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Status Not under consideration
Workspace IBM i
Categories IBM i Access Family
Created by Guest
Created on Aug 31, 2018

Proper Support for High DPI Monitors

High DPI monitors almost always require running Windows 10 Scaling at 125% or higher. Nearly all native applications properly support this scaling. ACS does not. All icons and text become blurry as compared to other applications (because High DPI is not supported).
The workaround is to disable High DPI. While this is OK, this does not apply when starting ACS components by way of file associations (i.e. double-clicking on .hod or .sql files). In these cases, the "disable high DPI" applied to acslaunch-64.exe does not apply.

Use Case:

Windows 10 Professional on Lenovo Thinkpad with attached Dell U2415 (24" LED) monitor. Running at 1900x1200 resolution. Scaling set to 125%.

Idea priority Medium
  • Guest
    Oct 8, 2018

    To enable ACS for a DPI monitor on Windows, ACS must be run with Java 10 or higher. You can check the version of Java being used by ACS by selecting Help->About from the main panel.
    You will also need to enable the ACS acslaunch*.exe for DPI. If you used one of the provided install scripts, it will be at one of the following locations:

    To enable ACS for a DPI monitor:
    1. Using Windows Explorer, navigate to the above acslaunch*.exe path
    2. Right click on acslaunch*.exe and select Properties
    3. Select Compatibility tab
    4. Select "Change High DPI settings" button
    5. Check box - "Use this setting to fix scaling problems for this program instead of the one in Settings"
    6. Under "Use the DPI that's set for my main display when" select "I open this program"
    7. Check box - "Override high DPI scaling behavior"
    8. Under "Scaling performed by:" select "Application"
    9. Select, OK, Apply, OK.

    DPI will now be enabled when you start ACS.
    Note: The default font for 5250 display emulation is the IBM3270 raster font. Raster fonts in general do not scale well. When changing the scaling of your display to 125% or more, if you are not satisfied with the font being used by 5250 display emulation, you may want to consider using a TrueType font. If you find a TrueType font that you like better than the IBM3270 raster font with a display scaled at 125% or higher, please post the font name here and where you downloaded it from.

  • Guest
    Sep 19, 2018

    Just to give more information on JRE v10... This improved the text in the dialog boxes when opening acslaunch.exe. It also improved the icons. However, it made worse: 5250 emulator screen, Run Sql Scripts fonts, etc. (no matter the settings for high DPI)

  • Guest
    Sep 18, 2018

    Installed JRE v10
    (java -version)
    java version "10.0.2" 2018-07-17
    Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
    Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

    Upgrading Java to v10 absolutely made the issue WORSE. The 5250 Screen fonts are horrible no matter how i resize the window. The 5250 screen is completely unusable! I will be forced to remove JRE 10.

    I tried all different High DPI scaling options on this application.

  • Guest
    Sep 17, 2018

    Our investigation indicates the issue with using ACS on Windows with high DPI monitors is resolved when using Java 10. Please upgrade to Java 10 and let us know if that resolves your issue.