hard disc clicks (was: Re: test proposal: powertop!)

[Thorsten Leemhuis]

On 27.06.2008 22:43, Till Maas wrote:
> On Thu June 26 2008, Fulko Hew wrote:
> 
>>   - after suspend/resume - make sure DISK power saving settings don't
>> change
>>
>> ie.  on F8, I have to do:
>>
>>   hdparm -B 255 /dev/sda
>>
>> to eliminate the current 'click of ultimate demise' problem
>> with overly aggressive disk power management
>> (Unfortunately, I don't know where I can set-it/script-it
>> to run after a resume.)
> 
> This should not happen with F9, because there pm-utils restores the hd apm 
> settings after thaw/resume, here is a way described, how you can script it in 
> F8: https://bugzilla.redhat.com/show_bug.cgi?id=382061

Yeah, that works; thx for your work Till.

While at it: On my Dell Latitude D630 I still get the 'click of ultimate 
demise' problem in F9 if I forget to run "hdparm -B 255 /dev/sda" 
*once* after each proper boot. It seems the BIOS is the culprit as the 
default Power Management level for the hard disk seems to be 128; due to 
that afaics the heads are parked (and unparked) often if the machine is 
mostly idle for a few seconds. If seen this on other laptops as well.

Should we fix this properly in Fedora as the defaults for at least a few 
(maybe more) laptops are odd?

CU
knurd