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

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Date:	Wed, 19 Mar 2008 21:23:23 +0100
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"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)

Hi!

> > Ok, 7c0... is innocent. Reverting not only the mdelay, but also rest
> > of drivers/acpi/ec.c patch fixed the
> > "rc6-breaks-backlight-in-X-over-lid-close", good.
> 
> Can you clarify a bit?
> 
> Do you mean that the full revert of 2c81ce4 that already got committed is 
> sufficient for you, or do you need to totally undo everything we've done 
> to ec.c since -rc5, and thus also to revert the _other_ revert we did (in 
> 4af8e10a6c57e7292862bd1703712f0565c7e429)?

I did some more testing, and realized I was wrong. We need to totally
undo everything we've done to ec.c since -rc5... (that has small
sideffect of brightness up/down keys no longer working -- regression
since 2.6.24, but saves us from "backlight gone after
closing/reopening lid" which is _NASTY_ regression from 2.6.25-rc5).

ACPI sucks.

I.e. this patch:


Revert ec.c to 2.6.25-rc5 state:

* this fixes backlight after closing/reopening the lid while in X on
thinkpad x60

* unfortunately it breaks fn-home/end keyboard brightness control

Signed-off-by: Pavel Machek <pavel@...e.cz>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 7222a18..caf873c 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -943,7 +943,11 @@ int __init acpi_ec_ecdt_probe(void)
 		boot_ec->command_addr = ecdt_ptr->control.address;
 		boot_ec->data_addr = ecdt_ptr->data.address;
 		boot_ec->gpe = ecdt_ptr->gpe;
-		boot_ec->handle = ACPI_ROOT_OBJECT;
+		if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id,
+				&boot_ec->handle))) {
+			pr_info("Failed to locate handle for boot EC\n");
+			boot_ec->handle = ACPI_ROOT_OBJECT;
+		}
 	} else {
 		/* This workaround is needed only on some broken machines,
 		 * which require early EC, but fail to provide ECDT */

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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