Changing 945G GPU IRQ assignment
Hugo.Jacques at verint.com
Wed Sep 30 08:55:26 PDT 2009
I have an Intel 945G-based system on which I installed a custom board (qhal_host below) into the PCIe x16 slot.
I am running Linux 22.214.171.124, Xorg 1.6.0 and xf86-video-intel 2.7.0.
Is there a way to have the Integrated Graphics Controller (i915 at pci:0000:00:02.0 below) being assigned to an IRQ different than 16?
I am asking this because I want to debug an interrupt issue. At some point I get ~100000 interrupts a second on IRQ16 despite neither the qhal_host or the Intel GPU devices report the interrupt is theirs (through respective IIR registers).
Anybody heard of 945G issues when both the GPU and a card in the PCIe x16 slot are generating interrupts as the same time?
Thanks in advance.
0: 71 0 IO-APIC-edge timer
1: 2 0 IO-APIC-edge i8042
2: 0 0 XT-PIC-XT cascade
4: 10 0 IO-APIC-edge
9: 0 0 XT-PIC-XT acpi
14: 7882 0 IO-APIC-edge ide0
16: 8586 0 IO-APIC-fasteoi qhal_host,i915 at pci:0000:00:02.0
28: 5872 0 PCI-MSI-edge eth0
30: 0 0 PCI-MSI-edge ahci
NMI: 0 0 Non-maskable interrupts
LOC: 2170197 2053944 Local timer interrupts
RES: 754 957 Rescheduling interrupts
CAL: 35 22 Function call interrupts
TLB: 409 421 TLB shootdowns
TRM: 0 0 Thermal event interrupts
SPU: 0 0 Spurious interrupts
Hugo Jacques, ing.
Video Tech Leader
Video Intelligence Solutions
Verint Systems Inc.
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