On Sat, 15 Feb 2003, Jeff Mock wrote:
> In particular, the platform is a VIA mini-ITX motherboard that uses
> a VIA PLE133 combined northbridge and Trident Cyberblade graphics
> controller.
>
> VGAs have a legacy feature to generate a vertical blanking interrupt.
> I don't think windows or linux use this feature.
>
> I'm having trouble getting the vertical blanking interrupt to work.I'm
> a bit out of my depth with this thing, so be gentle.
>From my experience, many video chipsets are not VGA compatible in
this regard. If you have documentation for your chipset, maybe using
chipset specific code is preferable.
> Does anyone out there have experience getting VGA vertical blanking
> interrupts to work?Why would the VGA device not show up in the
> IRQ routing table?Is this a BIOS bug or are VGA interrupts just not
> supported by the hardware anymore?Any advice appreciated.
You can see code that implements vertical blanking interrupts in svgalib
(http://www.arava.co.il/matan/svgalib). This includes standard VGA, as
well support for a few chipsets. Unfortunately, it does not work on my
trident card.
-- Matan Ziv-Av. matan@svgalib.org- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Feb 15 2003 - 22:01:05 EST