Messages in this thread | | | Date | Mon, 14 Jan 2008 00:30:48 -0500 | From | "Bryan Donlan" <> | Subject | Re: Is it possible to change IRQ for certain device? |
| |
On Jan 13, 2008 10:57 PM, Lee Revell <rlrevell@joe-job.com> wrote: > On Jan 11, 2008 11:57 AM, Jan Marek <linux@hazard.jcu.cz> 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.
| |