On Sat, 22 Sep 2001, Michael Zayats wrote:
<SNIP>
>
> it's true that lspci shows that both my video card and ethercard use IRQ
> 11.
>
> 2 questions:
>
> 1) theoretic: Why at all drm needs IRQ i.e. does AGP sends info back to
> the driver?
>
> 2) practical: AFAIK BIOS is in charge of setting IRQs, but the only
> thing my AWARD bios enables to set for each IRQ is whether it is
> Plug-n-Play or Reserved. How do I rearrange PCI cards IRQs?
Historically on what I thought used to be older motherboards the AGP slot
and the last PCI slot physically shares the same IRQ control line
(although in the strictist sense they are not IRQ at all, but we'll skim
over that) This can of course give rise to some rather interesting
problems when it comes to pushing the envelope on graphics hardware and
other PCI cards that my not be very friendly when sharing interrupts.
I found that out the hard way when I would get the most asine bug with my
SCSI controller where it would corrupt writes every 500 or so K by
tainting 3 or 4 bytes at a time every sustained write. Oddly enough I
never noticed it at first and it is a credit to the fs that I managed to
get away with it for so long, but when it came to burning CD images ....
;)
Of course I also had a plethora of problems with DRI and X as well until I
twigged what was going on and swapped the contoller out with a nicer more
IRQ friendly card ;)
just my fourpenneth.
--
===
"If you can keep your head when all about you are losing theirs... you're
missing something IMPORTANT!"
Rob. (prolly teefed tho')
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