我有一台运行 Blackmagic Decklink 卡和 USB 屏幕的计算机。我遇到的问题是，有时会发生 irq 冲突，并且操作系统会禁用 irq16，而 Decklink 卡和 USB 屏幕都连接到该 irq16。如果我移除 DVI 电缆，服务器会发出“哔哔”声并出现此错误：
[ 557.103401] irq 16: nobody cared (try booting with the "irqpoll" option)
[ 557.103530] handlers:
[ 557.103584] [<ffffffffa000c2d9>] (usb_hdc_irq+0x0/0x74 [usbcore])
[ 557.103735] [<ffffffffa019e06e>] (blackmagic_isr+0x0/0x30 [blackmagic])
[ 557.103867] [<ffffffffa000c2d9>] Disabling IRQ #16
之后，USB 屏幕更新非常慢。之后，Decklink 卡表现得很奇怪。我觉得这一切都是因为拔掉 DVI 电缆而引起的，这很奇怪。
我已将 USB 屏幕移至另一个 USB 端口 ehci_usb3，当我收到错误时，只有 decklink 卡受到影响。
我正在运行带有自定义内核的 debian 6.0.4。我添加了一个允许写入 hidraw 设备的补丁。我在其他内核（如 ubuntu 10.04）上使用了相同的内核补丁，但出现了输入问题。我对 irq 了解不多，如果问题与内核或硬件有关，则可能是主板或 decklink 卡
这是我从 lspci 输出的：
00:00.0 Host bridge: Intel Corporation Sandy Bridge DRAM Controller (rev 09)
Subsystem: Intel Corporation Device 2000
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
00:01.0 PCI bridge: Intel Corporation Sandy Bridge PCI Express Root Port (rev 09) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
Memory behind bridge: fe400000-fe5fffff
Capabilities: [88] Subsystem: Intel Corporation Device 2000
Capabilities: [80] Power Management version 3
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [a0] Express Root Port (Slot+), MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [140] Root Complex Link
Kernel driver in use: pcieport
00:02.0 VGA compatible controller: Intel Corporation Sandy Bridge Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Device 2000
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04)
Subsystem: Intel Corporation Device 2000
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at fe729000 (64-bit, non-prefetchable) [size=16]
Capabilities: [50] Power Management version 3
Capabilities: [8c] MSI: Enable- Count=1/1 Maskable- 64bit+
00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network Connection (rev 05)
Subsystem: Intel Corporation Device 2000
Flags: bus master, fast devsel, latency 0, IRQ 27
Memory at fe700000 (32-bit, non-prefetchable) [size=128K]
Memory at fe728000 (32-bit, non-prefetchable) [size=4K]
I/O ports at f080 [size=32]
Capabilities: [c8] Power Management version 2
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [e0] PCI Advanced Features
Kernel driver in use: e1000e
00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 05) (prog-if 20 [EHCI])
Subsystem: Intel Corporation Device 2000
Flags: bus master, medium devsel, latency 0, IRQ 16
Memory at fe727000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd
00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 05)
Subsystem: Intel Corporation Device 2000
Flags: bus master, fast devsel, latency 0, IRQ 22
Memory at fe720000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [130] Root Complex Link
Kernel driver in use: HDA Intel
00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b5) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Intel Corporation Device 2000
Capabilities: [a0] Power Management version 2
Kernel driver in use: pcieport
00:1c.1 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 2 (rev b5) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
Memory behind bridge: fe600000-fe6fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Intel Corporation Device 2000
Capabilities: [a0] Power Management version 2
Kernel driver in use: pcieport
00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 05) (prog-if 20 [EHCI])
Subsystem: Intel Corporation Device 2000
Flags: bus master, medium devsel, latency 0, IRQ 23
Memory at fe726000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd
00:1f.0 ISA bridge: Intel Corporation Cougar Point LPC Controller (rev 05)
Subsystem: Intel Corporation Device 2000
Flags: bus master, medium devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
00:1f.2 SATA controller: Intel Corporation Cougar Point 6 port SATA AHCI Controller (rev 05) (prog-if 01 [AHCI 1.0])
Subsystem: Intel Corporation Device 2000
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 28
I/O ports at f0d0 [size=8]
I/O ports at f0c0 [size=4]
I/O ports at f0b0 [size=8]
I/O ports at f0a0 [size=4]
I/O ports at f060 [size=32]
Memory at fe725000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [70] Power Management version 3
Capabilities: [a8] SATA HBA v1.0
Capabilities: [b0] PCI Advanced Features
Kernel driver in use: ahci
00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 05)
Subsystem: Intel Corporation Device 2000
Flags: medium devsel, IRQ 18
Memory at fe724000 (64-bit, non-prefetchable) [size=256]
I/O ports at f040 [size=32]
Kernel driver in use: i801_smbus
01:00.0 Multimedia video controller: Blackmagic Design Device a11b
Subsystem: Blackmagic Design Device a11b
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fe500000 (32-bit, non-prefetchable) [size=1M]
Memory at fe400000 (64-bit, non-prefetchable) [size=1M]
Capabilities: [40] Power Management version 3
Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [58] Express Endpoint, MSI 00
Capabilities: [100] Device Serial Number 00-00-00-01-00-00-0a-35
Kernel driver in use: blackmagic_driver
03:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30)
Subsystem: Intel Corporation Device 2000
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at fe600000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [50] Power Management version 3
Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
Capabilities: [90] MSI-X: Enable- Count=8 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number ff-ff-ff-ff-ff-ff-ff-ff
Capabilities: [150] #18
Kernel driver in use: xhci_hcd
和/proc/interrupts：
CPU0 CPU1 CPU2 CPU3
0: 58 0 0 0 IO-APIC-edge timer
1: 2 0 0 0 IO-APIC-edge i8042
8: 1 0 0 0 IO-APIC-edge rtc0
9: 0 0 0 0 IO-APIC-fasteoi acpi
12: 4 0 0 0 IO-APIC-edge i8042
16: 200026 0 0 0 IO-APIC-fasteoi ehci_hcd:usb2, blackmagic0
17: 0 0 0 0 IO-APIC-fasteoi xhci_hcd:usb1
22: 334 0 0 0 IO-APIC-fasteoi HDA Intel
23: 2402840 0 0 0 IO-APIC-fasteoi ehci_hcd:usb3
27: 2400 0 0 0 PCI-MSI-edge eth0
28: 2424 0 0 0 PCI-MSI-edge ahci
NMI: 0 0 0 0 Non-maskable interrupts
LOC: 1213946 1031369 800145 621285 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 0 0 0 0 Performance monitoring interrupts
PND: 0 0 0 0 Performance pending work
RES: 21023 55637 30534 18820 Rescheduling interrupts
CAL: 66 67 89 92 Function call interrupts
TLB: 150716 125506 175584 150345 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 18 18 18 18 Machine check polls
ERR: 0
MIS: 0