Screen completely goes black for around 1 second and then display comes back without going to sleep. This is happening around every 30-40 secs and makes the display unusable.
This only happens when I switch to 4k resolution (3840 x 2160) while for other resolutions (2560 x 1440), it works fine but the text is blur. Scale is kept 100% and refresh rate @ 30 fps
The display is connected to usb type-c with display port
External Display - "LG UL850"
PC - "Dell Inspiron 5509" stock
- 11th Generation Intel Core i5-1135G7
- 8GB RAM
- Nvidia GeForce MX350
OS - "Ubuntu 20.04.4 LTS (Focal Fossa)"
I checked the intel documentation for the chipset mentioned here It mentions that it can support upto 4 displays with 8k (7680 x 4320) resolution @ 60Hz. So, this shouldn't be a hardware problem.
some meta that maybe helpful
xrandr
DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
3840x2160 60.00 + 30.00
2560x1440 59.95*
1920x1080 60.00 59.94
1600x900 60.00
1280x1024 60.02
1280x800 59.81
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
lspci
0000:00:02.0 VGA compatible controller: Intel Corporation Device 9a49 (rev 01)
