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U3417W, WD15, full resolution 3440x1440 60Hz?
I work from two different desks, two different buildings. Today, I'm back at desk #2 for the first time since mid-July. This is the setup:
Dell Latitude 5480 (Intel HD Graphics 630)
WD15 Docking station
U2412M (connected via VGA on WD15)
U3417W (connected via mDP on WD15)
I am almost certain that when I was here before, the U3417W had the full resolution of 3440x1440. But today, when I fired everything up, I was shocked to see the resolution was 1920x1080. After some Googling, I turned MST on, and that got me to 2560x1080. But I am simply not able to get everything on the screen I was nearly two months ago, so I'm convinced I had the full resolution before.
I'm in an environment where IT controls everything, and I have very little control over anything. I'm wondering if they did some sort of BIOS flash on the Latitude. I did run through the BIOS setup, and nothing looked obviously related to the problem. I've looked over manuals for both the U3417W and the WD15, and the results are inconclusive. I did find this, which would seem to indicate that 3440x1440 is not supported through the WD15 when there is more than one monitor connected:
Again, I don't have a lot of control, so updating drivers, etc., is not something I will be able to do on my own. But I would really like to get this crisp, sleek, curved beauty back to its full glory!
JCinMD
3 Posts
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September 5th, 2018 07:00
Thank you for the suggestion. I tried that, and the U3417W gave me full resolution. As soon as I plugged the other monitor back in, it dropped. But this led to the solution.
I had an inkling, and even tried this earlier, but might not have tried it in the right order or something. I knew the problem was bandwidth, and so earlier, I tried plugging the U2412M directly into the VGA on the Latitude (vice the WD15). Earlier, that didn't work. But just now, with the full resolution on the 3417, I plugged the 2412 into the VGA port on the Latitude, and both monitors are at their full resolutions. Bingo!
So... somebody must have sat here and for some reason thought the 2412 should be plugged into the WD15 and moved it over. Regardless, now I know, so if it happens again, I know what to do.
Thanks for your suggestion.
DELL-Chris M
Community Manager
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54.2K Posts
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September 5th, 2018 07:00
I see no reference to the WD15 being able to drive a 4K monitor resolution at 60Hz, only 30Hz.
WD15 User's Guide page 30
How to Use and Troubleshoot the Dell Dock WD15
Simplify =
* Turn all off, Latitude 5480, U3417W, U2412M
* Disconnect the AC power adapter from the WD15
* Disconnect the U2412M and VGA cabling from the WD15. This leaves only the U3417W connected to the WD15 via the mDP to DP cable and the WD15 USB Type-C cable connected to the Latitude 5480 left side USB Type-C port
* Reconnect the AC power adapter to the WD15
* Turn the U3417W on
* Turn the Latitude 5480 on
Using this single monitor setup, what is the highest resolution you can achieve at 60Hz? At 30Hz?
DELL-Chris M
Community Manager
Community Manager
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54.2K Posts
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September 5th, 2018 08:00
Just to be clear, you wrote, "I tried that, and the U3417W gave me full resolution", was that at 60Hz or 30Hz? Pressing the U3417W Menu should show at the bottom =
JCinMD
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September 5th, 2018 08:00
60Hz.
fwmone
7 Posts
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January 22nd, 2021 22:00
Just so it is documented for others that may also have this question (like I had when I wanted to buy a UWQHD screen): I'm using a U3421we screen and can confirm 3440x1440x60hz (x 8bit, 10bit are not supported) when using a DisplayPort cable, so the WD15 docking station supports it. It's my only external display. The WD15 is connected to an XPS 15 9500.