05-08-2017 10:44 AM - edited 05-08-2017 10:48 AM
While testing out my new 720 I found that while running on battery I will have anything connected to the USB C/lightning port disconnect every once in a while and then almost immediately reconnect.
I've had this happen with an external SSD and a small multi-port dock. So far, this problem only happens with that one port. If I use the USB 3 ports, I haven't had this happen.
I'm fully up to date driver-wise.
I have also tried turning off the power settings for all the USB hubs.
I've monitored the windows events and see the following confirmation of a problem but I believe this to be a symptom and not the actual problem.
Warning 5/7/2017 1:53:19 PM Ntfs (Microsoft-Windows-Ntfs) 140 None
Warning 5/7/2017 12:02:35 PM Ntfs (Microsoft-Windows-Ntfs) 140 None
The system failed to flush data to the transaction log. Corruption may occur in VolumeId: M:, DeviceName: \Device\HarddiskVolume18.
(A device which does not exist was specified.)
The IO operation at logical block address 0x5f1388 for Disk 1 (PDO name: \Device\000000c7) was retried.
05-08-2017 03:27 PM
It looks like this could be a larger problem with either the type of external enclosure I'm using or with USB 3.1 controllers.
When connected to AC and with the following connected, I had a complete reset of the raid controller.
Crucial MX300 1TB M.2 (2280) Internal Solid State Drive (CT1050MX300SSD4)
Cable Matters USB-C Multiport Adapter with 4K HDMI or VGA Video, USB 3.0 and Gigabit Ethernet (Thunderbolt 3 Port Compatible) which uses a SMedia ASM1351 bridge
StarTech.com Portable M.2 SSD Enclosure for USB C Enabled Host, Aluminum (SM21BMU31C3)
At this point I couldn't even get the laptop to recognize the StarTech enclosure even after multiple reboots.
After shutting it down, disconnecting from AC (and driving home) I found that the drive could be mounted but as soon as I started copying files to it, raid reset.
I'm going to try a restore back to stock OS (I've put the latest Win 10 creators release) and see if some driver update I've made is at fault.
05-09-2017 04:51 AM
So far, so good. I reset the BIOS and Windows and haven't put anything else on except for normal windows updates and a few app installs. Here's hoping it was something avoidable. I'll know more by the end of the day...
05-10-2017 06:07 AM
On the second day, he cried. And then the murders began.
[google the second sentence to find out the joke]
Unfortunately while using the machine yesterday I unplugged it and within 30 seconds had a bus reset. This time though there was nothing in the event logs. I repeated this three times during the day.
My guess now is this issue is the the infamous USB C peripheral issue that's well known to other people. This enclosure has a controller that isn't compatible with the 720 USB controller, or vice versa.
I transferred the SSD to a different enclosure (same manufacturer but different controller chipset) and the results are promising. I figure I'll have final results by the end of today.
05-17-2017 09:27 AM - edited 05-17-2017 09:28 AM
Well, I'm still seeing odd behavior but can't pin it down except as far as it's related to having a device connected to the lightning port.
If nothing is connected to USB C (but is connected to the other two USB 3 ports), there are no "resets" (I don't have a better word) and no odd events in the windows event viewer.
I'm waiting for a straight to USB C cable so that I can test the latest SSD enclosure
05-30-2017 10:55 AM
Hi, I'm curious if you have discovered any solution yet.
I have the same problem connecting an external monitor with HDMI cable via usb-c to HDMI adapter. I have tried 3 adapters, 2 different HDMI cables and two Yoga 720 laptops (returned the first one). The problem persists. I used the same monitor with another PC without any problems, so it§s not that either...
I'm curious that I haven't seen many other mentions of this problem so far. But having 2 "faulty" units just seems unlikely.
btw - mine is FHD, 12GB RAM, 512 SSD, Iron Grey version
05-30-2017 06:38 PM
Well, I ended up returning the vga/network "dock" and switched to using a StarTech usb3.1 SSD enclosure and the disconnects have stopped. I haven't found a "dock" that I've been willing to try again.
It sounds like the state of USB C is really bad and that's one of the reasons that Microsoft stayed away from it for the latest Surface refresh.
11-09-2018 02:03 AM
I have the same issue, with the external Samsung T5 ssd and the official usb-c dock from Lenovo, every 5 to 10 minutes or so the device disconnects and then reconnects instantly, when working with files from these devices it is almost unusable. Any known fix for this issue?