08-05-2015 09:57 AM
I just installed the free Windows 10 upgrade on my Lenovo Ideapad p400 touch last night. I woke up this morning and booted up my computer, and everything was fine until I attempted to change the brightness. When I tried to do this, my screen went very dim, and now I can't adjust the brightness (and I can't read my screen well, either). Normally, I would install/reinstall the video driver in order to fix this problem (recommended for other users with similar issues), but I currently do not see a Windows 10 version of the driver I need on the Lenovo website.
I was wondering:
a) if/when a new driver would be available to install (if that's the recommended solution)
b) is there something else going on?
c) Windows 10 allows you to revert back to Windows 8.1 within the first month of use. Should I just do this?
d) Is the p400 touch capable of running Windows 10? Why or why not?
08-05-2015 10:37 AM - edited 08-05-2015 10:39 AM
If you look in this list -
P400 is not listed as a supported system. I doubt it will be supported in the future but you can always call and ask Lenovo directly.
Why it is going dim?
This is because of the Chipset or the Intel drivers.
What you can do to make it functional?
- Try uninstalling the chipset and Intel drivers --- Restart --- Let drivers install automatically and check.
These can be uninstalled from "Device Manager" and "Programs & Features" in Control Panel
- Revert back to windows 8.1 (This option may or may not work - Did not work on my system)
- Reset laptop to factory settings
08-05-2015 02:26 PM
Yo I also have this problem. It's pretty frustrating that the p400 won't be getting Windows10 support. Makes my laptop feel useless, even though it has very capable hardware. If someone out there kind find a good fix for us p400 users I would be elated.
08-07-2015 02:43 PM
As a work around, you can get your screen bright by restarting.
When the Lenovo logo comes up, before Windows 10 has booted, press the bright screen button to achieve desired brightness.
This obviously sucks but at least I can see my screen while looking for another solution. Hope this thread one day delivers a working solution. After a little research going back to windows 8 or even 7 aren't great solutions for me.
08-07-2015 04:34 PM - edited 08-07-2015 04:39 PM
My solution- reinstalled driver version 10.18.10.3277
This is what I did:
- I went to MS website. They say contact the vendors.
-I went to Intel and downloaded the latest driver for HD4000 for Win 10. Did not fix it. Intel says that the Intel Graphics card in the Z400 is a generic one and their Win 10 update may not fix it because of what Lenovo might have done in its design.
-I went to Lenovo. Z400 is NOT on their list to update to Win 10.
- In desperation, I reinstalled the driver that was on my laptop:
Computer Windows 8 OS C:
Intel Video Driver
Run set up and reinstall the driver. if you don't have that driver on your computer go to Leno Driver database for Z400 and get it. Hope that works. It worked for me. The Brightness function keys are working perfectly just as before.
08-08-2015 11:22 PM
Hello. I also have a Lenovo Ideapad p400 touch. Screen also went dim on me.
In Windows 8.1 just uninstalling graphic's driver worked. It was Control Panel, Device Manager and then Display Adapters. That doesn't work with Windows 10.
The other solution of rebooting and press the increase brightness key at the Lenovo logo somewhat works but it doesn't turn the brightness all the way up.
So I found this worked for me:
And just download and reinstall the old graphics driver for Windows 8. That finally got me back to maximum brightness.
08-10-2015 04:02 PM
It's been 5 days since i reinstalled intel's graphis driver. i have dim control now, but... Win 10 has a problem with the graphics driver that was written for win 8.1. everytime i wake up my laptop from sleep mode, win 10 tells me that the graphics driver failed but has recovered it. win 10 also hangs up sometimes when i wake up the laptop from a sleep mode, so we have a combination problem here: win 10 and the graphis driver from lenovo.
It is disappointing that Lenovo does not have any updates for Z400. My two Z400's are about 2-3 years old. If Lenovo has thrown the Z400 on the heap pile of "legacy" computers already and doesn't offer updates for drivers and such, my only conclusion is the next computers i purchase will be ASUS or Toshiba..
08-11-2015 08:36 AM - edited 08-11-2015 08:42 AM
Yup, as was said earlier the computers discussed in this thread are not on the supported list.
I also found this:
Here Lenovo says both the P400 Touch and the Z400 (among other models) are on a list where Lenovo recommends that owners of these models NOT upgrade to Windows 10.
08-11-2015 11:01 AM
Thanks for the info. Yeah, I'll probably roll back to Win 8.1, take Lenovo off my mailing list and look to ASUS or Toshiba for my next computer.