Hello Pierre!

> Are you running Guix System?
> 
> If so, try using an older kernel, this could be your issue.
> If not the kernel, it could be something related to the video stack,
> e.g. Mesa.  If you still have some generations at hand, try bisecting
> which generation is at fault.

So I shifted my kernel to version 4.9. I still face the same issues.
But if something is wrong with mesa, what should I do? There is only
one version available in guix.

Regards,
RG.