Re: First row missing when using a monitor

On Wed, 17 Apr 2024 16:24:13 +0200
tuexen@freebsd.org wrote:

> > On 17. Apr 2024, at 15:11, Hugh Blemings <hugh@blemings.org> wrote:
> > 
> > Hi Michael, All,
> > 
> > On 17/4/2024 12:09, tuexen@freebsd.org wrote:  
> >> Dear all,
> >> 
> >> when using a monitor in combination with a Power9 system (raptor
> >> black bird), the top line is not displayed. I verified this when
> >> using top or vi. However, there is enough space on the monitor
> >> display let at the bottom to show one additional line below the
> >> lowest displayed one.
> >> 
> >> So it seems that the number of rows is correct, but when
> >> displaying them, they are off by one resulting in the first one
> >> not being visible.
> >> 
> >> This happens with the main branch.
> >> 
> >> Any idea what could be wrong?  
> > 
> > I'm curious - is this using the framebuffer in the BMC or a
> > separate video card ?  
> I have no video card installed.
> > 
> > I seem to recall the text console when using the BMC framebuffer
> > the display parameters are such that the top few lines to get
> > truncated.  It might be that some tweaks to the framebuffer scan
> > line settings could resolve this. Alas I no longer remember how
> > this is done.
> > 
> > Maybe this gives a next potential step though ?  
> Any idea which code to look at?
> 
> Best regards
> Michael
> > 
> > Cheers,
> > Hugh
> > 
> >   
> 
> 

You're probably using ofwfb, so the framebuffer configuration is likely
managed by the BMC, not by FreeBSD.  I recommend getting a cheap AMD
card, fewer headaches in general (still no acceleration, but at least
the AMD cards are well tested with FreeBSD); otherwise you can ask the
Raptor folks, who might have a clue.

- Justin