However, since yesterday I am running into this weird issue where towards the afternoon my external monitor will start to flicker a lot. I've checked all the optional sleep options. Now, this setup has been stable, even through sleep. I use a Dummy which I then mirror to my external screen and use the internal monitor as an extended screen. I have an M1 Macbook air and one external monitor. So my setup has been working well for a while. If you want to donate or buy me a lunch, please let me know! :) The basic idea and some of the code was adapted from FluffyDisplay. If you like this app, you'll like MonitorControl even more! Control the brightness, volume of your external display like it would be a native Apple display! Special Thanks Change signing settings to suit your configurationĪn unsigned beta release is also provided.The app and instructions were tested on an M1 MBA and mini running Monterey but according to reports works on Big Sur as well. The app saves the dummy display configuratio and automatically restore it upon next restart. You might have to fight with the Displays tab in Preferences sometimes as (at least on Monterey) the Optimize for setting tends to reset at random times to the physical display for unknown reasons while changing the settings (the Displays tab appears to be rather buggy in general).HiDPI resolutions are followed by non-HiDPI resolutions so don't forget to scroll down, it's a long list!.You'll see a long list of available resolutions - select the desired resolution.In the app menu choose Connect Dummy and select your desired aspect ratio.Does not utilize graphics hardware in vain so it is somewhat faster.Works with all aspect ratios, does not depend on what resoluations are recorded in the dummy's EDID/firmware.Offers a much wideer variety of HiDPI and standard resolutions.Does not suffer from issues that prevalent with the physical dummy route (like jittery mouse cursor).Your HDMI port will remain usable for an other display.To alleviate this problem, DummyDisplay creates a virtual dummy display for you which you can then utilize as a mirror main.Īdvantages of BetterDummy over a physical 4K HDMI dummy plug: This approach has obvious drawbacks (you need to buy a dummy, you render your HDMI port useless etc.) To fix this issue, many resort to buying a 4K HDMI dummy dongle to fool macOS into thinking that a 4K display is connected and then mirror the contents of this dummy display to the physical lower-res display in order to have HDMI resolution. Notoriously they don't allow sub 4K resolution displays to have HiDPI ("Retina") resolutions even though a 22" - 24" QHD display would greatly benefit from having an 1920x1080 HiDPI mode. M1 macs tend to have issues with custom resolutions. screenresolution Command line utility for getting, setting and listing display resolution on Mac OS X 10.Dummy Display for Apple Silicon Macs to achieve custom resolutions. I have an odd behavior on my home system that I was hoping someone could explain or at least provide more puzzle pieces to. The free app BetterDummy resolves the resolution issues on M1 Apple Silicon, with one major drawback: You lose HDR support Thankfully its easy to toggle BetterDummy as needed, but thats the current situation. I have a 1440p thunderbolt monitor (Lenovo p27h-10) and a 4k DP monitor. Its due to a limitation behind the scenes with the macOS Quartz virtual display mirroring. Launch the Terminal app on your Mac from the /Applications/Utilities folder. I run it at 3200x1800.Įvery manual and tool reports the Lenovo p27h-10 as a 1440p display. Unlock your displays on your Mac Smooth scaling, HiDPI unlock, XDR/HDR extra brightness upscale, DDC, brightness and dimming, dummy displays, PIP and lots. But when I use this third-party "Display Menu" app to ask for mirrored displays, the Lenovo P27-h10 runs at 3360x1890. Even though even this app, even while mirroring and the resoluton being listed at 3360x1890 in the tool, the tool doesn't show this resolution in the dropdown as it normally does the "select" res along with other options. If the Lenovo is the primary display, putting it into mirroring from the third-party app results in both displays at 1440p When comparing BetterDummy and deskreen you can also consider the following projects: one-key-hidpi - Enable macOS HiDPI and have a native setting.Doing the same mirroring through Settings puts both displays into 1440p.Text looks fine when it's surprisingly 3360x1890.Other than just being surprising, I am interested in what's going on here because it would be nice to run this thing at 3360x1890 when not mirroring, even if it turns out to be at 30hz. My tentative conclusion as a layman in this stuff is that this mode is somehow supported by the display but not advertised (in EDID?), and some bug in this Display Menu app causes it to try to switch to a mode that it shouldn't try.
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