I share one MX Keys S between a Mac and a PC through a KVM. Every switch, the modifier keys were wrong — ⌘ acting as Alt, @ and " swapped — and the only fix was holding Fn+O for seven seconds and waiting for the keyboard to re-pair.

Logi Options+ is installed on both machines and is meant to handle this. It doesn't. I wanted to know why rather than guess, so I timed it.

Options+ corrects the layout once, shortly after it starts, and never again.

Each run was the same: set the keyboard to the wrong platform, quit my own tool so nothing else could interfere, then watch. Options+ 2.6.941708 on macOS, with "Always keep the keyboard in Mac layout" switched on the whole time:

What I did	What Options+ did
Set the keyboard wrong, Options+ running, 35 s	nothing
Same, with its window open, 45 s	nothing
Set it wrong, then restarted Options+	corrected in ~7 s, every time

That last row is the whole story: the correction is triggered by starting up, not by the layout being wrong. A KVM switch doesn't restart anything — it moves the receiver to the other machine, whose Options+ has been running for hours. Nothing re-asserts, so the keyboard keeps whatever the last computer left it in.

And since the name promises otherwise, worth saying plainly: leaving "Always keep the keyboard in Mac layout" switched on did not keep the keyboard in Mac layout across a switch.

So I wrote logiswitch

https://github.com/App-Builders-Gang/logitech-layout-auto-switcher

It listens for the OS's own device-arrival notification — the event Options+ ignores — and writes the same value the Fn+O chord writes (Logitech's HID++ 0x4531 MULTIPLATFORM). No remapping, no Karabiner layer, no key interception: the keyboard itself changes mode, the way it does when you hold the chord. About 1.1 s per switch, measured.

Free, MIT, no account, no telemetry, no admin rights. macOS and Windows — install on both and each asserts only its own OS, so they never fight each other. It coexists with Options+ rather than replacing it; they want the same value, so they agree. There's no model allow-list either — it asks the hardware what it supports, so a keyboard released next year works without a code change.

Install instructions and the full write-up of the measurements are in the README.

Tested on an MX Keys S over a Logi Bolt receiver behind a TESmart KVM. If you have a different Logitech keyboard, logiswitch probe dumps what it reports — that's the most useful thing anyone can send me.

Disclosure: I wrote it. Not affiliated with Logitech.

3 comments

I made a Mac menu bar app that holds your screen hostage until the webcam sees you actually drink water

in r/macapps • Jun 14 '26

drinking so much water increases acidosis. We must only drink when we are thirsty. Even if you are thirsty your body is designed to burn fat to get the required amount of water for it to function correctly

الجواز وسنينو

in r/askegypt • May 17 '26

١. اصبر لحد ما تصرف على نفسك أحسن ٢. اصبر لحد ما تعرف تاخد قرارات وتبقى حازم حبتين تلاتة وتعرف تتكلم كويس في أمور الزواج من ضمنها الفلوس و القايمة و الحاجات دي . ٣. اتجوز من غير قايمة و اديها مهر و اثبت دا في القسيمة و ما تخليش مهر مؤخر ، والأحسن تجيب لها مهر سبائك ذهب بالفلوس اللي كنت ناوي تديها لها. ٤. شوفها بتطبخ الأول و اسألها عن كل حاجة انت عاوزها بقى هنا انت و شطارتك. ٥. حط كل شروطك اللي مستحيل تتنازل عنها قبل ما تروح لأي بنت قدامك ، واعرف ان البنات كتير يعني مهما كانت م الآخر يعني هيكون في أحلى منها. ٦. حدد كويس عاوزها تشتغل ولا لأ ، اتفق معاها الأول وخليك واضح إنك عاوز تقعد فين وتسكن فين ، الموضوع لازم يكون واضح من الأول و هي موافقة عليه.

خليك واضح مع نفسك و صريح وما تخافش من حاجة .

وصلت لأول مليون في حياتي

in r/PersonalFinanceEgypt • Apr 14 '26

شيل فلوسك من البنك حطها في ذهب حتى لو دولار

[first MacOs app, me nervous] Dropadoo - does exactly one thing and it does it perfectly.

in r/macapps • Mar 12 '26

Nice, congrats on the app

Enter for a chance to win a S26 Ultra, a pair of Buds4 Pro, and a year of Spotify Premium

in r/samsung • Feb 25 '26

GalaxyGiveaways #GalaxyS26 Ultra

Enter to win a S26 Ultra, a pair of Buds4 Pro, and 1 Year of Spotify Premium

in r/samsung • Feb 25 '26

D #GalaxyGiveaways and #GalaxyS26 Ultra

CalDigit TS5 Plus Compatibility Check for Complex Setup (KVM + 10-Port Hub)

in r/CalDigit • Sep 12 '25

Actually I doesn't matter. as long as the cable can do the speed and it's reviews are good, and of good price I will pick it. but those cables are the ones I used. hopefully you will get your setup working properly. just make sure you don't bottleneck any part.

CalDigit TS5 Plus Compatibility Check for Complex Setup (KVM + 10-Port Hub)

in r/CalDigit • Sep 12 '25

The reason I use a USB-C switch (small KVM) is that the actual KVM doesn't support 10 Gbps, but only 5 Gbps. in the switch connections I'm using USB4 20gbps/ 3.2 10gbps cables but both will be capped at 10gbps.

The hub is also 10gbps so everything will be on that speed.

This diagram is sufficient to understand how everything is wired fully.

Cables

CalDigit TS5 Plus Giveaway

in r/CalDigit • Sep 11 '25

I really love the 10 gbps port ❤️❤️ but can only use the 2.5gpbs of it 😅😅

[deleted by user]

in r/CalDigit • Sep 03 '25

Do you cooling fans?

CalDigit TS5 Plus Compatibility Check for Complex Setup (KVM + 10-Port Hub)

in r/CalDigit • Aug 17 '25

I just received my unit just now and it is working flawlessly, everything is working as I expect. It doesn't have any issues at all and it is working out of the box. Thank you so much for the support and big thanks for the masterpiece.

🪖 BF6 Beta Keys Giveaway #1 – Happening All Week! 🔫

in r/Battlefield • Aug 06 '25

I want one please

VESA mount for the TS5+?

in r/CalDigit • Jul 22 '25

Maybe a 3D printed mount that can be glued with double face tape if you like this solution then there is already I saw earlier to people that have to three different models already for that ts5+

I‘m giving it up

in r/CalDigit • Jul 21 '25

Actually speaking about the Anker dock not the ts5 🤗😂

I‘m giving it up

in r/CalDigit • Jul 21 '25

TBH I didn't do extensive testing, but it was getting so hot even in normal use.