An IRQ (interrupt request) is the process where a device triggers a hardware interrupt on a processor. When this happens, the processor stops (and saves) the current executing environment, and services the hardware's request. Furthermore, it is possible to prioritize these requests go service some ...

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Preference of COM2 vs COM1

I have a vague recollection from way back when that there was some kind of recommendation that one should connect ones modem to COM2 rather than any other COM port. I even more vaguelly recall that ...
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100 views

What is the range of the legacy IRQs supplied by the motherboard? [closed]

What is the range of the legacy IRQs supplied by the motherboard? Between what and what? One hard review for me. 1 to 15 0 to 14 0 to 15 1 to 8
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358 views

No irq handler for vector (irq -1)

I recently installed Centos 6.5, however, I am constantly flooded by messages like: Message from syslogd@localhost at May 18 15:38:34 ... kernel:do_IRQ: 0.123 No irq handler for vector (irq -1) I ...
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124 views

Bsod, irq_not_equal, can boot into safe mode

Windows 7 64 bit crashes to bsod, irq_not_equal. I can boot into safe mode but cannot uninstall programs. Error from repair computer on windows installation disc: Root cause found: Unspecified ...
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Clarify misunderstanding about USB hosts and IRQs

I have a long-suffering usb sound card (Creative X-Fi HD). Its manual said the following: Ensure that the headset/soundcard uses a USB Host that is on an individual IRQ slot. This means that no ...
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Frequent BSoD Windows 7

For the past week I have been getting BSoD on my Windows 7 home built PC. It's an old computer, I built it back in 2006 or 2007. I hadn't had trouble with it until now. I have BlueScreenView to ...
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1answer
307 views

How to change IRQ priorities on Ubuntu?

I'm trying to figure out how to change the IRQ priorities for devices on Ubuntu (the specific release I have is 11.10). I found this question and answer which says it can be done, but it appears to ...
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2answers
8k views

PS/2 vs USB keyboards: performance and energy consumption

As far as I know, PS/2 keyboards are interrupt driven, while USB are polled. Typically a PS/2 keyboard was assigned IRQ_1 on Windows. I'm no hardware expert, but at a first glance seems like the PS/2 ...
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2answers
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Computer architecture: Are USB keyboards less responsive due to narrow IRQ range?

Here is a statement I just thought of. Can anyone tell me whether, and why, it is true? Statement: Because USB keyboards rely on a USB generic driver and architecture that has only access to lower ...
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1answer
1k views

IRQ's & interrupt vector table

I have been reading a lot about IRQs, and it seems there is conflicting and out of date information. Some of it dating back to Windows 95. Here is what I'm confused about. Are both software ...
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807 views

How to fix hard lockups (mentioning some IRQ) in my Eeepc laptop (running Linux)?

My EeePC 1015PEM tends to block sometimes (approximately once per 2 days). Even _ cursor in (modesetted) text mode does not blink. After rebooting (unless battery and adaptor was removed) it shows the ...
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821 views

Serial port IRQ sharing on Linux

I was never able to use two serial ports for I/O on Linux that shared the same IRQ, although the serial driver has "IRQ sharing" enabled. Some BIOS simply don't have enough IRQs to give to each port, ...
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4answers
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IRQ problem with 2.6.32/2.6.39 kernel on Debian Squeeze x86_64

I recently assembled a new computer so that all hardware is pretty new. Since then I've been experiencing some problem with IRQs when running Debian 6.0. On random occasions, usually after an hour or ...
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1answer
55 views

Are IRQs registers?

When a device is assigned an IRQ, does that mean that it has sole access to certain registers associated with that IRQ?
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2answers
274 views

Can I use two of the same type of PCI Sound Cards in one computer?

I recently purchased two Rocketfish 5.1 PCI Sound Cards from Best Buy. These are going to be used for audio production and radio broadcasting, so one card can handle live audio, the other can handle ...
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1answer
552 views

Sound and Audio devices sharing IRQ numbers, high hardware interrupts, laggy video

After a fresh reinstall of Windows XP SP2, and re installation of my drivers from their official sites, my computer has been experiencing speed problems after a day or so of being on. After opening ...
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2answers
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System says memory controller not available and doesn't boot?

Recently I have had a MainBoard-problem. I've send my mainboard to service and today I got it back from the company. It is a Foxconn 520a mainboard. Now I have installed my exchanged mainboard. But ...