On Tue, 22 Oct 2002, Tony Wu wrote:
> Does XFree86 video driver support VBlank(Vsync) interrupt? If it does,
> how to enable it?
XFree86 drivers are user-space drivers, and as such cannot
service interrupts. Only the kernel can handle interrupts.
Since most XFree86 drivers do not have a kernel component they
need to disable interrupts (because there's nothing to service them).
If you had a kernel module for your video card you could have
a device file that clients could use to do a non-spinning block until
the retrace.
Mark.
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