SysFs

V4L2 specifications allow switching output and standard using IOCTLs. FBDev specifications allow
switching of resolutions at the output, but not the output itself. In the past, proprietary IOCTLs were added
in FBDev to allow output switching. Instead of abusing the FBDev interface with proprietary IOCTLs, it was
decided to remove this functionality from V4L2 and FBDev and implement the same functionality as a
SysFs driver attribute. This can be extended to support simple functions like enable/disable display,
control brightness, hue, etc. The LSP 2.00 DaVinci Video Sysfs User's Guide (SPRUG95)explains the
procedure to change the output and standard to work with the current display device.