Replies: 12 comments 16 replies
-
|
You need to enable flexible scaling. https://github.com/waydabber/BetterDisplay/wiki/Fully-scalable-HiDPI-desktop Just testing the entry level m4 mini, had no trouble going up to 3840x2160p HiDPI with it and all the interim resolutions. Everything should work fine. I am super impressed with the m4 mini (I am testing the entry level one), it is such a great value for money. The app seems to have zero issues with it so far luckily. :) |
Beta Was this translation helpful? Give feedback.
-
|
But just did some more tests with various displays. Interestingly when connecting via USB-C, there is still a 3072px HiDPI horizontal limit in the resolution list (even though the reported limit is 3840px and over HDMI it works). Strange. Maybe this is why you can't get higher resolutions. UPDATE: others reported different (higher) limits over USB-C so there might be some other factors. |
Beta Was this translation helpful? Give feedback.
-
|
@waydabber 
|
Beta Was this translation helpful? Give feedback.
-
|
PS: when I switch to the other Hz rates the resolution options stay the same |
Beta Was this translation helpful? Give feedback.
-
|
Not exactly sure what goes on to be honest and why is the limitation. Now as I am testing it, it indeed behaves rather strangely for me as well - the available resolutions seem to depend on what displays I connect and in what order. Maybe things will be more stable in 15.2. |
Beta Was this translation helpful? Give feedback.
-
|
Update: The usb-c thunderbolt to displayport cable has resolved this issue. I can now use the 3008x1254 resolution (80%) width HiDPI. Absolutely happy now :-) |
Beta Was this translation helpful? Give feedback.
-
|
PS: the former used HDMI was just 2.0, even though it worked with older mac versions it was an issue with sequoia |
Beta Was this translation helpful? Give feedback.
-
|
Generally it seems like since the M4 mini has a somewhat awkward external display support (1x8K+1x5K or 2x6K+1x5K for the M4 mini and 1x8K+1x6K or 3x6K for the M4 pro mini) the system must prioritize a limited-sized framebuffer unless a 8K framebuffer is not absolutely necessary (that is, when a 8K display or a 5K+ ultrawide is connected). Otherwise if the system would simply grants 8K to the first display connected (although it does not seem to be absolutely necessary, like for a 4K display), one less display could be connected later on. Similar limitations existed (but not in such a pronounced manner) for some other Apple Silicon Macs as well. |
Beta Was this translation helpful? Give feedback.
-
|
Dell U4021qw monitor here, 40 inches 5K2K resolution, M4 base Mac mini. Tested it over Thunderbolt and DisplayPort 8K adapter over USB-C, and it seems the limit of 6K is still there :(
@waydabber Is there something we can do or using virtual displays is the only option? Thank you very much for your testing and help! |
Beta Was this translation helpful? Give feedback.
-
|
Strange. Some reported success with a 5Kx2K display on the M4 here: https://forums.macrumors.com/threads/5k2k-at-120hz-with-mac-mini-m4.2441289/unread. I tried to explain in the forums why I think the limitation kicks off (if the OS grants a 8K framebuffer for a display, one less further display can be connected as the entry level Mini supports 2 displays if one is 8K, otherwise it supports 3 displays). But technically the M4 mini should be able to handle a 8K framebuffer (so 3840px HiDPI) which means there is some hope that Apple will tweak this. |
Beta Was this translation helpful? Give feedback.
-
|
Is there anyway to force 8K framebuffer using BetterDisplay to test of it works with this monitor? In the meantime, are there any technical differences between using flexible scaling and virtual displays I should take into account? Thank you @waydabber ! |
Beta Was this translation helpful? Give feedback.
-
|
Mirrored virtual screens work fine for most of the time, but some users report sleep issues or mouse cursor issues depending on setup. There should not be performance issues. Also, virtual screens are limited to 60Hz (although you can add custom 120Hz, I don't think it works, despite some users reporting so). Some ultrawide users at MacRumors forum that 5k2k enables 8K HiDPI (much like 8K displays - which I can test). Is this not the case? |
Beta Was this translation helpful? Give feedback.
-
|
No, it is not my case. Reading the MacRumors thread you mentioned, they are speaking about U4025qw, which is 120Hz monitor. More bandwidth is needed for it? Mine is u4021qw, which is 60Hz only. |
Beta Was this translation helpful? Give feedback.
