allan gottlieb wrote:

> Dell latitude E7450 with intel 915 graphics, gnome 3, systemd.
> 
> lspci:
> VGA compatible controller: Intel Corporation HD Graphics 5500 
> (rev 09)

I think i965 is the better driver for your system, not i915. 

> 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).

Which connector are you using? HDMI output of your laptop is most 
likely limited to 2560x1600. I checked and many Latitude ultrabooks 
have a displayport (of mini variety generally) output. If you use 
that connector you may get the resolution you wanted (you may still 
need newer drivers). 

> 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?



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