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Questions tagged [irq]

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 before others.

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What exactly is IRQL_NOT_LESS_OR_EQUAL?

What exactly is IRQL_NOT_LESS_OR_EQUAL? What is IRQL? What things use IRQL? Why does it need to be less or equal? What would cause it to not be less or equal? Why can't the OS recover from it not being less or equal? Does IRQL only affect…
Aaron Franke
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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 IRQ level(s), it cannot give the keyboard access to…
PPC
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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 not a hardware expert, but at a first glance it seems like the PS/2 keyboards are more efficient. So here are…
Mister Smith
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Manjaro no irq handler for vector

When booting and at shutdown my relatively fresh install of Manjaro (uname -r: 5.9.16-1-MANJARO) on my HP Spectre x360 Convertible 13-ac0XX I get a an error message: [ +0,000425] __common_interrupt: 0.108 No irq handler for vector I looked up a…
oelsardine
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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 Process Explorer when the computer seems slow, I…
user16500
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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 have tried multiple ways to solve,…
bknagy
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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 interrupts and hardware interrupts managed and…
rubixibuc
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4 answers

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 so of running I hear a beep and this shows up in…
MasterM
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why do i see the message "do_IRQ: 5.33 No irq handler for vector" on my dell xps 15 9550?

Every time I suspend/unsuspend my laptop (Dell XPS 15 9550) I see this kernel log: Message from syslogd@cruz-XPS-15-9550 at Sep 14 07:58:31 ... kernel:[ 725.565407] do_IRQ: 5.33 No irq handler for vector My CPU is Intel i7-6700HQ and I'm with…
morhook
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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 cue audio. After installing both cards, I get…
Eamon
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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 now I have a problem. My system boots until the…
Martin
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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 other devices in the PC can be sharing this…
abyss.7
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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 look at the dump files. I get some similarities but…
user2122059
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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, and devices don't work (for more than simple…
nlucas
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Why is my device IRQ not appearing?

I have an USB external audio interface that constantly throws BSoD with IRQL_NOT_LESS_OR_EQUAL when plugged in. (The vendor drivers are definitely to blame here, but they are unmaintained and I need this interface to work). I'm trying to check if…
Arthur Attout
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