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Multiple Displays Through Dock
03-30-2019, 02:57 PM
Post: #1
Multiple Displays Through Dock
I have a laptop with Intel 620 graphics trying to run 2 1440p monitors through a thunderbolt 3 dock. I have run into an issue where one of the external monitors is detected and working correctly, while the other shows an active signal resolution of 1280 x 800. I found this thread describing the same issue, but there is no true fix found other than changing the active signal resolution in the display adapter properties, then selecting the appropriate resolution under list modes. Unfortunately, 1440p is not listed as an option for the one display. I hoped CRU would be able to override this, but it saw both monitors as 1440p, and I saw no place to modify active signal resolution. This is happening both on my Lenovo T480 and my Razer Blade Stealth using this Lenovo Dock. I have attached a screen shot of the display settings, as well as the .bins from the working and not working external monitors. Is there some way to override the active signal resolution to add my resolutions in?


Attached File(s) Thumbnail(s)
   

.bin  good monitor.bin (Size: 128 bytes / Downloads: 71)
.bin  bad monitor.bin (Size: 128 bytes / Downloads: 68)
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03-30-2019, 06:08 PM
Post: #2
RE: Multiple Displays Through Dock
That dock doesn't have enough bandwidth to support two 2560x1440 @ 60 Hz monitors. That would require 14.49 Gbps of bandwidth, but USB 3.1 only supports 10 Gbps. You would have to drop both monitors to 40 Hz.
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03-30-2019, 06:39 PM
Post: #3
RE: Multiple Displays Through Dock
(03-30-2019 06:08 PM)ToastyX Wrote:  That dock doesn't have enough bandwidth to support two 2560x1440 @ 60 Hz monitors. That would require 14.49 Gbps of bandwidth, but USB 3.1 only supports 10 Gbps. You would have to drop both monitors to 40 Hz.

Ah okay, I wasn't sure if that dock was running Thunderbolt or not. Was able to use CRU to get the 40 Hz and a couple of restarts later they were running at 1440p. Thank you sir.
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