Comment # 4 on bug 1212947 from Thomas Zimmermann

Hi

(In reply to Michal Suchanek from comment #3)
> Note that /dev/fb* supports /sys/class/graphics/fb0/rotate, not aware of
> anything like that for DRM.

This interface depends on driver support and is not implemented by most
drivers.

> 
> That means that switching from FB to DRM interface is a regression for
> people using the kernel interface to tell the application how to rotate the
> output.
> 
> Because the kernel interface exists many applications do not have
> corresponding userspace option at all.

The correct interface for console rotation is
/sys/class/graphics/fbcon/{rotate,rotate_all}. These files will remain. The
implementation is directly in fbcon and does not depend on individual drivers.