I have a brand new Lenovo T14, and I've installed Ubuntu 22.04 on it. The computer has an HDMI output, which does not show up in xrandr at all. xrandr does show my eDP-x outputs, and using a USB-C->HDMI cable does work.
In the Lenovo BIOS, I am able to choose to use an External Display instead of the laptop screen, and when I do that, the HDMI port works until Ubuntu starts loading, at which point the output dies.
My Ubuntu is as up-to-date as I know how to get it. Here are some diagnostic outputs:
xxxxxxxxx@xxx-xxx:~$ cat /proc/version_signature Ubuntu 5.15.0-43.46-generic 5.15.39
xxxxxxxxx@xxx-xxx:~$ lspci -k | grep -A 2 -i "VGA"00:02.0 VGA compatible controller: Intel Corporation Alder Lake-P Integrated Graphics Controller (rev 0c) Subsystem: Lenovo Device 22e8 Kernel driver in use: i915
This is the output of xrandr with a working external display connected with USB-C:
xxxxxxxxx@xxx-xxx:~$ xrandrScreen 0: minimum 320 x 200, current 1920 x 2280, maximum 16384 x 16384eDP-1 connected primary 1920x1200+0+1080 (normal left inverted right x axis y axis) 302mm x 188mm 1920x1200 60.00*+ 59.95 1920x1080 59.93 1600x1200 60.00 1680x1050 59.95 59.88 1600x1024 60.17 1400x1050 59.98 1600x900 59.95 59.82 1280x1024 60.02 1440x900 59.89 1400x900 59.96 59.88 1280x960 60.00 1440x810 59.97 1368x768 59.88 59.85 1360x768 59.80 59.96 1280x800 59.97 59.81 59.91 1152x864 60.00 1280x720 60.00 59.99 59.86 59.74 1024x768 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 1024x576 59.95 59.96 59.90 59.82 960x600 59.93 60.00 960x540 59.96 59.99 59.63 59.82 800x600 60.00 60.32 56.25 840x525 60.01 59.88 864x486 59.92 59.57 800x512 60.17 700x525 59.98 800x450 59.95 59.82 640x512 60.02 720x450 59.89 700x450 59.96 59.88 640x480 60.00 59.94 720x405 59.51 58.99 684x384 59.88 59.85 680x384 59.80 59.96 640x400 59.88 59.98 576x432 60.06 640x360 59.86 59.83 59.84 59.32 512x384 60.00 512x288 60.00 59.92 480x270 59.63 59.82 400x300 60.32 56.34 432x243 59.92 59.57 320x240 60.05 360x202 59.51 59.13 320x180 59.84 59.32 DP-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm 1920x1080 74.97*+ 60.00 50.00 59.94 1920x1080i 60.00 50.00 59.94 1680x1050 59.88 1280x1024 75.02 60.02 1440x900 59.90 1280x960 60.00 1280x800 59.91 1152x864 75.00 1280x720 60.00 50.00 59.94 1440x576 50.00 1024x768 75.03 70.07 60.00 1440x480 60.00 59.94 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 66.67 60.00 59.94 720x400 70.08 DP-2 disconnected (normal left inverted right x axis y axis)DP-3 disconnected (normal left inverted right x axis y axis)DP-4 disconnected (normal left inverted right x axis y axis)
Does anyone have any ideas? It seems like it's probably some kind of driver/kernel issue, but I'm stumped...I'd really like to use the HDMI output, and I know it physically "works" because setting it as the primary display in the BIOS works until Ubuntu starts up.
I'm happy to provide any additional information upon request. Thank you for your help!
-----EDIT 1-----This is the output of lspci (there appears to be no mention of Nvidia):
xxxxxxxxx@xxxxxxx:~$ lspci00:00.0 Host bridge: Intel Corporation Device 4621 (rev 02)00:02.0 VGA compatible controller: Intel Corporation Alder Lake-P Integrated Graphics Controller (rev 0c)00:04.0 Signal processing controller: Intel Corporation Alder Lake Innovation Platform Framework Processor Participant (rev 02)00:06.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x4 Controller #0 (rev 02)00:07.0 PCI bridge: Intel Corporation Alder Lake-P Thunderbolt 4 PCI Express Root Port #0 (rev 02)00:07.2 PCI bridge: Intel Corporation Alder Lake-P Thunderbolt 4 PCI Express Root Port #2 (rev 02)00:0a.0 Signal processing controller: Intel Corporation Platform Monitoring Technology (rev 01)00:0d.0 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 USB Controller (rev 02)00:0d.2 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 NHI #0 (rev 02)00:0d.3 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 NHI #1 (rev 02)00:14.0 USB controller: Intel Corporation Alder Lake PCH USB 3.2 xHCI Host Controller (rev 01)00:14.2 RAM memory: Intel Corporation Alder Lake PCH Shared SRAM (rev 01)00:14.3 Network controller: Intel Corporation Alder Lake-P PCH CNVi WiFi (rev 01)00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #0 (rev 01)00:15.1 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #1 (rev 01)00:16.0 Communication controller: Intel Corporation Alder Lake PCH HECI Controller (rev 01)00:1f.0 ISA bridge: Intel Corporation Alder Lake PCH eSPI Controller (rev 01)00:1f.3 Audio device: Intel Corporation Alder Lake PCH-P High Definition Audio Controller (rev 01)00:1f.4 SMBus: Intel Corporation Alder Lake PCH-P SMBus Host Controller (rev 01)00:1f.5 Serial bus controller: Intel Corporation Alder Lake-P PCH SPI Controller (rev 01)00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (16) I219-V (rev 01)02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller PM9A1/PM9A3/980PRO