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Old 06-14-2021, 02:30 PM   #1
snipe122
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Join Date: Feb 2019
Posts: 18
Default Cannot choose resolution 5120x1440

Hi,

I am running Ubuntu 21.04 on wayland and have a Philips 498P9 5k ultrawide connected to a Dell D6000 which is connected through USB-C to a Dell Latitude 5300.

The screen is connected via Displayport cable to the dock.

As to my understanding I should be able to choose the full native resolution at 60Hz.

The maximum resolution I can choose is 3840 x 1080 at 59,97 Hz both using Xorg and Wayland.

I am using the latest driver (5.4) and as per release notes it should be possible:

Quote:
C. Bugs fixed in this release
==============================
- Added support for kernel 5.11 and 5.12.
- Added nVidia g-sync monitors support.
- Added 5K Ultrawide (5120x1440 @ 60 Hz) display support for DisplayLink DL-6000 series products.
- Other reliability improvements.
Any help is appreciated

Thank you

Update: I was able to get the screen working with native resolution when connected directly to HDMI to the laptop, unfortunately that only does 30Hz. I needed to add the resolution manually and this only worked in X, not Wayland. So currently using X instead of Wayland again at 30Hz which is far from optimal... Adding the same resolution (30Hz or 60Hz) when the display is connected to the D6000 dock does not work though, when the resolution switches the display just turns black.

Update 2: I have another, small portable Dell DA300 dock. With that dock connected to USB-C and the display connected via Displayport to this dock I was able to use 5120x1440@60Hz out of the box:

Quote:
DP-1 connected primary 5120x1440+0+0 (normal left inverted right x axis y axis) 1190mm x 340mm
3840x1080 59.97 + 75.00
5120x1440 59.98*
2560x1440 74.97 59.95
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
D6000 gives the following xrandr output when the display is connected via Displayport:

Quote:
DVI-I-1-1 connected primary 3840x1080+0+0 (normal left inverted right x axis y axis) 1190mm x 340mm
3840x1080 59.97*+ 75.00
2560x1440 74.97 59.95

Last edited by snipe122; 06-14-2021 at 06:15 PM.
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Old 06-15-2021, 03:22 PM   #2
snipe122
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Join Date: Feb 2019
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Default

I was able to test this with a Windows 10 machine and the latest available drivers (10.1 M1) and I was able to run native resolution 5120x1440, even at 70Hz.

screenshot Windows.jpg

D6000 was connected via USB-C and screen via Displaylink. That means, the dock can actually handle it and it seems that this is something that needs to be fixed in the Linux driver.

Is there any chance that technical support can look at this? I tried to email but it bounced back. I would be more than happy to test a possible fix.

Thank you

Last edited by snipe122; 06-15-2021 at 03:25 PM.
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