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Lore Dosher

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Aug 2, 2024, 8:38:09 PM8/2/24

to rofpipoza

I am trying to run extended desktop over two HP Z27n G2 monitors, but one is put in a lower resolution, and I can't select the native 2560x1440 for it. They are both connected by display port to a HP USB-c dock, which is connected to the laptop by USB-c

Do you have the option to connect both monitors directly to the laptop without the HP USB-C dock and test the extended mode that way? This is just to rule out a possible restriction from the docking station.

I'm on a Latitude 7820 and the setup supports dual monitors at 1980 only. The ones at work are 1080p monitors, while at the home office I have a 1440p and a 1080p. the 1440p max resolution as a single external monitor is 1080p. Might it be a limitation of the HDMI (maybe HDMI.1?)

From all this, we can conclude that two 1440p monitors running at 60Hz can easily be supported on a DisplayPort 1.2 channel. So why is your dock not supporting both of your 1440p monitors at 60Hz? Good question! I've shown that the capability to do so is there. I am sorry, I do not understand what is going on. I could blame poor components in the dock. Could it be the fault of the cables used (both the USB-C cable and the DisplayPort cables? Yes, it certainly can.

I took a look at the specs for your laptop. The HDMI port is a direct exposure of a processor graphics output channel configured for HDMI 1.4a. With a capable, high-speed HDMI cable, you should be able to support one of your monitors at a full 60Hz. Supporting the second monitor using the dock or a USB-C to HDMI (or USB-C to DisplayPort) dongle should allow you to support the second monitor at 60Hz.

Under the Advanced heading go to System Options, then you are looking for the option "Enable High Resolution mode when connected to a USB-C DP alt mode dock" It will give you the warning about reducing performance in order to enable High Resolution mode.

Displays are Dell U2719DC. No docking station, I connect the first display directly with Usb-C cable to laptop and the first display's MST port is connected to the second displays dp in. The desktop is extended but I cannot get the correct resolution on the second display, max available is 2048x1080 and looks blurry and incorrect display ratio.

I've got a similar issue with my Lenovo T490 sitting on its docking station. Connecting each monitor individually with either DP cable gives me 4K but when I have both connected at the same time, my primary is 4K while the 2nd monitor maxes out at 2018 X 1152.

I am also using a Lenovo T490 with a USB-C docking station. I have two Acer UHD 2560X1440 (KA272U) monitors in portrait arrangement. When I duplicate the monitors they both display perfectly in 1440X2560 mode. When I extend the monitors, one stays in full resolution and the other goes to 800X1280 (the same also happens in landscape mode). I installed the latest drivers and was able to use the Intel Graphics Command Center to force a custom mode of 1440X2560 on the second monitor. But the second monitor has black bars along the long sides and a fuzzy display. The Lenovo dock specs say it will support three monitors at 3840x2160 @60Hz. Note: The good monitor says it is running a refresh rate of 59p but the monitor with the bad display says it is running at 60p. I have swapped around three different monitors, swapping DP cables, and using a HDMI cables and this did not change anything. Please help.

I've tested using HDMI / display port nothing works, I still have one of them with 1920x1080 and the other 2560x1080 i tried to change cables and switch them, only on display can use 2560x1080 at the time.

I got this to work today. I have a MSI 34" (3440x1440) in landscape and a Dell U2415 in Portrait (1200x1920). I just setup the MSI monitor over the weekend and last night, checked to make sure it worked with my work laptop (a Dell machine of some sort). When daisy-chaining the display port connection, My MSI monitor reduced its res. It ran in full res as the only monitor. I tried several different combinations, all starting from the ports on my USB-C dock.

@n_scott_pearson said this and this is what tipped me off.

"I took a look at the specs for your laptop. The HDMI port is a direct exposure of a processor graphics output channel configured for HDMI 1.4a. With a capable, high-speed HDMI cable, you should be able to support one of your monitors at a full 60Hz. Supporting the second monitor using the dock or a USB-C to HDMI (or USB-C to DisplayPort) dongle should allow you to support the second monitor at 60Hz."

After reading this, I connected the Dell monitor via HDMI directly to the HDMI port on my laptop. The DP connection goes from the dock to the MSI monitor. Instant success. No BIOS tweaking.

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