Re: [Linux-fbdev-devel] [PATCH] rivafb sync polarity problem?

[Antonino D. <ad...@po...>]

On Sun, 2003-01-19 at 20:55, Fredrik Noring wrote:
> Hi,
> 
> It seems the mode below doesn't work with rivafb in Linux 2.4.21-pre2,
> the RGB (TV) screen fail to sync properly. (The equivalent modeline in
> XFree86 4.2 works.)
> 
>     mode "768x288"
>         geometry   768 288   768 288   32
>         timings    62500   120 80   20 2   54 2
>         hsync low
>         vsync low
>     endmode
> 

Ooops :-)  Sorry, I did not notice you were using 288 for your yres, so
62500 is just right.

How bad is the sync problem?  It's possible that your horizontal timings
is not divisible by 8?  Ie., your hsync_len is 54, but when it's written
to the register, it's just 48.  You might want to recalculate the
numbers so you use 54 or 56.

Tony