07-27-2014 12:18 PM - edited 07-27-2014 12:20 PM
Thinkpad T420 Intermittent Freezing / Lockup
My Thinkpad T420 keeps intermittently permanently freezing / locking up. However it seems that anything that uses hardware acceleration makes the system suddenly lockup. For instance, boot into Windows 7 and open Chrome Browser play a YouTube Video and it will lock up or enable the Windows Areo Theme and try looking at the event manager will also make the system permanently lock-up.
Here is the troubleshooting that I have tried so far:
The troubleshooting confirms that the problem is a hardware fault. So I logged a warranty call and explained that it was likely a fault with the System Board or the CPU. The engineer replaced the system board and the problem still remained.
So it look most likely that the integrated graphics seem to be causing the problem, especially when the system freezes when hardware acceleration is used. Has anyone else had a similar problem. I'm now waiting for the next plan of action form Lenovo. I did confirm the system freezing problem with Windows 7 and Mint 16 after the engineer replaced the system board and before he left. I'm still waiting on Lenovo getting back.
07-28-2014 06:40 PM
08-05-2014 04:56 PM - edited 08-05-2014 04:57 PM
Also I have the same problem.
The motherboard and memory have been replaced, the problems still persists.
Now the hard drive has bad sectors.
I also try in a new windows7 installation in another drive and the laptop get freeze.
Do same with Fedora in a new hard drive.
Still waiting for solution.
08-05-2014 09:02 PM
08-06-2014 12:48 AM
07-04-2018 09:04 AM
Well, the good news is that replacing the "integrated GPU" is trivial compared to replacing the motherboard so I am surprised that the technician chose the latter route. I have a T61 here with discrete NVIDIA GPU which has apparently managed to unsolder itself (a known problem for which the replacement program ran out years ago) and that's basically permanent. I can only use that one for parts any more.
Swapping out a Sandy Bridge CPU, in comparison, is child's play. Newer BIOS versions throttle the RAM speed to 1333MB/s (depending on the CPU, the GPU might otherwise access it faster). I have no idea whether this measure is related to the damage you have been experiencing.