linux-kernel - Re: [2/6] 2.6.21-rc2: known regressions

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Message-ID: <20070308192554.GA2999@elte.hu>
Date:	Thu, 8 Mar 2007 20:25:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Jeff Chua <jeff.chua.linux@...il.com>, pavel@...e.cz,
	linux-pm@...ts.osdl.org, lenb@...nel.org,
	linux-acpi@...r.kernel.org, luming.yu@...el.com,
	Arkadiusz Miskiewicz <arekm@...en.pl>,
	Konstantin Karasyov <konstantin.a.karasyov@...el.com>,
	Greg KH <greg@...ah.com>,
	linux-usb-devel@...ts.sourceforge.net,
	Thomas Meyer <thomas.mey@....de>, Meelis Roos <mroos@...ux.ee>,
	Alexey Starikovskiy <alexey.y.starikovskiy@...ux.intel.com>,
	Janosch Machowinski <jmachowinski@....de>,
	vladimir.p.lebedev@...el.com,
	Ash Milsted <thatistosayiseenem@...ab.com>,
	dmitry.torokhov@...il.com, linux-input@...ey.karlin.mff.cuni.cz,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [2/6] 2.6.21-rc2: known regressions


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > 2. First disk access after resume takes a couple of minutes
> >    (seemed instant with 2.6.20) during this time no new messages 
> >    show on console
> 
> Yeah, there is some problem with SATA resume. It would be beautiful if 
> the people who actually see this could narrow it down with bisection. 
> "It works for me" is clearly the case for many people, but not all.

Thomas found a new twist to this today: applying the patch below (which 
turns on ATA_DEBUG) made the SATA problem go away on his laptop. 
Michael, could you try this patch, does it change the behavior of your 
laptop in any way?

	Ingo

---
 include/linux/libata.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/include/linux/libata.h
===================================================================
--- linux.orig/include/linux/libata.h
+++ linux/include/linux/libata.h
@@ -51,7 +51,7 @@
  * compile-time options: to be removed as soon as all the drivers are
  * converted to the new debugging mechanism
  */
-#undef ATA_DEBUG		/* debugging output */
+#define ATA_DEBUG 1		/* debugging output */
 #undef ATA_VERBOSE_DEBUG	/* yet more debugging output */
 #undef ATA_IRQ_TRAP		/* define to ack screaming irqs */
 #undef ATA_NDEBUG		/* define to disable quick runtime checks */
-
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