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Shift Key working irregularly i8042

co flag

I am experiencing a very inconsistent behaviour of my notebook's builtin keyboard when trying to type uppercase letters and symbols requiring the Shift key to be pressed.

Specifically some letters (T,Z,B,N) and symbols (*, _ ) will not appear when pressing Shift.

The letters which are not appearing partly differ between the left and the right Shift.

Most strangely, this behaviour is not consistent. From time to time, some of the letters do appear and some don't.

For the symbols * and _ not even the caps lock can be used.

Does anyone experience something similar or knows how to solve the issue?

I already checked this thread, which seemed to sometimes help, but never gave consistent results and I could not safely say that it was because of those changes to the GRUB parameters, that the behaviour improved.

Information about my OS:

Ubuntu 22.04.1 LTS

Information on hardware:

System Information
    Manufacturer: MEDION
    Product Name: P15648
    Version: Default string
    Serial Number: 203PE6000831
    UUID: 5ef04b80-5ed6-81ea-31c1-ac675dc0c443
    Wake-up Type: Power Switch
    SKU Number: ML-230008 30028770
    Family: Akoya

Keyboard:

AT Raw Set 2 keyboard
Sadaharu Wakisaka avatar
pl flag
Welcome to AskUbuntu. Perhaps this [bug](https://bugzilla.kernel.org/show_bug.cgi?id=215017). Would you be kind to us, next time describe your OS version/flavour and your machine model, thank you. This time the `i8042` was super important to understand what is going on.
AngelOgro avatar
co flag
@SadaharuWakisaka As mentioned I tried to edit the GRUB Default boot parameters. However it only helped very inconsistently, so I could not even say it helped.
Sadaharu Wakisaka avatar
pl flag
Wow Lenovo Median. Ask the company first.
AngelOgro avatar
co flag
The company claims that they only support Windows OS. That is the reason I am asking for help here.
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