Re: [Linux-fbdev-devel] mode change policy

[Petr V. <VAN...@vc...>]

On 14 Jun 01 at 10:46, James Simmons wrote:
> > > They return a error instead. Also what is the policy for cards that can't
> > > change modes. Right now most drivers return a -EINVAL if they can't change
> > > a mode. Do we pass back the only mode the driver supports instead of
> > > returning a error? 
> > 
> > If your vesafb runs in 1280x1024x32, setting 800x600x8 must
> > succeed, but do nothing. 
> 
> So a userland app would assume the video mode is 800x600x8 since it worked
> and was passed back it. Of course the results on the screen would be
> totally wrong. Then how is a userland app to know what the real mode is?

No. fb_set_var must return 1280x1024x32... (argument to fb_set_var
is not const...). Of course I know no app which verifies what
fb_set_var really did - but it is another problem.
                                                Petr