same IRQ for video and USB controller???

[luis]

trying to nail down what can cause the blue screens when I (safe) remove an
usb drive

Noticed in the devicd manager that the Radeon video card and the USB
controller have the same IRQ (16) --- in fact also a "ESS ES56& - PI Data
Fax modem" (which I have no clue how it showed up)

Is this ok? doesn't seem so... (perhaps it is what generates the
IRQL_not_less_or_equal)

I have auto assign in everything in the bios....
any idea what I should do please?

TIA again!
luis

(have an gygabyte 8inxp --- last bios they have)

 

[R. McCarty]

APM style HALs (Hardware Abstraction Layer) PC's use the
traditional IRQ mappings up to #15. Newer PCs have an APIC
chip that expands the IRQ Mapping up to 23. Interrupt Request
Lines are signaling methods for peripherals to get the attention
of the processor. There is a hierarchy to the mappings where a
certain # IRQ gets handled before others.
Using Windows XP it's not uncommon to have several devices
share an IRQ line. Only some older peripherals may have an
issue with IRQ sharing. Modern BIOS hands off configuration
of peripherals to Windows, so manual assignments in BIOS are
probably ignored.
The only effective way to separate sharing is by moving the
cards in the PCI Slots. Most all motherboards have slots that are
shared and one or two that have independent IRQ lines assigned
to them. Usually this is Slot #2 and #5. (But it varies by vendor).
Most times the Motherboard manual will have a chart showing
the IRQ to slot mappings.
I wouldn't ascribe the error message directly to IRQ sharing, it
could be an issue with drivers.

 

[Lil' Dave]

Noticed with a PC using an Award Bios, one year old PC.
If I disable PNP OS, I can see what irq(s) the USB controllers are alloted
by the bios. Else, does not show up, not revealed.

Don't forget the AGP slot may share an irq with slot 1 or 2, varies with PC.

If you get irq usage worked out at the bios level (sharing and non-sharing
hardware), windows can't screw it up.