External monitors not connecting - Intel Graphics 630

I just set up dual-boot on my Dell Optiplex 5060 that came with Windows 10. I never had issues with my monitors on Windows. Now that I'm in Ubuntu (20.04 LTS, Kernel 5.4), the main monitor works but the second and third are black. I've tried googling for hours and haven't been able to detect the issue. Any suggestions would be greatly appreciated as I am very much looking forward to getting my Ubuntu station up and running. thanks!

$ xrandr

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384

DP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 476mm x 268mm

1920x1080 60.00*+

1680x1050 59.95

1280x1024 60.02

1440x900 59.89

1280x800 59.81

1152x864 75.00

1280x720 60.00

1024x768 70.07 60.00

800x600 60.32 56.25

640x480 66.67 59.94

720x400 70.08

HDMI-1 disconnected (normal left inverted right x axis y axis)

DP-2 disconnected (normal left inverted right x axis y axis)

HDMI-2 disconnected (normal left inverted right x axis y axis)

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$ sudo lspci -v

00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)

DeviceName: Onboard - Other

Subsystem: Dell 8th Gen Core Processor Host Bridge/DRAM Registers

Flags: bus master, fast devsel, latency 0

Capabilities: \[e0\] Vendor Specific Information: Len=10 <?>

Kernel driver in use: skl\_uncore

Kernel modules: ie31200\_edac

00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Desktop) (prog-if 00 [VGA controller])

DeviceName: Onboard - Video

Subsystem: Dell UHD Graphics 630 (Desktop)

Flags: bus master, fast devsel, latency 0, IRQ 126

Memory at d0000000 (64-bit, non-prefetchable) \[size=16M\]

Memory at c0000000 (64-bit, prefetchable) \[size=256M\]

I/O ports at 3000 \[size=64\]

Expansion ROM at 000c0000 \[virtual\] \[disabled\] \[size=128K\]

Capabilities: \[40\] Vendor Specific Information: Len=0c <?>

Capabilities: \[70\] Express Root Complex Integrated Endpoint, MSI 00

Capabilities: \[ac\] MSI: Enable+ Count=1/1 Maskable- 64bit-

Capabilities: \[d0\] Power Management version 2

Capabilities: \[100\] Process Address Space ID (PASID)

Capabilities: \[200\] Address Translation Service (ATS)

Capabilities: \[300\] Page Request Interface (PRI)

Kernel driver in use: i915

Kernel modules: i915

00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model

DeviceName: Onboard - Other

Subsystem: Dell Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model

Flags: fast devsel, IRQ 255

Memory at d11c5000 (64-bit, non-prefetchable) \[disabled\] \[size=4K\]

Capabilities: \[90\] MSI: Enable- Count=1/1 Maskable- 64bit-

Capabilities: \[dc\] Power Management version 2

Capabilities: \[f0\] PCI Advanced Features

...