Bug 6976

Summary:	S4: causes CPU to overheat - Thinkpad G41
Product:	ACPI	Reporter:	Steven Rostedt (rostedt)
Component:	Power-Sleep-Wake	Assignee:	acpi_power-sleep-wake
Status:	REJECTED INSUFFICIENT_DATA
Severity:	normal	CC:	acpi-bugzilla, bunk
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.18-rc2	Subsystem:
Regression:	---	Bisected commit-id:

Description Steven Rostedt 2006-08-08 19:32:06 UTC

Most recent kernel where this bug did not occur: N/A
Distribution: Debian
Hardware Environment: Thinkpad G41
Software Environment: Debian testing
Problem Description:

This has happened with both suspend2 and swsusp. If I suspend every night
instead of shutting down normally or leave my laptop running, the CPU starts to
become sensitive.  That is, it starts to overheat easily, producing "temperature
above threshold" warnings.  I'm not worried that my CPU will overheat since the
P4 is protected from it, but I'm worried about other components in my laptop
that are close to the CPU from being damaged.  Also it wastes more energy as
well as killing my battery.

If I shutdown and let my computer rest, it has no problems.  It is also fine if
I let my laptop run for days or months.

But if I start using suspend to disk, on startup the CPU runs hotter.  Normal
operation (after shutdown) it about 46C to 54C, after suspend it runs in the 60s
 and with some network traffic will go into the 70s and sometimes into the 80s.


Steps to reproduce:

Suspend to disk, resume.

I'll let my system cool down again, and then see if it does it on the first
resume or if it takes a few times to get it going.  But since I'm writing this
on my effected laptop, I will have to add a comment to say how long it takes to
cause a problem.

Comment 1 Luming Yu 2006-08-09 00:22:32 UTC

Please cat /sys/power/disk.
if it is "platform", please change it to "shutdown" mode, and report back any 
difference.

Comment 2 Steven Rostedt 2006-08-09 04:25:31 UTC

$ cat /sys/power/disk
shutdown

It's already in shutdown mode.

Comment 3 Len Brown 2006-08-09 22:48:22 UTC

i don't suppose that suspend to RAM works on this box
and behaves differently?

Comment 4 Steven Rostedt 2006-08-10 04:16:47 UTC

Sorry, suspand to ram works, but resume from ram does not :(

Comment 5 Alexey Starikovskiy 2006-08-22 03:00:58 UTC

could you try if "platform" in /sys/power/disk works?

Comment 6 Adrian Bunk 2006-10-24 19:37:16 UTC

Please reopen this bug if:
- it is still present in kernel 2.6.18 and
- you can provide the requested information.