I have a kind of same problem.

A monitor able of displaying at 1920x1080.
Intel HD Graphics 620 with driver i915/modesetting.

With old Stable (kernel 4.9.0-9) it was working fine.
With new Stable (kernel 4.19.0-6) it set max display 1024x768.

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892939

White waiting for a solution you can boot new kernel with "nomodeset"
kernel parameter, then X will use vesa driver, and it is better than
nothing, but not good for heavy graphics.

Alternative keep kernel 4.9.0-9.


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