If you have a notebook with Windows 10 that uses the AMD Radeon (Catalyst) graphics chipset, you may find that the default AMD video driver that is automatically installed by Windows does not support any brightness adjustment.
This means that the notebook battery will not last as long because it is always on full brightness.
This is a VERY common problem on Windows 10 notebooks with AMD graphics that have been re-installed, so you should always check that the brightness controls work after re-installing Windows or Windows drivers and for that matter, all the special control features (Fn keys, etc) on the notebook.
You can install the standard Microsoft Windows 10 VGA driver, but this reduces the maximum screen resolution (even though the brightness control does then work).
It turns out the solution is a simple registry fix.
This means that the notebook battery will not last as long because it is always on full brightness.
This is a VERY common problem on Windows 10 notebooks with AMD graphics that have been re-installed, so you should always check that the brightness controls work after re-installing Windows or Windows drivers and for that matter, all the special control features (Fn keys, etc) on the notebook.
You can install the standard Microsoft Windows 10 VGA driver, but this reduces the maximum screen resolution (even though the brightness control does then work).
It turns out the solution is a simple registry fix.