T440p external display issues

Hi guys, I've recent got a new monitor and have been using a dual screen setup, with the external monitor primary, built in display secondary. I've found that if my displays go to sleep.. they do not wake wake back up. I simply have black screens and no response from the system. It might even lock up. The only way to resume is to do a hard reboot by full powering off then back on.

I've ready several users having a sort of similar issue, but with the ultradock + external displays - which can be referenced here:
T540p/T440p+UltraDock+external display issues - Lenovo Community

Has anyone experiences this, or something similar?
Anyone successfully using an external monitor with their T440p?

My setup:
T440p
i7 4700mq
Geforce 730m
Windows 8.1

I've installed the latest WHQL drivers from nvidia, latest intel chipset drivers via Lenovo update, and latest bios

Any input would be most appreciated.

 

I have this problem with my T440s and ultradock driving two external displays. Often the screens will not be triggered back on when resuming from sleep. If I unplug the power to the monitors they come back on. I have not had to reboot.

 

I think this is different than that Lenovo thread (I'm licoricepizza on it) that one is a problem with certain power adapters...

This sounds like an Intel display driver issue... I had this one a few times, but I haven't had it lately... Have you guys installed the latest Intel drivers?



Sent from thin my RM-820_nam_att_100 using Tapatalk

 

hey guys, thanks for the replies.
last night I installed the latest drivers from intel (which actually seem to be an older version of the driver that Windows 8.1 preloads - this caused some major issues with my system; checking the task manager I saw some major resources going to "system interrupts"

it took me forever to revert the display driver back. what I had to do was download the latest optimus driver from Lenovo. I ran the EXE, but rather than run the setup, I only let it extract the drivers (both Nvidia and Intel) to the /DRIVERS/WIN/VIDEO folder; then closed it. I wanted to use the latest Nvidia drivers, and only install the 4600 files. Then I updated the display adapter through the device manager and pointed to this folder.

this sort of seems to have solved the "system interrupts" issue a bit, but I still see it in my processes, just using fewer resources. I haven't had time to see if the system displays do not resume yet, but will report back.

currently using this intel display driver: 10.18.10.3345 (10/31/13) although I've noted on a previous install I had the 10.18.3355 (newer) but I have no idea where to find these, or how I had these installed before..

any idea what the noted "system interrupts" are - is this a normal process running in win 8.1 all?

thanks