Matthias Apitz wrote: 
> The tablet runs a modified Debian OS, with the name PureOS.
> 
> Accidentally I cracked its display in 2023. We (my 16 years old son and I) 
> were
> able to take the tablet apart, which is not an easy thing because it is
> not designed for this (the LCD is glued in). My other, son who lives and
> works in China/Taiwan, was able to get the LCD from its manufacturer there
> and yesterday we connected it to the PCBA and assembled enough to make
> the L11 booting again. It boots, the LCD shows the messages and the Gnome
> desktop, but needs an external keyboard and mouse because the
> touch-layer of the LCD does not give any key input.
> 
> I could imagine that nothing were working, but because of the working
> display I think more in an issue in the driver, or some whitelisting
> missing of the now mounted model of the LCD.
> 
> I'm willing to dig into this, starting with the source of the driver. I
> can nicely SSH into the tablet and debug what is necessary.
> 
> Short question: from where and how could I git clone the kernel sources.

Nobody except purism can answer that for purism.

Debian kernel source is available by making sure you have
deb-src lines configured in your /etc/apt/sources.list (or in
the sources.list.d subdir) and running

apt install linux-source

This doc might be useful to you:

https://kernel-team.pages.debian.net/kernel-handbook/index.html

-dsr-

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