Re: [Linux-fbdev-devel] drm_fb_helper: Impossible to change video mode

[James S. <jsi...@in...>]

> > Yuck. See my other post about what fbdev really means in its historical
> > context. The struct fb_info really maps better to drm_crtc than to
> > drm_framebuffer. In fact take the case of the matrox fbdev driver. It
> > creates two framebuffer devices even tho it used one static framebuffer.
> > What the driver does is splits the framebuffer in two and assigned each
> > part to a CRTC.
> >
> 
> So you get the layering naturally. On fbset - fbev layer you can
> choose from the resolutions available in the current output setup, in
> kmset or whatever - drm layer you can set up the outputs, merge
> multiple outputs into single cloned fbdev or separate them, ..
> 
> It's obviously nice if you can set the resolution on all of fbcons,
> fbdev and drm layers but getting it work on at least one layer with
> proper propagation up and down also works. BTW I don't know any
> application which sets linux console (or xterm for that matter)
> resolution through the terminal API.

I agree. The mode setting should be done in one layer. Its a matter of 
doing the proper emulation of the fbdev layer.