Some T410 ThinkPads could exhibit symptoms whereby the screen appears 'dithered' even though it is in 32-bit color mode. It appears that this is a result of the hardware screen not displaying at the right color depth (number of discrete colors).
By this I mean that the gradient picture on this page http://www.lagom.nl/lcd-test/gradient.php has bands, whereas it should not - the discrete stepping should be inperceptible at 32-bit level. Also note how the boxes at http://www.lagom.nl/lcd-test/gradient.php change as the gamma level is changed in the Windows Display Calibration wizard.
A potentially related issue was reported on the T400 here (but on ATI hardware):
My configuration is Lenovo ThinkPad T410 2522-K4U with Windows 7 64-bit. This has an NVIDIA NVS 3100M.
The issue was solved with the June 23rd update "Thinkpad Video Features (NVIDIA Quadro NVS/FX) for Windows 7 64-bit", but the issues returned with a Windows Update June 24. Argh.
As an interim solution, re-installing the drivers from the Thinkvantage System Update cache worked, although it is now not consistent with the NVIDIA latest driver.
The installer is at C:\Program Files (x86)\Lenovo\System Update\session\6md636ww
(NOTE: version 18.104.22.16838 is the one you want)
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this problem has been mentioned in the forums several times:
using 22.214.171.12438 is not a solution at all since there is no CUDA and there are issues with Firefox/WebGL. i am very disappointed that lenovo is not able to push a proper update for their drivers within 9(!) months.
further my observations:
- using current nvidia drivers (eg. 275.50) does not fix the problem either
- problem does not occur on external monitor (connected via VGA or DP->DVI)
- i would not call this dithering as gradient banding is a more accurate term
//an admin may want to add the links to the references list.
This site is so messed up that even your link to the 126.96.36.19938 driver is now busted.
http://support.lenovo.com/en_US/downloads/detail.page?LegacyDocID=MIGR-75176 now points to the latest driver and it doesn't fix the banding issue.
Yeah, with redirected links everywhere this has been a huge pain in the butt.
I have the same problem on my T510 4313-CTO (non-Optimus 3100m; 1920x1080 screen), and through some Google-Fu I've found a way to install those old drivers. If you go to the following folder:
C:\Program Files (x86)\Lenovo\System Update\session\6md636ww
You'll find the 188.8.131.5238 driver setup which fixes the problem, and the other session folders have the setup for all the other versions. I don't know what is fixe in the newer ones but there's no way I am ever going to use a driver that doesn't do the dithering right. I'm not too happy about this at all as I've spent hours searching for a fix.
Same problem with my T410.
I found the version 184.108.40.20638 of the nvidia driver here:
Smooth gradients are finally back.
I have the same problem with T410 2522RT6 and Windows 7 64-bit!
The 6md636ww driver can be found here:
And the issue haven't been fixed until now!
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