@roband67 According to the specs page for that display here, it has a native resolution of 3280x2048, so I'm not sure why you say that each display needs to run at 1560x2048. Also, I'm going to assume you have a Precision 5540, not a Latitude 5540, because the closest thing to a Latitude 5540 is the Latitude E5540, which is quite old and doesn't have a USB-C/TB3 port and therefore wouldn't be usable with a WD19TB.
If you do in fact have a Precision 5540 and you're trying to run both of your displays at their native resolution of 3280x2048, then be aware that the WD19TB has special cabling requirements when high resolution displays such as 4K or "near-4K" in your case are involved, and those requirements differ based on whether the source system uses DisplayPort 1.2/HBR2 or DisplayPort 1.4/HBR3. The Precision 5540 uses the former, and in that case, when running two high resolution displays like that, one of them has be connected to the "downstream" TB3 port at the edge of the dock (NOT the USB-C port near the HDMI output!), using something like a USB-C to DisplayPort cable. This relates to how the dock allocates display bandwidth that it receives from the system, which again varies based on what type of signal the system is sending. This is all explained in the WD19TB User Guide available on support.dell.com, specifically the Display Resolution Table section.
As for Intel vs. NVIDIA GPUs, the Precision 5540 has all display outputs wired to the Intel GPU. The NVIDIA GPU can still operate as a render-only device through NVIDIA Optimus, but it doesn't have direct control of the display outputs. This is a hardware design aspect of the system and is not configurable. The XPS 17 and Precision 5750 offer a BIOS option allowing you to have the NVIDIA GPU take direct control of the display outputs, but that isn't available on your system. That said, for most use cases it isn't necessary. NVIDIA GPU direct control is mostly needed for gaming-related use cases like G-Sync, Adaptive V-Sync, and VR. Most applications work just fine through Optimus, although if your application doesn't, then unfortunately there's nothing you'd be able to do about that with your current system.
AlbertWynn
1 Message
0
August 24th, 2020 09:00
Have you tried running Dell Command in order to check for any graphic / docking driver updates?
jphughan
9 Legend
•
14K Posts
0
August 24th, 2020 10:00
@roband67 According to the specs page for that display here, it has a native resolution of 3280x2048, so I'm not sure why you say that each display needs to run at 1560x2048. Also, I'm going to assume you have a Precision 5540, not a Latitude 5540, because the closest thing to a Latitude 5540 is the Latitude E5540, which is quite old and doesn't have a USB-C/TB3 port and therefore wouldn't be usable with a WD19TB.
If you do in fact have a Precision 5540 and you're trying to run both of your displays at their native resolution of 3280x2048, then be aware that the WD19TB has special cabling requirements when high resolution displays such as 4K or "near-4K" in your case are involved, and those requirements differ based on whether the source system uses DisplayPort 1.2/HBR2 or DisplayPort 1.4/HBR3. The Precision 5540 uses the former, and in that case, when running two high resolution displays like that, one of them has be connected to the "downstream" TB3 port at the edge of the dock (NOT the USB-C port near the HDMI output!), using something like a USB-C to DisplayPort cable. This relates to how the dock allocates display bandwidth that it receives from the system, which again varies based on what type of signal the system is sending. This is all explained in the WD19TB User Guide available on support.dell.com, specifically the Display Resolution Table section.
As for Intel vs. NVIDIA GPUs, the Precision 5540 has all display outputs wired to the Intel GPU. The NVIDIA GPU can still operate as a render-only device through NVIDIA Optimus, but it doesn't have direct control of the display outputs. This is a hardware design aspect of the system and is not configurable. The XPS 17 and Precision 5750 offer a BIOS option allowing you to have the NVIDIA GPU take direct control of the display outputs, but that isn't available on your system. That said, for most use cases it isn't necessary. NVIDIA GPU direct control is mostly needed for gaming-related use cases like G-Sync, Adaptive V-Sync, and VR. Most applications work just fine through Optimus, although if your application doesn't, then unfortunately there's nothing you'd be able to do about that with your current system.