I have some trouble with my Dell XPS 13 9300 and the WD19TB thunderbolt dock.
At the time I bought the notebook there was no developer editon available here in Germany so
I installed Ubuntu 20.04 myself with dual boot. The notebook itself works like a charm. But the WD19TB keeps troubling me:
- The external monitors work only if they are connected at boot time. Later connecting thunderbolt to the running system does not give me a signal on the external monitors.
- Even if the dock is connected at boot time the external monitors often lose the signal, went black and never come back. Connected USB devices like keyboard and mouse will come back and can be used after some seconds. I need to reboot the system to get my external monitors to work again.
On some days I can use the external monitors for hours without problem, on others I can barley use them at all.
If the monitors disconnect the following message is found in the system log:[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
I tried the following: Disable Monitor Sleep, Disabling CPU sleep modes, Newer Kernels (5.4.x up to the newest 5.6.x), even other linux distros via live USB. All had the same problem. I also tried a different WD19TB and using the other thunderbolt port on the XPS.
Under Windows there are no such problems, everything works like a charm. But I can't do my work there.
Bios and WD19TB Firmware are the lastest versions available from Dell
Thanks for reading, any help appreciated
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I have very similar issues since getting my WD19TB dock yesterday. I'm on an XPS 13 9300 developer edition upgraded to Ubuntu 20.04. The dock is plugged into a 4k monitor via DisplayPort and a USB keyboard and mouse. Plugging in the dock to the XPS results in one of the following:
1) USB devices constantly power cycle and the monitor keeps trying to find a signal, as if the dock keeps getting connected and disconnected rapidly.
2) USB devices are powered stably. Monitor tries to find a signal, but fails and eventually gives up and goes to sleep.
3) USB and monitor work, perhaps after one or two cycles of flickering. Monitor might go blank after some length of time (e.g. 30 minutes).
It seems to take around 3 attempts on average of plugging in the dock to get a picture on the monitor. I tried downgrading to an earlier BIOS; this seems to make it slightly more reliable, but it could just be random chance.
Kernel logs are full of nasty-looking messages. I'll see if I can narrow in on what's relevant to the problem.
I updated my dock firmware and will see if it makes a difference in reliability. Here is how to do it from Linux:
Download the cab file here: https://dl.dell.com/FOLDER06279838M/1/WD19FirmwareUpdateLinux_01.00.14.cab
Install it. Your dock will disconnect and reconnect during the update:
sudo fwupdmgr install ~/Downloads/WD19FirmwareUpdateLinux_01.00.14.cab
When it's done, unplug your dock, wait 60 seconds, and plug it back in.
Any progress on this guys? I am running current Arch Linux on XPS 13 9300 and have the same issues with my WD19TB dock. Note I am running the latest 9300 bios 1.0.11 and WD19TB dock firmware 01.00.14.01.