09-05-2019 09:23 AM
Thanks for posting, but this seems to be geared toward users of the Thunderbolt 3 Graphics Dock which I don't have.
I've installed the BIOS update and the Intel chipset drivers with the result that the dock isn't recognized anymore...
09-05-2019 10:04 AM
Great, so my dock isn't recognized anymore and I don't have a 1.23 BIOS backed up. Nothing else changed. In a sense the changelog is right, it surely doesn't show "your PC isn't charging" anymore, though.
I'am seriously impressed how buggy this whole Thunderbolt 3 mess is. I've read people saying it is a bit "flaky", but since I've never owned a TB3 device and my last contact with Lenovo docking solutions was that oldschool dock with the proprietary connector that worked great I didn't expect anything too bad. I mean, how hard can it be, connect one monitor and two USB devices? Boy, I had no idea... so, before that BIOS update I had this lag problem which is now solved since my dock isn't recognized anymore. I'll give Lenovo that.
At work I have to use a P52 for which I had to disable automatic screen shutdown because 1 out of 3 times the screen didn't turn on again and I have to reboot. Or the HDCP link, sometimes it works, sometimes it doesn't. No pattern. But that is just a side note, the ways in which these TB3 docks don't work are a story in and of itself.
Anyway, this will be my last Lenovo machine (too bad I've already paid for it, right?) and next time I'll do my research on how bad these TB3 docking solutions really are.
09-05-2019 10:30 AM - edited 09-05-2019 11:48 AM
Edit: Sorry for the rant, turns out the problem was something else.
What helped for me:
Take a look into the device manager, under "system devices" there is a device "PCI Express Upstream Switch Port". This device was deactivated for me. When I activated it again the dock started working again, also with BIOS 1.24.
I don't know why it was deactived all of the sudden, but here I go. I'll see if the lag issue went away with the new BIOS and report back later.
09-10-2019 10:19 AM - edited 09-10-2019 10:28 AM
Whenever I connect external monitor or TV via HDMI the computer is slow/lagging (even moving windows or doing a right click is slow).
I tried to isolate the problem and it seems to happen only when I use "Second screen only" or when the laptop lid is closes, if the lid is open and I use "Extend" or "Duplicate" everything's fine. Also, if I do reset while the monitor is still connected, it's working ok (but this is not a good solution for me as I want to keep the work evniornment).
I tried playing with Display settings but nothing seems to help, maybe the community can please help me?
09-11-2019 01:08 AM
My issue is same as described. When it is on extended screen only, there is a lag on the screen. I did the following and is now resolved.
Go to device manager/ display adapters/ intel(R) UHD Graphics 630 – disable and re-enable the device by clicking properties/ drivers tab.
09-17-2019 11:34 PM
09-18-2019 09:03 AM
For myself and others, the "fix" was to disable hybrid graphics in the BIOS. Yes, this did completely resolve the issue, although it's a shame that this is what needed to be done at all. As a brief explanation of the problem, this laptop has two graphics cards: An integrated Intel 630 gpu, and a more powerful discrete (separate) NVIDIA GeForce GTX 1650 gpu. By default, the laptop uses a "hybrid" mode which uses both graphics cards in an attempt to conserve battery; it will use the lower powered Intel gpu during low graphics operations, then it will dynamically switch to using the more powerful NVIDIA gpu during graphics intensive workloads.
I imagine the problem here is with this gpu handoff which seems to occur when the laptop is docked and/or a larger external monitor is connected. By switching the display settings in the BIOS from "hybrid" to "discreet", you are telling the system to always use the NVIDIA gpu, and it will no longer use the Intel gpu thus eliminating this gpu handoff operation completely. The caveat to this is that it will most likely decrease your battery life. I personally didn't notice much of a battery drain difference and the change was effective and permanent.
That being said, this is still unacceptable on Lenovo's part and this should be resolved with an update. I hope this helps.