I remain confused regarding why the Viliv won't support display rotation when the Cowon P5, which uses the same display driver, does. On both devices, HKEY_LOCAL_MACHINE/System/GDI/Drivers points to ddi_au1200lcd.dll for both Display and MainDisplay. On both devices, the DWORD values for Rotation are 0 in both HLKM/Drivers/Display/AU1200LCD and HKLM/Drivers/Display/AU1200LCD/Active.
(Don't know if the 0 means rotation disabled, or current display angle 0 degrees.
) The one difference: the Cowon has a Rotation subkey under HKLM/System/GDI
(with a DWORD value for Angle of 0
) while that subkey is missing on the Viliv. I tried adding this key on the Viliv and then resetting, but the display still won't rotate even though that added subkey was retained after reboot. It seems like I've covered hardware
(identical processor
), software
(identical driver
), and registry here; what's left to control display rotation?