Comment 84 for bug 1766076

In case this is useful: updating the Dell XPS 15 9560 BIOS to 0.1.14.2 and Dell TB16 dock and component firmware (packaged as version 1.0.2) seems to have resolved this for me. It's been a week and I haven't seen the issue since: previously, I was seeing it around once per day. I've been unable to trigger it by e.g. connecting various USB devices (USB-A storage &/or network adaptor, USB-C HDMI adaptor) to every port on the dock and laptop. I have two Dell U2715H monitors connected via one mini-DP to DP cable, daisy chained to the second monitor, and a few USB storage devices occasionally connected to the docking station's USB-A ports.

I'm running on Linux kernel version 5.0.10 under Arch Linux (5.0.10-arch1-1-ARCH). I had to boot into Windows and run the update several (6?) times to successfully update all the various components shown on the docking station. I *think* the Multi Stream Transport (MST) firmware 3.12.002 is the fix. This firmware is still marked as "State: testing" on the Linux Vendor Firmware Service (https://fwupd.org/lvfs/device/com.dell.mst0a52c8c7.firmware).

Laptop BIOS 0.1.14.2 is not on LVFS and was also not offered via Dell Command Update: I had to visit Dell's support site to download it. However, that download now seems to have been removed from their site: https://www.dell.com/support/home/uk/en/ukbsdt1/product-support/product/xps-15-9560-laptop/drivers

```
~
➜ fwupdmgr get-topology○├─ XPS 9560 Thunderbolt Controller 3695fe182ca17c53702255daf8b4f73612bd0d2b
├─ XPS 15 9560 System Firmware f49999b6e3af5b4bf8ad1f2ed2922b76df457271
├─ Dell TB16 84edf044a6b53037732cfc7591b65a8d36384cc9
│ ├─ Dell Thunderbolt Cable b75fc95a2b3a77f2fc6895c651a92fd9c0a23be3
│ ├─ Dell Thunderbolt Dock 8a0e9a12b51f3e5f328df1feb145d18f88aebccf
│ ├─ Dell TB16 Thunderbolt Cable f8194a42320518472a2e67c1d89018c7a5219841
│ ├─ Dell TB16 Port Controller 1 b3fa3dc04e3450450bb17910417562e5b6cf69d0
│ └─ Dell TB16 Port Controller 2 4bcf1477575b55912993240dd1edd8b0ebb6d491
├─ Unifying Receiver fb1a5fd6e7d8cbf5d5a2ba7df68aee106ce41027
└─ PM961 NVMe SAMSUNG 1024GB 04e17fcf7d3de91da49a163ffe4907855c3648be

~
➜ fwupdmgr update -v
No upgrades for XPS 9560 Thunderbolt Controller, current is 21.00: 21.00=same
No upgrades for XPS 15 9560 System Firmware, current is 0.1.14.2: 0.1.12.1=older, 0.1.11.0=older, 0.1.10.1=older, 0.1.9.4=older, 0.1.7.1=older, 0.1.6.2=older, 0.1.5.0=older, 0.1.4.0=older, 0.1.3.4=older, 0.1.3.3=older, 0.1.2.4=older, 0.1.1.3=older, 0.1.0.3=older
ignoring XPS 15 9560 TPM 2.0 [cc2b222929056ab3e9a208df9f86b7d9a74ae514] as not updatable
No upgrades for Unifying Receiver, current is RQR12.08_B0030: RQR12.08_B0030=same, RQR12.07_B0029=older

~
➜
```