screen resolution 1280x1024 to 1600x1050

Hello all!!

In the first place before you throw rocks on me i know this is trisquel site and not debian. But what i am asking is not for *debian things only*.
I did a fresh install of Debian KDE from Jessie (8) to Stretch (9).
I want to change monitor resolution to 1600x1050. You see below my pic showing that is 1280x1024 maximum screen size.
When i was on Debian Jessie i went to https://jxself.org/linux-libre/ site and did it. All went smooth. As before was 1280x1024 automatically changed to the correct screen size to 1600x1050.
Now before changing anything i want to ask you guys if i go to jxsef.org again and download kernel series 4.8 will work? I mean: i did uname -a and the display was

Linux debian 4.8.0-1-amd64 #1 SMP Debian 4.8.5-1 (2016-10-28) x86_64 GNU/Linux

So as you see there is kernel 4.8.0-1 but in January i think this Stretch Debian will turn stable. But jxself says on his site that "A new long-term version will be selected roughly once each year. The next will be 4.9, which is expected in December 2016."
So at the moment as i am writing this we are on 22 November. Just a few more days and i can expect this stable 4.9 will available in a few days.
So his site has 4.1 kernel (that is pretty old compared to 4.8 kernel). And has 4.8 kernel, that only will lives for 2 months. 4.9 kernel is not available for now.
What i do?
Thanks in advance, best regards.