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23 Posts

12-20-2014

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T460 and ULtra Dock Fail with Latest Intel 520 HD Graphics Driver

2019-03-10, 22:32 PM

My T460 had been working perfectly with the Ultra Dock and a 4K display, until I installed the new Intel 520 HD Graphics Driver in January. Since then the display will show vertical false color lines when connected through the DP on the dock. It also has random noise when connected using the HDMI port on the dock. The monitor works perfectly when connected to either the Mini DP or HDMI ports on the T460, itself. 

 

I have tested this with two other Ultra Docks to make sure it is not a dock issue. I also have two T460 laptops, and the one with the old driver, 23.xxxx, works but the one with the new driver, 25.20.100.6472, fails.  If I reinstall the driver it woks for an hour or so and then fails.

 

I cannot use the drivers from the Intel site since they say my driver is OEM specific. I need Lenovo to EITHER give me access to the previous driver OR fix the current driver.

 

 

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23 Posts

12-20-2014

US

32 Signins

242 Page Views

  • Posts: 23
  • Registered: ‎12-20-2014
  • Location: US
  • Views: 242
  • Message 2 of 5

Re: T460 and ULtra Dock Fail with Latest Intel 520 HD Graphics Driver

2019-03-11, 17:46 PM
Just talked to Lenovo service. They said they are only hardware, and this is a software problem. I called the umber they gave me and was told I would have to buy a $200 per year service plan to get the driver problem fixed.
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23 Posts

12-20-2014

US

32 Signins

242 Page Views

  • Posts: 23
  • Registered: ‎12-20-2014
  • Location: US
  • Views: 242
  • Message 3 of 5

Re: T460 and ULtra Dock Fail with Latest Intel 520 HD Graphics Driver

2019-03-11, 18:37 PM

I've just reinstalled the current driver and the DP on the dock works again. However, I did a similar reinatall three days ago and the DP on the dock failed within hours. So, some other driver may be messing with the Intel 520 driver.  I'll report back later on the stability of this "fix."

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23 Posts

12-20-2014

US

32 Signins

242 Page Views

  • Posts: 23
  • Registered: ‎12-20-2014
  • Location: US
  • Views: 242
  • Message 4 of 5

Re: T460 and ULtra Dock Fail with Latest Intel 520 HD Graphics Driver

2019-03-11, 21:25 PM

Well, the driver has failed again.  It seems to fail when the monitor come out of sleep mode.  But the driver has to be reinstalled to get it working again.

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23 Posts

12-20-2014

US

32 Signins

242 Page Views

  • Posts: 23
  • Registered: ‎12-20-2014
  • Location: US
  • Views: 242
  • Message 5 of 5

Re: T460 and ULtra Dock Fail with Latest Intel 520 HD Graphics Driver

2019-03-13, 22:26 PM

This issue has finally been resolved.

 

I contacted Lenovo Support by Twitter today. They were much more responsive than Lenovo Support by phone or chat. After some discussion about what I have tried so far, they sent me a link to an older Intel 520 HD Display driver. The readme file said it was 23.20.16.4836, the version I had before the driver update, and the version I requested, but the installed driver is 22.20.16.4836. In any case, it works for me, and the DP on the Ultra Dock now works again.  A big THANK YOU to Lenovo Support via Twitter. 

 

One thing that may be of interest to anyone else with this problem is that I could not install the older driver over the new one. Each time the dialog box said the older driver had been installed, but the 25.xxx version persisted like a bad guest. So, I first uninstalled the 25.xxx version, rebooted the T460 and then installed the 23.xxx version. (Yes, you can use the dock with an external display without any driver. It's not pretty but it works.) I had to reinstall my LG 4K monitor driver again after installing the older 520  diaplay drver, but that was easy.  All is now great!

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