Re: What's up with the Embedded Controller driver? [was Re: [ACPI] patched sms-cm acpi/ec.c to 2.6.11.5]

["François Valenduc" <fvalenduc-IWqWACnzNjyZIoH1IeqzKA@public.gmane.org>]

>>>
>>> it does NOT seem ok. after some more tests with the patch, I found 
>>> out that francois was right about most of the problems:
>>> * timeout on boot, just after the boot loader. this is very 
>>> confusing to me...
>>> * when I plug in the battery, it takes ages to show information 
>>> about it... more than 1 minute.
>>> * about the usb problems, apparently I wasn't affected.
>>>
>>> could you please tip us about what could be causing these delays? 
>>> especially the boot delay... it really puzzles my mind.
>>>
>>> regards,
>>> pedro venda.
>>>
>>>
>>
>> Concerning USB problems, I think it happens because I tried the patch 
>> with the 2.6.11 kernel. I have retried with the 2.6.11.5 and there 
>> are no more USB problems. But all the other problems remains. 
>> Concerning the timeout on boot, could it be caused by the 
>> acpi-dsdt-initrd patch made by Markus Gaugausch. Maybe we should try 
>> other ways to incorporate the DSDT to the kernel.
>> François Valenduc
>
>
> I doubt it is the DSDT patch; rather, it looks like something has gone 
> wrong in the embedded controller driver in going from 2.6.10 to 
> 2.6.11.  I've tried out a number of different ways of fixing ec event 
> handling, including my own spinlock kludge and Pedro's version of it, 
> and also a series of patches by Dmitry Torokhov; but all of them seem 
> to have problems with very sluggish EC response and/or EC timeouts 
> (indicated by "Handler for [EmbeddedControl] returned AE_TIME").
>
> Who currently maintains ec.c? And what exactly has been done to it 
> since 2.6.10?
>
> cheers,
>
> Rich
>
>
Just by curiosity I tried the DSDT patches without applying any patch on 
the ec.c file and I don't notice any problem yet. I choose for a static 
DSDT override and there doesn't seem to be any slowdown of my computer. 
If I have well understood I could see "Handler for [EmbeddedControl] 
returned AE_TIME" appearing in kernel messages but it doesn't appear. 
Maybe I am very lucky!

François


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