-
|
It looks like I am not alone (https://forums.macrumors.com/threads/5k2k-at-120hz-with-mac-mini-m4.2441289/post-33564197) even M4 Max can’t achieve 4K HiDPI with this monitor, which works perfect with my MBP M3 Max… Something weird happens with these M4 processors… |
Beta Was this translation helpful? Give feedback.
-
|
@waydabber do you have a chance to test on a basic M4, connect two 4K monitors, each has a framebuffer for hidpi will be 3840px or is that not true? |
Beta Was this translation helpful? Give feedback.
-
|
I did not try that. Did someone report that this is what happens? |
Beta Was this translation helpful? Give feedback.
-
|
I'm having what seems to be a related issue with my new M4 Pro MacBook Pro. I have an 40WP95C-W (LG 5k2k) monitor. On my M1 Pro MBP, it works fine at a HiDPI resolution of 3840x1620. (Natively, BetterDisplay not required.) But when I connect my new computer, the highest I can go without getting all the way up to the native resolution is 3360x1418: 
Enabling flexible scaling in BetterDisplay doesn't seem to help; it still shows as the max scaled resolution: 
Connecting to the display over HDMI is worse, though that might just be my cables. I did also try adjusting the refresh rate down from the native 72 Hz to 60 Hz, but that didn't help either. |
Beta Was this translation helpful? Give feedback.
-
|
It's interesting how some seem to be able to achive 3840px on a 5K2K display (https://forums.macrumors.com/threads/5k2k-at-120hz-with-mac-mini-m4.2441289/unread), some 3360px and while others only 3072px. |
Beta Was this translation helpful? Give feedback.
-
|
I don't think this is just a Mac Mini Problem. |
Beta Was this translation helpful? Give feedback.
-
|
no it's not. Same problem on Mac Mini M4, and MBP M4 Pro. MBP M1 Pro does not have this problem. |
Beta Was this translation helpful? Give feedback.
-
|
Correct, my M2 Pro does not have this issue. This is really annoying. The Virtual Display works but I don't think it's perfect, seems to act up here and there. The system I am having the issue on is an M4 Max. |
Beta Was this translation helpful? Give feedback.
-
|
Hi, same problem here, LG 38WN95C-W monitor with 3840x1600 was working fine (and still is) on my previous M1 Pro 16in, and on my new M4 Pro 16in I can't enable that native resolution with hidpi active as well. Max it will go to is 3360x1400 with hidpi. Refresh rate changes don't impact anything. Should be noted that my BetterDisplay settings are identical between the 2 laptops. 
|
Beta Was this translation helpful? Give feedback.
-
|
Same display, same behaviour |
Beta Was this translation helpful? Give feedback.
-
|
I don’t think there’s anything that we can do on our own. This almost certainly seems like a bug with Apple’s M4 drivers. I’ve been engaging with them via a support case, and I encourage everyone else to do the same so they understand how many people are affected. |
Beta Was this translation helpful? Give feedback.
-
|
It may also be helpful to additionally file a feedback assistant case at https://feedbackassistant.apple.com/. You can link the case I filed already: FB15785684 |
Beta Was this translation helpful? Give feedback.
-
|
Thanks, I've submitted a ticket today as well. They are off for Christmas and holidays but are saying they should be back to processing tickets by Jan 2nd. |
Beta Was this translation helpful? Give feedback.
-
|
Same issue here, m4 pro with the LG 40WP95C. Submitted ticket |
Beta Was this translation helpful? Give feedback.
-
Hi @waydabber,
I have the LG 38GN950 (3840x1600) screen. I usually use this with the resolution 3200x1333 @ HiDPI mode with my macbook pro (M2 Pro @ Sonoma).
Since today I also have a mac mini (m4 base model) and I am unable to get this resolution working on it :-(.
The highest HiDPI it offers me is 2560x1067, which scales the UI elements too large for me.
Does anyone have any idea how I could get 3200x1333 to work in HiDPI mode on this setup?
PS: I use the display via HDMI and at 75hz. The only alternative refresh rate that is offered is 30hz. I was able to use the 3200x1333@75hz HiDPI with the same cable on the m2 pro macbook pro.
PPS: I have order a DP1.4 8k 60hz, 4k 240hz usb-c to displayport cable, which should arrive tomorrow to try if that makes any difference.
Thanks a lot,
Chris
Beta Was this translation helpful? Give feedback.
All reactions