Re: [Linux-fbdev-devel] Some questions

[Thomas W. <th...@wi...>]

Antonino Daplas wrote:
>>Ack. Is 16 fuzzy enough, what do you think?
> 
> 
> I think you should only accept modes where the difference is a fraction
> of a character width or height.  A difference more than that and
> clear_margins() will not work correctly.  

How do I - from a low level fb driver - determine the character size?

>>>I still believe though that scrolling should be determined by the
>>>driver, not fbcon.
>>
>>Well, what should I do now?
>>
>>The rivafb only forces y panning (ie sets yres_virtual to maximum) if 
>>yres_virtual is -1. This is never the case, as default var is constantly 
>>reused and I nowhere saw that any of the res_virtuals was set to -1.
>>
> 
> 
> For now, maximize yres_virtual, then set info->var.accel_flag to 1.

That's what I do.

(shifted boot screen)
 >>I am almost sure that this has to do with the fact that I adapt var in
 >>my check_var from 800x592 to 800x600. Console (or whoever) seems to
 >>attempt to change the mode to its initially desired dimension on many
 >>occasions.
 >
 > Strange.  If you boot at 800x600, the console will compute that as
 > 100x37.  On fbcon_resize, it will request 800x592 but because the
 > difference is only 8, fb_set_var should be skipped, so no mode change
 > should happen throughout.

But it definitely does. I can see this on my LCD (which goes dark during 
mode changes) and, of course, the log.

 > I have no idea.  I booted with other drivers at 800x600 and get no ill
 > effects.  I get a margin at the bottom of 8 pixels.
 >
 > How about checking what the offsets are during fb_pan_display()?

Done that. Nothing special; The penguin is where it should be, but the 
text below starts 8 lines too low.

Thomas

-- 
Thomas Winischhofer
Vienna/Austria
mailto:th...@wi...            http://www.winischhofer.net/