linux-kernel - Re: suspend slow in 2.6.25-rc6 (was Re: Suspend and hibernation patchset against -rc6)

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Date:	Thu, 20 Mar 2008 18:50:44 +0300
From:	Alexey Starikovskiy <aystarik@...il.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
CC:	Pavel Machek <pavel@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	David Brownell <david-b@...bell.net>, Greg KH <greg@...ah.com>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: suspend slow in 2.6.25-rc6 (was Re: Suspend and hibernation patchset
 against -rc6)

Henrique de Moraes Holschuh wrote:
> On Wed, 19 Mar 2008, Pavel Machek wrote:
>   
>>     Also, for polling mode to work on Acers, we need
>>     to insert a delay.
>>     
>
> Can we, in the future, always trigger any such performance damaging "fixups"
> based on DMI white/black lists?  As a rule?
>   
Poll mode is not supposed to be entered on any non-broken HW.
The fact that it happens now with Thinkpads at suspend is a bug.
EC region should not be accessed with interrupts of GPEs disabled.
> This is not the first time I see a vendor push broken crap, and everyone
> else who did it right get the shaft, because people don't like to add
> quirks to common code.  We get performance enhancement features disabled,
> mdelays added...
>
> And for the do-as-windows-does crowd, they do it on vendorissued device
> drivers, which obviously don't hork everyone else's devices.  Our equivalent
> solution is to key things to DMI matches.   This is worth keeping in mind,
> because the ACPI subsystem seems to be a common target for such bad
> behaviour.
>
>   

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