Dell XPS 9360 external display resolution

Question

I have Dell XPS 9360 and Dell WD15 dock station. External 4K-display Samsung U24E850 is connected to the dock by mDP cable. The problem is that according to WD15 documentation it supports 4K-resolution (OK, only 30Hz). But in windows display parameters and in Intel UHD Settings the maximum resolution is 2560*1440. All updates installed. WD15 firmware also has been updated. I want to have 4K resolution !! Any ideas? Addition - I have active USB-C-to-HDMI converter, and I get 4K 60Hz without any problems. But I want to use WD15

jphughan · Answer

You might have to drop the refresh rate to 30 Hz in order to allow the 4K resolution to appear.  2560x1440 would be the maximum resolution you can run at 60 Hz on that display through the WD15, so that might be the issue.  You could also try creating a custom resolution in the Intel Control Panel.  Also note that you would not be able to run any other display through the WD15 when running a 4K 30 Hz display.  If the single monitor and/or 30 Hz limitations ever become an issue, since you have an XPS 13 9360 you might want to look at the TB16 dock instead.  It supports dual displays up to 4K 60 Hz and even some triple display configurations because it has access to 4x more video bandwidth than the WD15 since it uses Thunderbolt 3 rather than USB-C -- and the XPS 13 9360 includes Thunderbolt 3 as standard.

zlodei2000 · Answer

I know about 4K 30Hz limitation for WD15 dock. But it's not possbile to set even 30Hz ( When I try to create custom resolution in Intel app, I get error about 'maximum bandwith limit'. Fail ...Sure TB16 dock is the better choice. But I already have WD15

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