[laptop-mode] usbhid autosuspend

[Ritesh Raj Sarraf]

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On Saturday 25 Jul 2009 21:16:58 list at phuk.ath.cx wrote:
> I assumed there's no work being done on this atm, so I wrote a small
> patch that adds a driver blacklist to usb autosuspend. Tried to stick
> with the sh syntax, but I only have bash, so I couldn't test if it's
> truly sh compatible. It uses the readlink utility to read the "driver"
> symlink, but I guess readlink should be present on any linux system. I
> tested it on my system and it seems to work fine so far.


In the latest release (1.50) of laptop-mode-tools, usb-autosuspend can be=20
enabled in a LM/NOLM condition. So, this way, the power saving features for=
=20
the USB controller, is only enabled when switching to battery.

The problem really lies in the drivers that expose that they can suspend bu=
t=20
go haywire when triggered. Unfortunately the kernel devs feel them to be=20
broken hardware.

Thus I'm not very sure if we want a blacklist. There can be multiple usb=20
devices, served by the same driver, but with different behavior.

In 1.50, with LM/NOLM options, the problem can be minimized a lot.=20
So I would prefer getting the drivers fixed instead.

PS: With bash too, you can test scripts in sh mode. Just run the scripts wi=
th=20
"sh" as the program name. Example: "sh foo.sh"

Ritesh
=2D-=20
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."

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