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AMD doesn't support Windows 8/8.1 anymore so no new drivers will be available besides what is published by AMD Support.
I would install the Toshiba Driver AMD Driver again in case it got corrupted and see it the problem continues. You can download the driver from Toshiba Support from here: SATELLITE L850 Support | Toshiba . Plus I would update any drivers to the latest from Toshiba even if it is 2 years old.
I would install first the Windows Qualified AMD Driver (2015) and see if it fixes your problem. If not then I would install the BETA (2016) driver.
If the 2015 driver works then you can try and install the BETA and see if it works correctly also.
Here is how to update your Laptop's AMD Driver correctly: Laptop graphics update...How to
Here kingfish explains how you can increase TDR in Windows Registry to see if it fixes the TDR error: Graphics driver stopped responding and has recovered....TDR fix
Here is a website that give tips on how to fix the TDR error if the above doesn't work: Fix: VIDEO_TDR_FAILURE (ATIKMPAG.SYS) IN WINDOWS 8.1/10 - Appuals.com
Don't download the recommended software from Appuals.com, it is a scam but the information is valid for troubleshooting.
hello, thank you for the big help. I just want to clarify you stated below that I must not download the recommended software? Do you mean the Catalyst software suite and Radeon software crimson edition beta? thank you
Appuals.com is a good website that offers good troubleshooting tips but they unfortunately recommend downloading a program called "Reimage Pro". Reimage Pro is basically a scam. That is what I meant by not downloading the recommended software from that link.
I'll edit my previous comment to make it clearer.
DO Download the AMD Drivers.
hello, Ok I understand now. by the way I've download and install first the AMD driver that comes from the toshiba website. I'll update you if I would still encounter the problem. if yes, maybe I would try to install the driver from AMD website. anyways. thank you for the help.