> Typically one can assign an IRQ to the video card in the BIOS -- mine > has an option named "Video IRQ." Most video cards do not need them but > work fine if one is assigned. Mmm, but they don't turn up in /proc/interrupts (and in this case it doesn't mean the device is not working) and it is a waste of a critical resource if you don't need it (sharing is a stopgap measure and reserving IRQ's through the BIOS makes life harder on the assignment algo). IRQ's are not really an abundant resource on the typical x86 platform... If you can prevent trouble, do it.
> Some, for one reason or another, require an IRQ and won't work without > it (NVidia RIVA128 cards, for instance, tend to require one). Nope, I have a RIVA TNT128 (Diamond Viper V550) in my machine here at work. In fact, after Felix's problems I started analysing my BIOS settings (I "inherited" the machine with settings, no real tuning yet) and I disabled IRQ assignment to VGA. The card is obviously still working happily. That might change when I start playing videos or so, I don't know... Guy > On Mon, 2002-09-30 at 12:28, Guy.Bormann wrote: > > [snip : see other mail] > > > > > > cat /proc/interrupts shows no allocation to the video board (?). > > Shouldn't be a problem. AFAIK, graphics board are completely memory-mapped > > (through AGP, don't know about the Voodoo3, though) and don't need an PCI > > IRQ. This is not the problem. See my previous message on this subject... > > > > Guy
