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Re: RFA: acpi-support -- glue layer for translating laptop buttons, plus legacy suspend support

Giacomo A. Catenazzi wrote:
> Michael Biebl wrote:
>> Roger Leigh wrote:
>>> On Mon, Apr 20, 2009 at 05:52:41PM +0200, Michael Biebl wrote:
>>>> Roger Leigh wrote:
>>>>> On Mon, Apr 20, 2009 at 03:55:15PM +0200, Michael Biebl wrote:
>>>>>> hal does not poll removable disks, it does though poll cd-rom drives for new
>>>>>> media and afaik there is no way around that if you want automount for cdrom
>>>>>> drives to work
>>>>> Spinning up the CD drive every 30 seconds is simply not an acceptable
>>>>> "solution".  If that's the best HAL can do, it should be disabled by
>>>>> default, and users will simply have to select the device by hand; we're
>>>>> only talking about automatic mounting here, after all.
>>>> First, polling the cd drive for new media should not spin it up. If it does it
>>>> is most likely a kernel/driver or firmware bug.
>>> So the bug is in a kernel driver, possibly.  But, it's still hal
>>> triggering the bug by the continual polling.
>>>> Second, you can very easily disable this behaviour: man hal-disable-polling
>>> Great, but it's still not the default behaviour.  Does every
>>> user need to find out how to disable it after they become sufficiently
>>> annoyed by the constant spinning up of their CD drive?
>> Why should *every* user need to find out? Seems to me as if you are exaggerating
>> in order to make a point. For the majority of users it just works, that's why it
>> is the default.
> powertop encourages to disable polling, so it is a big point.

I agree with you in general, but I doubt polling every 2 or 16 seconds will make
any significant difference power consumption wise.

> "Majority of users it just works", but how many of such user will use this feature?

How shall I answer that?
I know that I myself use auto-mounting extensively and also don't expect my
father to type someting like "mount /dev/hdc /mnt/cdrom"

> Is it really needed? 10-15 year ago hardware and kernel started to support
> "new media detection" on floppy disk (and IIRC on CD), so real hardware and kernel
> should support this sort of "hotplug", without polling, or I miss completely the
> issue?

See the hal-disable-polling man page. In short: hardware support for MMC media
change notification is broken.


Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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