I’ve had problems that have arisen with a dual external display setup I’ve got for my laptop used for research. One monitor is connected via HDMI and the other via a Thunderbolt-to-Display Port cable that’s connected to one of two TB4 ports. The laptop is running Ubuntu 24.04.3 LTS and, the current nvidia driver is nvidia-driver-580-open (580.82.09)
Early on in the syslog I find this strange reference (whether the DP cable is plugged in or not):
[ 4.760801] nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device DP-0
[ 4.773887] nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device DP-0
DP-0 is what the monitor would be labelled as, if it was plugged in and detected - but it’s not, so I don’t understand this reference.
Finally - this monitor DID work at one time using the two-monitor combo that I am wanting to use - but after a wakeup after the computer slept overnight, the monitor came up blank when I revived it, and since then it’s never been detected.
I really am puzzling over this - none of this makes sense.
So here are a few things - but I’ll need help knowing what information someone needs to help me.
Ubuntu: 24.04.3 LTS
Linux Kernel:
Linux feynman 6.17.9-76061709-generic #202511241048~1764607909~24.04~df6b2b6~dev-Ubuntu SMP PREEMPT_DY x86_64 x86_64 x86_64 GNU/Linux
The NVIDIA control panel shows this (I’ve just picked off a few of the screens that I think may be relevant):
When I plug in the monitor, nothing in the NVIDIA settings changes. I get a detection at the TB port, but it describes the connection as a USB connection:
[ 4411.957994] usb 3-10: new full-speed USB device number 7 using xhci_hcd
[ 4412.083880] usb 3-10: New USB device found, idVendor=1e4e, idProduct=720b, bcdDevice= 1.00
[ 4412.083885] usb 3-10: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 4412.087375] hid-generic 0003:1E4E:720B.0008: hiddev2,hidraw6: USB HID v1.10 Device [HID 1e4e:720b] on usb-0000:80:14.0-10/input0
I’d have expected the response to say something about a Display Port connection, but maybe that’s a naive expectation.
output of nvidia-smi:
Wed Jan 7 17:28:25 2026
±----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.82.09 Driver Version: 580.82.09 CUDA Version: 13.0 |
±----------------------------------------±-----------------------±---------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce RTX 5070 … Off | 00000000:02:00.0 On | N/A |
| N/A 53C P8 13W / 100W | 942MiB / 12227MiB | 0% Default |
| | | N/A |
±----------------------------------------±-----------------------±---------------------+
±----------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=========================================================================================|
| 0 N/A N/A 2860 G /usr/lib/xorg/Xorg 517MiB |
| 0 N/A N/A 3154 G /usr/bin/gnome-shell 94MiB |
| 0 N/A N/A 5208 G /usr/bin/nvidia-settings 3MiB |
| 0 N/A N/A 5429 G …rack-uuid=3190708988185955192 240MiB |
±----------------------------------------------------------------------------------------+
If anyone has any idea what I should try or whether they think this is likely a hardware failure, let me know.
I’ll be happy to provide any and all information that would be helpful.
Thanks,
Todd