3.5GHz

Memory: 8192MB RAM

Available OS Memory: 8112MB RAM

Page File: 5936MB used, 3454MB available

Windows Dir: C:\WINDOWS

DirectX Version: 12

DX Setup Parameters: Not found

User DPI Setting: Using System DPI

System DPI Setting: 144 DPI (150 percent)

DWM DPI Scaling: Enabled

Miracast: Available, with HDCP

Microsoft Graphics Hybrid: Not Supported

DxDiag Version: 10.00.10240.16384 64bit Unicode

 

Fuzzy/Blurry letters on external display (DPI scaling issue?)

Hello -

Relevant data

• Microsoft Surface Book - i5 - 256 GB with NVIDIA GeForce GT 940M
• LG 34UM58-P - Ultrawide IPS Monitor (Also tried on an acer HD monitor)
• High quality mini display to HDMI cable
• Windows 10 Pro 1709
• Surface Book just freshly set up

Description

• In essence, all text (not only in browsers, but also in generic windows menus, see images below) are slightly fuzzy - while being tack sharp on the Surface Book display.
• Based on my search on this forum and the wider web, this is a known issue, but none of the solutions or workaround suggested have worked for me. ( Been spending a full day and a half on researching this and I think I tried them all)

Display settings Settings

• On Surface Book: Dropbox - File Deleted - Simplify your life
• On LG ultrawide: Dropbox - File Deleted - Simplify your life

Illustrative images/screenshots

• Fuzzy text on windows start menu on external monitor:Dropbox - File Deleted - Simplify your life
• Fuzzy text on the menu of this forum on external monitor:Dropbox - File Deleted - Simplify your life
• For reference the same menu on the display of Surface Book:Dropbox - File Deleted - Simplify your life

I believe this is a known bug in Windows 10, where it can not correctly handle 2 monitors with different DPI scaling. The posts on this forum suggest that the latest versions of Windows should have fixed this issue, but for me this is not the case - as I
am indeed running the latest version of Windows 10

(I also posted this in the Surface forum, but since this appears to be a Windows issue and not a Surface one, I thought I would try my luck here. Apologies for the cross post.)

Any advise greatly appreciated.

 

Adjusting multiple monitor positions when DPI is different

Windows 11 assumes all monitors have the same DPI, so if I try to line up a 1600x1200 monitor with a 1920x1080 monitor side by side, but the 1080 one is physically larger, things don't match up when I move the mouse cursor across. Is there any way to tell Windows the DPI is different? I can foresee this could be impossible since, although the mouse could jump pixels easily, what would a window stretched between them do?