XPS 17 9730, missing keystroke

The replacement unit has the same issue. How to reproduce it easily:
1. Original adapter plug in
2. Install Epic 
3. Open Epic
4. Open a txt
5. Type 1234567890 for about 10 times. 
6. You'll notice some numbers are missing. 

This issue is not about epic. A lot of other programs opened while plugged in cause this issue as well. I have tried everything I can imagine. I still think it is a bios problem but I may not have the time to wait for the solution. Might return both units. 

Another way is to enter the BitLocker recovery page (plugged in). While entering the keys, it is easy to notice some keystrokes are missing. It happens to both factory and clean-installed win11. 

I have exactly the same issue (missing keystrokes when plugged in).

I think that we can be confident that it is a BIOS related issue:

- The fact that we are at least 2 with exactly the same behavior

- The fact that this happen only when plugged-in

I have the same model, which is less than 1 month old, but i can't remember if the issue was here on factory BIOS or if the issue appeared just after i updated to latest BIOS version (which was the day i received the laptop).

As a developper, having this issue is a real pain to work correctly. I hope that if more people show that this issue exists, then BIOS team will be able to focus on this rapidly.

I do not plan to return it, since i already got this model as a replacement from my 9720, which had an issue with fans crackling when they start (which btw is also present from day 1 on my new 9730, so another BIOS issue here i think)

Overall XPS build quality and components are really nice, i think this is just a matter of fixing softwares issues, but yeah if nothing is made (or at least aknowledge) about this issue, i may have to take actions...

Let's see)

Do you have any solutions or plan to return it? This issue occurs on both my original and replacement issue, so it can be confirmed to be a common problem. 

Hi all,
Exciting Update! I-REV BIOS steps are now available on an NDA basis! 
Tech support will facilitate NDA agreements for users interested in testing and sharing the I-REV BIOS. 
Dell is actively developing a BIOS release to address this concern.  The ETA for the global/public BIOS is mid-January.
If you wish to participate, contact tech support by clicking on "Get Help Now" [on the bottom right corner of the screen] to receive the test BIOS and contribute to the ongoing improvements.
Thank you for your patience and cooperation. 

@DELL-Nat M​ Hi, Does this mean that Dell know there is a problem? I have had a Dell engineer over today and he replaced the motherboard. The problem still exists. Does this mean dell are working on a solution.  As ive typed this message it missed about 6 keys.  The output of the this sentence looked like this.  "The outpt of the this senence loked lik this."   As you can see its not very easy to work on the laptop without using an external keyboard. 

I had an email exchange with a Dell representative and made them aware of the problem. After a lot of back and forth they said they found the problem and promised it would be fixed with a bios update. Here is his email in German from November 24 where they describe the problem and promise to fix it (use Google translate if you must):

Hallo Herr Schröder,

ich wollte Ihnen noch bescheid geben, dass das Problem mit den Eingaben vollständig behoben wurde.
Die rusache war ein Timing Problem des Embedded Controllers des Systems für die Peripherie Signalverarbeitung. Dieser hat unter bestimmten Konditionen sporadische timeouts verursacht durch den für 100ms keine Inputs mehr registriert worden sind. Wenn während dieser Zeit eine Taste gedrückt wurde, ist diese Eingabe nicht registriert worden.
Ein BIOS Update ist in arbeit und sollte sehr bald veröffentlicht werden. Dieses muss aber noch durch die öblichen Zertifizierungsprozesse. Wie lange das genau dauert, hängt davon ab welche weiteren Updates mit diesem Update noch eingepflegt werden.

Sobald das Update verfügbar ist, sollten Sie aber durch Dell Support Assist oder Dell Command Update darüber benachrichtigt werden.
Das Support Ticket würde ich damit auch abschließen.

Da ich bis zum 15.12. im Urlaub sein werde, kann ich Sie dazu nicht auf dem laufenden halten. Es wird aber in der Support Knowledge base in den kommenden Tagen das erwartete Release Datum bekannt gegeben werden. Ich denke, das sbis ende komender Woche, der Support Ihnen den zeitraum nennen kann, wenn Sie dies vorab wissen möchten.

@mulgul​ well done! Thanks for posting about this issue.  I thought it was something like this.  It’s great we have a fix.  

@DELL-Nat M​ I am in an endless conversation with your Dell Support AI, even though I have posted your post I did not get a BIOS. Could you please send it to me or let me know where to get it?

@mulgul​ Hi! Could you please send me your active case number in private? So I can send that to the concerned team. 

@DELL-Nat M​ I don't know any case number

@DELL-Nat M​ Is this confirmed 100% the solution? 

I was able to get my setup to stop repeating and missing key strokes and stop mouse stalls.
My setup is a 9730 laptop with the power in one USBC port, a docking hub with internet and HDMI plug in the next USBC slot, my KVM switch into the next USBC slot and my Thunderbolt drive unit with 4 M.2 drives in the final USBC slot. This was causing key misses, repeats, mouse stalls.

I then plugged the KVM cord into the back of the Thunderbolt drive since it had a USBC port on the back and just had the drive plugged into the laptop - no more issues.

I think the Mouse/keyboard kvm and the thunderbolt were conflicting with each other plugged into separate USBC ports on the laptop. Chaining them by plugging the KVM into drive then that into the laptop cleared up the problem for me.