10-14-2019 05:05 PM - edited 10-14-2019 05:07 PM
Just started using TB3 Workstation dock (40AN0230EU) with P1 gen2 (20QTS06300) and ran into some issues.
Hopefully someone can help as this is geting annoying really fast.
Dock is flashed with latest firmware (3.1.64).
P1 gen 2 is flashed with latest BIOS (1.26).
230W and 135W power supplies are connected to the dock.
P1 is connected to the dock via the provided absurd power+tb3 cable (if need to connect 2 power suppllies, one of which is bigger than the dock itself, wasn't absurd enough).
P1 BIOS TB3 security is set to no security, TB3 BIOS assist is set to disabled, gfx is set to discreete, monitor to external.
I have 3 monitors connected to the dock. After a cold reboot everything is more or less fine for a few minutes, then all the displays go blank for the moment and windows pops up a notification about slow charger being connected. This keeps going on every now and then again and again.
I thought the entire point of using this absurd cable is to overcome the TB3 100W power delivery limit?
10-14-2019 07:24 PM - edited 10-14-2019 07:32 PM
There was an issue with the P1 and BIOS 1.23 which had the same issue, but this was corrected with BIOS 1.24. It sounds like the same issue is present in the P1 Gen2. Have you tried to connect the 135W power brick from the P1 system to the dock instead of the 65W supply to see if that supply is the problem. Just a thought here.
10-15-2019 12:37 AM
Sure, as stated in the thread, dock is connected to 230W + 135W power bricks.
When dock is connected to the 65W power brick, laptop doesn't charge at all.
10-15-2019 02:06 AM
The 230w supply is supposed to be the power for the P1 through the dock, not the 65w brick which is for the dock itself. Attach the 230w brick directly to the P1 w/o the dock and see if it will power the P1. It sounds like that unit is not delivering power through the dock cable.
10-15-2019 08:33 AM
Ok, I did some additionel tests and here's how the thing behaves:
There are 2 power ports on the dock, one labeled 230W/170W and the other labeled 135W/65W.
Laptop is shipped with the 135W power supply while the dock is shipped with 65W and 230W power supplies.
1) Power supplies plugged directly into laptop
- All 3 power supplies work, battery is charging, windows doesn't complain. I suspect 65W supply would not be able to charge the battery under full load as fast as it drains though.
2) Plugging only into 230W/170W port on the dock - dock not plugged into the laptop
- nothing happens, dock won't turn on - conclusion: dock itself is powered from the 135W/65W port
3) Plugging only into 135W/65W port on the dock - dock not plugged into the laptop
- for all 3 power supplies dock powers on - conclusion: dock itself is definitely powered from the 135W/65W port
4) Dock plugged into the laptop but power supply connected only to the 65W/135W port on the dock
- 65w power supply - laptop not charging
- 135W and 230W - laptop charging, windows complaining about slow USB charger being connected in both cases
- conclusion: both dock and laptop are powered from the 135W/65W port on the dock
5) Dock plugged into the laptop and both power supplies connected to the dock
- 230W power supply connected to the 230W/170W port, 135W power supply connected to the 135W/65W port - laptop charging, windows complaining about slow USB charger being connected
- 135W power supply connected to the 230W/170W port, 230W power supply connected to the 135W/65W port - laptop charging, windows complaining about slow USB charger being connected
Both dock and laptop are powered from the 135W/65W port on the dock, 230W/170W port must be used for thunderbolt devices connected to the dock itself, no idea.
However the power supplies are connected to the dock, the problem remains, windows spamming notifications about slow USB charger being connected and external monitors getting disconnected every now and then (still haven't tested if ethernet and usb ports on the dock crap out at the same time or not).
It would be nice is someone from Lenovo could comment or help out, otherwise I'm stuck with an expensive paper weight instead of docking station on the desk
10-15-2019 09:15 AM
Great problem determination of the issue. You are correct that the dock is powered from the 65W/135W socket and the 230W supply is to power the attached system. The P1 will try to charge through the TB3 port if the slim power port does not have power. So, either the combo cable from the dock to the P1 is defective for the 230W flow or the dock itself has a defect for the 230W electrical path from the 230W brick to the combo cable. Time to call for a replacement.
10-22-2019 07:07 AM
Just a minor update...
Checked what Lenovo Vantage has to say about which power brick is connected.
Note that plugging anything into 230W/170W port or just leaving it unplugged has absolutely no effect on the behaviour.
1) 65W brick connected to the 135W/65W port - Vantage pops up a notification saying dock is not supplying enough power to charge the laptop
2) 135W or 230W brick connected to the 135W/65W port - Vantage reports 65W power supply connected in both cases
Also measured the voltages on the slim tip on the strange dual cable thing coming out of the dock:
- all power bricks show around 20V when measured directly on their slim tip.
- slim tip on the dual cable shows 0V regardless of which power supply is connected to which port on the dock (when laptop is not connected ofc)
Also measured the resistances between inner pin and the outter layer on the slim tip:
- 65W brick shows around 268ohm resistance
- 135W brick has resistance of about 1kohm
- 230W brick has resistance of about 4.6kohm
- measurement on the slim tip on the docking station cable shows inf. resistance (when laptop is not connected ofc)
All this is leading me to believe dock is not supplying power at all on the slim tip end but only some power directly via the thunderbolt connection which is not enough for P1 gen 2 to charge.