Hey everyone, Linux noob here. Since upgrading from Bionic to Focal, my ability to support multiple
monitors has effectively disappeared. I’ve seen similar questions asked, but I’ve yet to find a workable solution. System info and Xrandr outputs below
- HP Revolve 810 G1 closed lid
- Intel Core i5-3437U CPU @ 1.90GHz
- 2x Dell U2415 monitors connected to a HP slim docking station with 2x DP outputs (I believe they’re DP 1.2)
- Intel® HD Graphics 4000 (IVB GT2)
- Ubuntu 20.04.1 LTS
- GNOME 3.36.3 X11
- X.Org version 1.20.8
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
DeviceName: 64
Subsystem: Hewlett-Packard Company 3rd Gen Core processor Graphics Controller
Kernel driver in use: i915
Kernel modules: i915
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
LV-DS-1 connected (normal left inverted right x axis y axis)
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
HDMI-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
1920x1080 60.00
DP-3 disconnected (normal left inverted right x axis y axis)
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:32 memory:d0000000-d03fffff memory:c0000000-cfffffff ioport:2000(size=64) memory:c0000-dffff
It seems like there an awareness of DP-2, but no matter how I connect the cables or which cables I use (directly to dock, dock to laptop’s built-in DP output, or daisy-chaining), nothing changes, and my second monitor is black.
I know multiple displays are supported because when I open the lid I get multiple displays (LVDS and DP-1). Let me know if there’s more info or troubleshooting steps I need to take.