I have a Lenovo T-580 Laptop with i5-8350U running Windows 10 build 1809 with latest drivers. The T580 has two USB-C ports. One is connected to a CSV-1550 MST hub, which is driving QHD and WUXGA 60Hz displays. The other USB-C is driving a 4k@60Hz display. Everything works fine after hitting the reset button on the MST hub, but there are a couple of problems.
1) When Windows turns off the displays after detecting inactivity, the MST won’t wakeup/resume. I press a key or shake the mouse to wake up the system and the 4k display wakes up, but the displays connected to the MST hub don’t turn on. I have a to hit the reset button on the MST to get them to turn on. How do I get MST to wake up/resume automatically?
2) After using the system for several hours, sometimes the MST monitors start flickering simultaneously (go blank for several seconds then come back). The 4k monitor stays on.
I used the same setup and cables from a loaner Lenovo Ultra Dock (40AJ), which uses the same USB-C ports and has a MST hub inside it and didn’t experience either of these problems.
The device manager shows an Unknown USB device (Device Descriptor Request Failed). I didn’t check to see if they unknown USB device was present.
Hello,
Could you send a screenshot of the device manager?
Wake up after sleep is windows based.
Please try the following.
1. Troubleshoot Power
Type troubleshoot in Cortana Search > Click Troubleshoot > Scroll down > Click Power > Run the troubleshooter > Follow on-screen direction.
2. Restore Default for Power Settings
Windows Key+i > System > Power & sleep > Click Additional power settings to open Power options > Click Change Plan Settings > Click Restore default settings for this plan
3. Disable Fast Startup
Reach to Power options as in previous step > Click Choose what the power buttons do > Click Change settings that are currently unavailable > Scroll down to Shutdown settings and uncheck Turn on fast startup > Click Save changes
4. Action for Battery Drivers
Windows Key+X > Device Manager > Expand Batteries > Right-click on first entry below
Disable device > Wait for 10 to 20 seconds > Enable device (you will need to do this for all entries one by one)
5. Also update your BIOS to latest from computer maker’s site.
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None of the steps helped. I performed steps 1 and 2. Fast start up in step 3 was already disabled, so nothing to do there. For step 5, I already have the latest BIOS installed from Dec 2019. I performed step 4 without rebooting. Is the reboot necessary?
Another problematic scenario I just discovered is the MST doesn’t wake up when I plug it in. I removed the laptop from my desk over the weekend and used it elsewhere. When I came back to my desk this morning and plugged in the MST and 4k monitor cables, the MST didn’t wake up. The 4k monitor did wake up. I had to hit the reset button on the MST to get it to turn on.
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The reboots didn’t help. Windows is up to date.
Hi,
according to the Lenove specs the USB-A port is always on. the same setup should be available for the USB-C port.
My guess there should be a possibility to turn this on for the USB-C port in the Bios of the laptop.
in conclusion this issue seems to be with the notebook not the CSV-1550, my advice is to contact Lenovo and ask for advice on how to keep the USB-C port in always on mode.
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