Re: [LAU] setting up hardware priority

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To: Renato <rennabh@...>
Cc: linux-audio-user <linux-audio-user@...>
Date: Wednesday, August 17, 2011 - 12:38 pm

Renato wrote:

"Bus 001" = usb1

> Thanks Cedric, both these methods show which usb controller the device

UHCI/OHCI: USB 1.x only
EHCI: USB 2.0 only
xHCI: USB 1.x-3.0

(When Intel built the first EHCI controller chip, they intended for
it to support all speeds, but the USB 1.x part was too buggy, so they
dropped that part and added a separate UHCI controller and a switching
mechanism instead.)

> BTW is it possible to reassign IRQ somehow on a laptop?

No.

> As I said previously the IRQ 16 seems to be shared by the video card,

Interrupt sharing is a problem only when there are bad drivers that have
interrupt handlers that take too long.

In most cases this is not a problem because the only drivers known to
have this problem are those for USB and the closed-source ones for GPUs.

Regards,
Clemens
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Messages in current thread:
[LAU] setting up hardware priority, Renato, (Tue Aug 16, 12:39 pm)
Re: [LAU] setting up hardware priority, Clemens Ladisch, (Tue Aug 16, 3:34 pm)
Re: [LAU] setting up hardware priority, Renato, (Tue Aug 16, 3:56 pm)
Re: [LAU] setting up hardware priority, Cedric Roux, (Wed Aug 17, 7:59 am)
Re: [LAU] setting up hardware priority, Renato, (Wed Aug 17, 8:45 am)
Re: [LAU] setting up hardware priority, Clemens Ladisch, (Wed Aug 17, 12:38 pm)
Re: [LAU] setting up hardware priority, Cedric Roux, (Wed Aug 17, 9:04 am)