Not able to use secondary monitor with full resolution (Windows 10 64 Bit, Radeon Mobility HD 4650)
I have a Medion Akoya P8614 (MD 98470) laptop running Windows 10 64 Bit with an ATI/AMD Radeon Mobility HD 4650 graphics adapter. I want to extend the desktop via the VGA output to an external Packard Bell Viseo 240DX monitor with a resolution of 1920x1080. Initially, Windows only let me select a maximum resolution of 1600x1200 for the secondary monitor. After replacing the generic non-PNP monitor driver with the dedicated Viseo 240DX driver, I can now select a 1920x1080 resolution but only in 29Hz or 30Hz interlaced modes, which the monitor refuses to display with a "Frequency not supported" message.
I also tried to use the AMD tool (Radeon Software, previously Catalyst Control Center) to make the settings instead. However, the current version of Radeon Software does not support the Radeon 4000 Series any more. The last to support it apparently was Catalyst Control Center 13.1, which does not yet support Windows 10.
Note that the described setup works with full resolution with a different laptop, so the problem is not the monitor or the VGA cable.