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Old 12-31-2005, 07:26 AM   #1
Registered: Dec 2005
Location: Edmonton
Distribution: BLFS, Gentoo
Posts: 353

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Question How to disable unused hardware ??

As of now, I'm running out of irqs as my console is dumped with message : "i8250: too much work for irq11". To work around this

problem I want to disable some of the hardware devices on my system which, I never use viz. Synaptics touchpad, network card,

memory card reader, PCMCIA...
I want to disable these devices to free up some irqs which would be assigned to other critical devices like my USB Maxtor drive

which right now is sharing irq11 with my graphics card, USB mouse, modem !
My question is how do I disable these unused devices and free up irqs and how do I automate this task via startup scripts ?
Another question is, would it be possible to manually assign irqs to devices or move around irqs so I get the optimum performance

oot of my system ? How acn I automate this task via startup scripts ?

Any input in this reagrd would be highly appreciated.
Old 12-31-2005, 02:28 PM   #2
LQ Sage
Registered: Nov 2004
Location: Saint Amant, Acadiana
Distribution: Gentoo ~amd64
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This kind of configuration is usually done from BIOS setup. Hottest candidates for disabling are legacy ports: serial and parallel - each of them takes one IRQ. Also set all PCI IRQ's to AUTO. Disable PnP OS support if you can - this forces BIOS to distribute hardware resources. Your actual options depend on what BIOS is used.
Old 01-01-2006, 11:08 PM   #3
Registered: Dec 2005
Location: Edmonton
Distribution: BLFS, Gentoo
Posts: 353

Original Poster
Rep: Reputation: 32
Forgot to mention about my BIOS. My machine is a laptop with Phoenix BIOS with just four options 1. configure the internal hard disk (LBA/CHS) 2. change the boot sequence 3. Set admin/user passwords 4. Save/Discard changes !!!!
I know I can't do it from the BIOS, that is why I posted this message. I know/heard of the possibility of disabling hardware from within linux but, I don't remember/know how to do that !
I have tried disabling hardware from within WinXP which did disable the unused hardware and did reduce the shared irq load a bit. Yet it didn't give me an option to change the assigned irqs. I know it is possible to do this in Linux if some one could help explain on this.

Thanks for your feedback !


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