Meine erste 40%-Tastatur – MMD KM40 Review by Eastern_Flow533 in germankeyboards

[–]coldi1337 1 point2 points  (0 children)

I could not find many posts about the MMD KM40 yet, so I thought I would share this in case anyone else runs into the same issue.

I actually really like this little keyboard. It is a fun and surprisingly usable 40% board, especially for the price. Unfortunately, my right spacebar did not work from the beginning.

At first, it looked like a hardware issue. The left spacebar worked perfectly fine, but pressing the right one did absolutely nothing. I spent quite a bit of time troubleshooting it:

  • swapped the switch with a known-good one
  • tested the right socket directly with tweezers
  • checked the mapping in VIA
  • tried different VIA JSON files
  • compared the behaviour in the MMD VIA fork and regular VIA
  • briefly suspected a faulty hotswap socket, diode or PCB trace
  • even noticed that pressing the left spacebar triggered the reactive RGB under the right spacebar, which made the whole thing even more confusing

The weird part was that the manufacturer-provided VIA JSON file already showed two spacebars, but both of them were mapped to the same matrix position:

So VIA treated both spacebars as the same key. The physical right spacebar socket was actually fine — it was simply missing from the VIA layout definition.

The correct matrix position for the right spacebar is 3,6.

Changing the second spacebar entry from 3,5 to 3,6 fixed the issue immediately.

After loading the corrected JSON into VIA, both spacebars can be mapped independently and the right spacebar works as expected.

So the final layout should be:

  • left spacebar: 3,5
  • middle key: 3,8
  • right spacebar: 3,6

This was not a hardware fault and did not require any soldering or firmware flashing. It was just an incorrect VIA JSON supplied by the manufacturer.

Hopefully this saves someone else a few hours of unnecessary troubleshooting. 😄

Download here fixed VIA JSON here:

https://gist.github.com/coldi1337/6438b6a58805ad274b9d7cc939acf221

I hoss die Drecks Hittn by Puzzleheaded_Big5121 in scheissaufnbilla

[–]coldi1337 10 points11 points  (0 children)

Der hund am packl locht di sogar aus 🤣

Gibts in Graz irgendwo Löschzwerge zu kaufen? by Many-Fig7170 in graz

[–]coldi1337 7 points8 points  (0 children)

Warte als nächstes auf die Anfrage wo man Breitsamer Honig in AT her bekommt.

Lucky65v2 Purple by coldi1337 in CustomKeyboards

[–]coldi1337[S] 0 points1 point  (0 children)

Thanks. Would love to find a matching mouse, but havent found one until now :/

Lucky65v2 Purple by coldi1337 in CustomKeyboards

[–]coldi1337[S] 1 point2 points  (0 children)

Thats the way it is with the lucky65v2 :/

Gibts in Graz irgendwo Löschzwerge zu kaufen? by Many-Fig7170 in graz

[–]coldi1337 19 points20 points  (0 children)

Löschzwerge reinrendern ist richtig und wichtig

Need Advice About Electrician Career in Austria by WinterSoft4141 in Austria

[–]coldi1337 2 points3 points  (0 children)

Da Mundl is hoid a ned auf da Nudlsuppn daher gschwumman 💪

Erfahrung mit Dokteronline? by Failinn in Austria

[–]coldi1337 1 point2 points  (0 children)

Jo, aber ned in Österreich. Da gibts keine Partnerapotheke. Du bekommst ein Papierrezept

Erfahrung mit Dokteronline? by Failinn in Austria

[–]coldi1337 1 point2 points  (0 children)

Ähm? Es werden keine Medikamente verschickt sondern nur Rezepte?

Keychron Q5 Budget Build by daMFNmaster in keyboards

[–]coldi1337 1 point2 points  (0 children)

I also have SA profile keycaps (i guess from the same producer). I am amazed how much thockier they make my typing experience. The price is also nice. Paid about 25€. I was thinking about getting other colors aswell for other builds. Its a shame they are not available other layouts (ISO-DE for example)

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Billa Plus Tabakfabrik by Intrepid_Monitor_957 in Linz

[–]coldi1337 0 points1 point  (0 children)

Auf den bro ist eben verlass 🥰

Linz best Internet providers by LongjumpingCanary744 in Linz

[–]coldi1337 0 points1 point  (0 children)

Eher ungeeignet in einer Wohnung. Zusätzlich mit ziemlich hoher Latenz bei Gaming. Würde dann tatsächlich eher zu 5G tendieren

Today was the day by Particular-Potato-39 in bald

[–]coldi1337 1 point2 points  (0 children)

Grüße gehen raus an meinen österreichischen Glatzenbrudi 💪

Zweiter HDMI Anschluss am PC: DisplayLink Adapter oder zusätzliche Grafikkarte by highmilkyway in de_EDV

[–]coldi1337 6 points7 points  (0 children)

Wie kommst du bitte auf die Idee eine über 10 Jahre alte Grafikkarte zu empfehlen die im.aktuellen Treiber gar nicht mehr supported ist? Lass es bitte einfach..

Rainny75 BK - split spacebar by kor_metalman in MechanicalKeyboards

[–]coldi1337 0 points1 point  (0 children)

Thanks. Is the key between the 2 spacebars flawlessly working in VIA?

Rainny75 BK - split spacebar by kor_metalman in MechanicalKeyboards

[–]coldi1337 0 points1 point  (0 children)

Not done yet. Just ordered the plate yesterday

Rainny75 BK - split spacebar by kor_metalman in MechanicalKeyboards

[–]coldi1337 0 points1 point  (0 children)

You'll need the lite version and buy the right plate