It should be vblank->vcount. It is fixed in mga-2.5.20-tvout.gz
at ftp://platan.vc.cvut.cz/pub/linux/matrox-latest. Obviously
this patch does not apply to 2.4.x.
> The line in question (marked ****) reads from vblank->count
> which is zeroed by the memset and not changed since then. I
> believe it should be reading from vblank->vcount instead.
Yes.
> I'm sorry not to have checked whether this has been fixed; I
> found that some Matrox bugs were fixed since 2.4.18 in the
> 2.4.19 prerelease changelog, but my Internet connection is only
> a 56k modem so I can't afford to download either the prerelease
> patch or the latest development branch.
AFAIK it is not fixed even in latest 2.4.x prepatches.
> I'd also be interested to know if there's any documentation of
> the difference between VSYNC and VBLANK in the context of the
> fbdev code -- I haven't found any references in the kernel
> documentation, perhaps there's some resource online?
linux-fbdev.sourceforge.net maybe have some documentation.
I wrote implementation according to flags names...
Petr Vandrovec
vandrove@vc.cvut.cz
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