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

[Ingo Molnar <mingo@elte.hu>]

* Linus Torvalds <torvalds@linux-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 */