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What's DOS?
Posts: 1
Registered: ‎09-15-2011
Location: Australia
Message 41 of 64 (2,909 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

Got the same problem! Can anyone could fix it up?
Appreciate your help. thanks in advance.
Punch Card
Posts: 35
Registered: ‎10-03-2009
Location: Atlanta
Message 42 of 64 (2,898 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

Not sure if you didnt read this entire thread but the temporary work around is to go into Bios and set the Graphics mode to DISCRETE and not Integrated or Optimus. 

 

As two posts back, Lenovo is testing a driver to fix this that could be released in mid October

 

Dixit

Lenovo Staff
Posts: 3,744
Registered: ‎07-11-2010
Location: Malaysia
Message 43 of 64 (2,803 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

@All,

There might be some delay on the drivers. Am pending the new schedule from the team. Sorry.

//JameZ
Paper Tape
Posts: 1
Registered: ‎10-03-2011
Location: NY
Message 44 of 64 (2,792 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

I am also having the same resolution issues as the others in this post.  I would appreciate it if a fix was implemented asap.

 

Thanks.

Lenovo Staff
Posts: 3,744
Registered: ‎07-11-2010
Location: Malaysia
Message 45 of 64 (2,766 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

@All,

ETA driver will be on 3rd week of Oct if no further bugs have been found during test stage.

//JameZ
Lenovo Staff
Posts: 3,744
Registered: ‎07-11-2010
Location: Malaysia
Message 46 of 64 (2,707 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

[ Edited ]

--------------------------------------------------------------------------------
CHANGES IN THIS RELEASE
  Versions 8.17.12.7593  (NVIDIA Graphics Driver)
           1.2.23.3      (NVIDIA HD Audio Driver)
           8.15.10.2321  (Intel Graphics Driver)

[Important updates]
  Nothing.

[New functions or enhancements]
  Nothing.

[Problem fixes]
- Fixed an issue where the external monitor that was supported up to 2560x1600
  was only set up to 2048x1536.
- Fixed an issue where Internet Explorer 9 (IE 9) might crash while loading some
  web pages. 

 

--------------------------------------------------------------------------------

 

Driver here 32bit

 

Text here

 

Driver here 64bit

 

Text here

Blue Screen Again
Posts: 11
Registered: ‎08-31-2011
Location: Shanghai
Message 47 of 64 (2,696 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

JameZ Sir,

The one you posted is for 32bit windows.  I tried and realize the installer doesn't tell you the driver did not install at all if you are running the 64bit version.

 

Went and downloaded the 64bit version from the Lenovo update download site.

I hope it works.

Blue Screen Again
Posts: 11
Registered: ‎08-31-2011
Location: Shanghai
Message 48 of 64 (2,690 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

The 64bit version installed and when switched to optimus mode in bios, I get a blank screen.  Only way to revert it is put it back to discrete.  Please advice.

Punch Card
Posts: 35
Registered: ‎10-03-2009
Location: Atlanta
Message 49 of 64 (2,679 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

I can confirm this works.  I just updated (had to go to Lenovos website, since the links you list are 32bit version, Im running 64bit OS) and switched it back to Optimus in the Bios, booted up.  I can finally use the native 2560x1600 resolution on my 30" Dell U3011 monitor and I believe Optimus is working since I also see the IntelHD graphics actived in the device manager.

 

One question I do have though.  Is this fix going to be ported into the Intel and Nvidia drivers (like directly from them two manufactures websites) or will we ALWAYS have to use this Lenovo version?

 

I ask because all the latest Nvidia drivers available now are Optimus compatible, one can manually install the IntelHD graphics driver from Intel's website and install the latest Nvidia Driver as well. 

 

Dixit

 

Lenovo Staff
Posts: 3,744
Registered: ‎07-11-2010
Location: Malaysia
Message 50 of 64 (2,669 Views)

Re: T420 - Unable to get max resolution of 2560x1600 via DisplayPort using Optimus video

@alxiqr,

Are you getting a blank screen on your external monitor with the laptop lid closed?

@Dixit,

Its recommended to use the Lenovo version since the Nvidia and Intel are packaged via engineering.

I am not sure if it would work if you download directly from Nvidia or Intel though.

//JameZ
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