[gentoo-user] new hi-res display won't work at top res

[allan gottlieb]

Dell latitude E7450 with intel 915 graphics, gnome 3, systemd.

lspci:
VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

I just bought a new dell 34" curved monitor (U3417).
It's max res is 3440X2560, but at that res it complains that no signal
is coming.  It works fine at other res (including 2560x1440).

The dell manual says to get new drivers and I am indeed running an old
kernel, 3.18.16-gentoo.  The highest stable is 4.9.16 and I am planning
to build and employ it this summer.

Has high res support been added to the intel graphics driver?

thanks,
allan