[Lenovo] Fix PSR screen issues with AMD graphics

Some recent Lenovo laptops come with displays theoretically supporting PSR (Panel Self Refresh) techology which supposedly would improve battery life.

On systems with AMD graphics, both the proprietary drivers and the ones packaged by Lenovo incorrectly implement support for it, leading to issues such as screen flickering, screen tearing and video stuttering.

The workaround is to force disable PSR in Windows registry, by opening regedit and looking for this entry:

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000

then modifying or creating a key DWORD 32 bit named DalPSRFeatureEnable with value 0

Afterwards simply reboot the system.

Even though in theory disabling PSR could lead to worse battery life and higher GPU temperatures, I have not seen noticeable differences after a month of use, naturally it might vary for others, therefore monitor your system to detect issues in case.

To reenable it, simply change the value to 1