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Old 09-18-2022, 07:57 PM   #1
domehead100
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Default Which chipset do I have?

I'm on Linux but on NixOS (not Ubuntu). I'm trying to get DisplayLink working in order to drive more displays than the limit of 4 provided by the integrated GPU on my laptop.

As a note, this is an HP ZBook Power G9 laptop with an Intel i7-12700H CPU and an Nvidia T600 discrete GPU, but the nvidia GPU apparently only functions in Optimus/Prime mode.

As a further note, I actually have 2 docks: HP Thunderbolt 280W Dock G4 (off of which the laptop screen and 3 external monitors are being driven), and an HP Universal USBC/A Dock G2 (which uses DisplayLink and is what I'm trying to set up to drive 2 or 3 additional displays). All displays are 1080p.

Using the fwupdmgr utility (for updating firmware), I see the following for the DisplayLink dock:

─HP USB-C Universal Docking Station:
│ Device ID: fc6da820357c954f813bc50790f9ea7fbf0aed9b
│ Current version: 31.2
│ Vendor: DisplayLink (USB:0x17E9)
│ Serial Number: 43A5B830EEA
│ GUIDs: 3a11c4a7-a4a8-5cfc-b9aa-047dfb15f21e ← USB\VID_17E9&PID_601E
│ 3ac5f23c-a246-5799-a372-ecba091ee7e4 ← USB\VID_17E9&PID_601E&REV_3102
│ Device Flags: Updatable


In trying to get some driver working, I think that I need to know the DisplayLink chipset family. I assume that it is a DL-6000 series, but if not then I assume that someone here can tell me what it is based on the PID 601E and the REV 3102?

Any other random tips would also be welcome. Thus far I haven't been able to get the DisplayLink provider to show up in xrandr --listproviders.
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Old 09-18-2022, 08:03 PM   #2
domehead100
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Default More info

In case it's helpful, below is some info from dmesg.

I see "failed to retrieve link info, disabling eDP" and the three errors at the bottom, but I don't know what those mean or if they are meaningful at all.

dmesg | grep -E 'udl|DisplayLink|\[drm\]'
[ 2.733204] i915 0000:00:02.0: [drm] VT-d active for gfx access
[ 2.737156] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/adlp_dmc_ver2_10.bin (v2.10)
[ 2.764203] [drm] Initialized nouveau 1.3.1 20120801 for 0000:01:00.0 on minor 0
[ 3.412064] i915 0000:00:02.0: [drm] failed to retrieve link info, disabling eDP
[ 3.988179] i915 0000:00:02.0: [drm] GuC firmware i915/adlp_guc_62.0.3.bin version 62.0 submission:enabled
[ 3.988184] i915 0000:00:02.0: [drm] GuC SLPC: enabled
[ 3.988186] i915 0000:00:02.0: [drm] HuC firmware i915/tgl_huc_7.9.3.bin version 7.9 authenticated:yes
[ 3.988601] i915 0000:00:02.0: [drm] GuC RC: enabled
[ 4.288870] usb 2-2.2: Manufacturer: DisplayLink
[ 5.128455] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 1
[ 5.246772] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device
[ 2317.035991] usbcore: registered new interface driver udl
[ 5644.647349] i915 0000:00:02.0: [drm] *ERROR* mstb 000000005b5891d3 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[ 5644.655370] i915 0000:00:02.0: [drm] *ERROR* mstb 000000005b5891d3 port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed
[ 5644.663373] i915 0000:00:02.0: [drm] *ERROR* mstb 000000005b5891d3 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
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Old 09-18-2022, 08:09 PM   #3
domehead100
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Default More Info

It also appears that my evdi version is 1.12.0. Following the instructions on the NixOS wiki, I installed the ubuntu-5.4.1 driver at this point.

I'm wondering if that driver is too old to support the chipset in the universal dock, which is what prompted the original question.
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