GNU bug report logs - #76691
`display-monitor-attributes-list` not working properly on macOS

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From: Ruiyang Wu <ywwry66 <at> gmail.com>
To: Ship Mints <shipmints <at> gmail.com>
Cc: 76691 <at> debbugs.gnu.org
Subject: bug#76691: `display-monitor-attributes-list` not working properly on macOS
Date: Sun, 2 Mar 2025 21:29:23 -0500

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Thanks for the suggestion. I tried both the stable release and the nightly build from the repo you linked, but unfortunately they seem to behave the same way as the official NS port. If you are able to come up with a patch, I would definitely like to test that on the master branch.

Best,
Ruiyang

> On Mar 2, 2025, at 4:12 PM, Ship Mints <shipmints <at> gmail.com> wrote:
> 
> If you try the following Emacs 30.1 NS build and it works for you, I think I know which one-liner patch might need to be applied to make this work.  I don't have more than one monitor so I can't easily test this on my own.  If I submit a patch for this, would you be able to build from master?  I could try to use my iPad as an external monitor, I suppose but not sure if that will work.
> 
> https://github.com/jimeh/emacs-builds/releases/tag/Emacs-30.1
> 
> On Sun, Mar 2, 2025 at 4:00 PM Ruiyang Wu <ywwry66 <at> gmail.com <mailto:ywwry66 <at> gmail.com>> wrote:
>> Hi,
>> 
>> I am using the official NS port Emacs 30.1 on a MacBook (macOS Sequoia) with an external monitor. The output of `display-monitor-attributes-list` is as follows:
>>> (((geometry 0 0 1512 982) (workarea 0 38 1512 944) (mm-size 301 195) (frames) (source . "NS")) ((geometry 1512 -517 1600 900 (workarea 1512 -517 1600 875) (mm-size 549 311) (frames #<frame scratch* 0x12d08e430>) (source . "NS")))
>> It fails to recognize my monitors. Furthermore, when I run `M-x make-frame-on-monitor`, no candidate is provided.
>> 
>> 
>> However, if I use `emacs-mac` from https://bitbucket.org/mituharu/emacs-mac/src/master/, the monitors can be correctly recognized. `display-monitor-attributes-list` prints
>>> (((geometry 0 0 1512 982) (workarea 0 38 1512 944) (mm-size 301 196) (frames) (name . "Built-in Retina Display") (backing-scale-factor . 2)) ((geometry 1512 -517 1600 900) (workarea 1512 -492 1600 875) (mm-size 549 311) (frames #<frame *scratch* - GNU Emacs at Ruiyangs-MBP 0x1400a62c8>) (name . "DELL U2515H") (backing-scale-factor . 2)))
>> And I can also use `make-frame-on-monitor` to create new frames without issue.
>> 
>> 
>> Is it possible to have the aforementioned behavior from `emacs-mac` in the official NS port? That would greatly improve my workflow. Thank you very much!
>> 
>> Best,
>> Ruiyang
>> 

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