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From: "Bryan Donlan" <>
To: "Lee Revell" <>
Cc: "Jan Marek" <>,
	"linux-os (Dick Johnson)" <>,
	lkml <>
Subject: Re: Is it possible to change IRQ for certain device?
Date: Mon, 14 Jan 2008 00:30:48 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Jan 13, 2008 10:57 PM, Lee Revell <> wrote:
> On Jan 11, 2008 11:57 AM, Jan Marek <> wrote:
> > I suppose, that VGA card does not need unique IRQ, but programmers,
> > which wrote driver, want it. I can imagine, that VGA card have many
> > interrupts, especially in the OpenGL games, but I cannot assign unique
> > IRQ for VGA card at all :-(
> >
> > But thank you for advice: I will try to send e-mail to Gigabyte and ask
> > they, if it possible to do change in the BIOS.
> >
> > BTW: it is interesting: I had a Biostar TA690G motherboard and it behave
> > similar as Gigabyte: I cannnot assign unique IRQ to the external
> > graphics card... Chipsets of this motherboards are the same...
> >
> > I've tried to solve this problem by bought of new motherboard: Gigabyte
> > MA790FX-DS5. I will see, if this board will behave as previous board...
> Why is a shared IRQ a problem for you?  IRQ handlers are supposed to
> be fast enough that disabling an IRQ line for the duration of the
> handler execution should not be a problem even if the IRQ is shared.
> VGA interrupts in particular should only fire once per frame and only
> need to flip some bits to wake up any processes waiting on vsync.
> If you have issues with a shared VGA interrupt then the bug is that
> some IRQ handler runs for too long and should be deferring work to a
> bottom half.

Jan is apparently using the nvidia binary driver, so I doubt it will
be possible to fix the bug that prevents it from sharing IRQs.

  reply	other threads:[~2008-01-14  5:31 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-10 11:05 Is it possible to change IRQ for certain device? Jan Marek
2008-01-10 11:23 ` Andi Kleen
2008-01-10 14:01 ` linux-os (Dick Johnson)
2008-01-10 23:43   ` Len Brown
2008-01-11 16:57   ` Jan Marek
2008-01-14  3:57     ` Lee Revell
2008-01-14  5:30       ` Bryan Donlan [this message]
2008-01-14  6:04         ` Lee Revell
2008-01-15 21:33       ` Folkert van Heusden
     [not found] <fa.LwvfKOhzep/>
2008-01-11  5:18 ` Robert Hancock

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