"vychytraly ." vychytraly@gmail.com wrote:
I forgot to write that the dots start to appear only inside "Desktop Environment" (in my case Gnome), not for example in grub/bios. Today I tried to install ubuntu 16.04 and the green dots appeared there too (in Unity).
Video BIOS isn't the same as the usual video graphics: https://en.wikipedia.org/wiki/Video_BIOS . I think that's still true with UEFI.
In other words, I would suspect a hardware problem or a driver problem rather than a software problem.