Enabling HiDPI mode on an ultrawide monitor with an M4 Mac can be challenging due to compatibility issues reported by many users. Here's a detailed guide on how to address this problem:
Understanding the Issue
M4 Macs seem to have a problem supporting HiDPI mode with ultrawide monitors, particularly those with a 5K2K resolution (5120 x 2160). This issue results in blurry text and interfaces, unlike older Macs where these monitors work seamlessly[1][3][5].Workarounds
Using BetterDisplay
One effective workaround is using BetterDisplay, a utility that allows you to scale your display and enable HiDPI modes. Hereâs how to use it:1. Download and Install BetterDisplay: You can find it online and install it by dragging it to your Applications folder.
2. Configure BetterDisplay:
- Open BetterDisplay from the Menu Bar.
- Select Settings from the gear icon.
- Go to the Displays section and check the box to enable scaling.
- Adjust the scaling as needed to achieve a HiDPI-like effect[6][9].
However, using BetterDisplay might reduce the refresh rate from 75Hz to 60Hz[1][7].
Alternative Tools
Other tools like SwitchResX and displayplacer can also be used to manage display settings, but they might not directly enable HiDPI mode on non-native resolutions. SwitchResX allows you to create custom resolutions, which can help in achieving a sharper display, but it requires manual configuration[2][4].Additional Tips
- Cable and Connection: Some users have reported success by changing the connection method, such as switching from DisplayPort to USB-C[7].- Monitor Compatibility: Not all 5K2K monitors are affected equally, so it might be worth trying a different monitor if possible[9].
Conclusion
While there isn't a straightforward way to enable HiDPI mode on ultrawide monitors with M4 Macs without third-party tools, using BetterDisplay is currently the most effective workaround. However, it's important to monitor for any updates from Apple that might address this compatibility issue in the future.Citations:
[1] https://mjtsai.com/blog/2025/01/03/m4-mac-issues-with-ultrawide-monitors/
[2] https://apple.stackexchange.com/questions/54481/enable-all-hidpi-modes
[3] https://talk.tidbits.com/t/m4-mac-problems-with-5k-ultrawide-displays/29912
[4] https://www.reddit.com/r/MacOS/comments/sqwsh5/how_to_enable_hidpi_on_external_monitor/
[5] https://www.powerpage.org/some-users-complain-of-compatibility-issues-between-m4-macs-and-5k2k-ultrawide-displays/
[6] https://machow2.com/external-display-problems/
[7] https://9to5mac.com/2024/12/30/m4-mac-ultrawide-monitor/
[8] https://discussions.apple.com/thread/255326424
[9] https://www.reddit.com/r/apple/comments/1hqgo9q/m4_mac_users_complain_about_compatibility_issues/