Micro/Mu () symbol key stopped working after 2004 update

  1. Posts : 20
    Win 10 Edu x64

    Micro/Mu () symbol key stopped working after 2004 update

    I'm using a German keyboard, which has an "alt graph" key (right alt key, or AltGr) to access a tertiary symbol on certain keys (in addition to a secondary symbol accessible by the shift key), for example @ (AltGr+Q), (AltGr+E) or (AltGr+M). This is common for other languages as well, which use extended alphabets.

    I realized after updating Windows 10 (Education) from 1909 to 2004 that the (AltGr+M) keyboard input no longer does anything, as if no key was pressed. All other symbols accessible by AltGr (e.g. ) still work, only the disappeared. I can't think of anything else that has happened to the system before I realized it; maybe another Nvidia GPU driver update, but nothing that could affect something as fundamental as the keyboard driver. I've checked on another 1909 system with German keyboard and the still works, but I don't have another 2004 PC to test at the moment (and I don't want to update another one while this bug still exists).

    Notably, it's not a problem with the physical keyboard because I get the same behavior when using the on-screen keyboard:

    All AltGr symbols work except for (I'm copy+pasting it right now in case you're wondering :)). Any idea where I can even start troubleshooting? I tried rebooting and switching input languages back and forth, which did nothing.
      My Computer

  2. Posts : 20
    Win 10 Edu x64
    Thread Starter

    Just a small update: It seems to be that my PC is the anomaly. I've upgraded several other PCs to 2004 and none of them has problems with the (AltGr+M) when using the German keyboard layout.

    Interestingly, when I run a Windows 10 (1909) virtual machine on my PC with the problem, I can type the inside the VM window just fine, even though it doesn't work on the host. Therefore, obviously the keycode for the is generated at the driver level (to be passed to the VM) but somehow it's ignored at some higher layer after the 2004 upgrade.
      My Computer


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