Re: [AD] fbcon driver color depth

[Peter Wang <tjaden@xxxxxxxxxx>]

On 2007-01-06, Evert Glebbeek <eglebbk@xxxxxxxxxx> wrote:
> On Saturday 06 January 2007 00:23, Milan Mimica wrote:
> > > As an aside, does desktop_color_depth() return meaningful information 
> for 
> > > the fbcon driver? It probably could and should if it doesn't.
> > 
> > It doesn't. It is a system driver entry, I'm not sure how would that be 
> > implemented.
> 
> It shouldn't be impossible to add in principle (and I personally think it 
> should be added), but it'll be a bit tricky because the Linux system 
> driver os not specific for the fbcon graphics driver, but also has to deal 
> with the other drivers and we don't know what driver the user will want to 
> use.
> 
> What about the following:
> Assuming the fbcon driver is defined, add a function to the vtable that 
> returns the colour depth of the frame buffer (if present), but which fails 
> (returns 0) when fbdev cannot be used on the current machine.
> This can affect programs that attempt to use other console drivers, but I'm 
> not sure how big of a problem that is in practice. I do think it's the 
> only way...
> 
> Comments?

That sounds fine.  On the other hand, vesafb is a hack and we shouldn't
encourage its use ;-)

Peter