Bug 249930 - No C3/C4 sleep and high power consumption on thinkpad t43 with
Summary: No C3/C4 sleep and high power consumption on thinkpad t43 with
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
(Show other bugs)
Version: 7
Hardware: i686 Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2007-07-28 05:26 UTC by Leon Xu
Modified: 2008-01-10 17:17 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2008-01-10 17:17:33 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
dmesg info (24.32 KB, text/plain)
2007-07-28 05:26 UTC, Leon Xu
no flags Details

Description Leon Xu 2007-07-28 05:26:11 UTC
Description of problem:

CPU cannot enter C3/C4 sleep with kernel 2.6.22-1.27 and 2.6.22-1.33, and higher
battery power consumption reported by PowerTop: 2.6.22-1.33 at 18.1 watts vs.
2.6.21-1.3228 at 13.5w. Kernel 2.6.21-1.3228 has no this issue, and it run with
high percent C4 sleep and lower power consumption.

PowerTop output with kernel 2.6.22-1.33:

     PowerTOP version 1.7       (C) 2007 Intel Corporation

Cn          Avg residency (2s)          P-states (frequencies)
C0 (cpu running)        ( 3.9%)
C1                0.0ms ( 0.0%)
C2                8.5ms (96.1%)
C3                0.0ms ( 0.0%)
C4                0.0ms ( 0.0%)

Wakeups-from-idle per second : 113.0
Power usage (ACPI estimate): 18.1W (2.2 hours) 

Top causes for wakeups:
  53.3% ( 60.5)       <interrupt> : yenta, uhci_hcd:usb1, eth0, radeon@pci:0000:
   8.8% ( 10.0)     scim-launcher : schedule_timeout (process_timeout) 
   4.4% (  5.0)               tpb : do_nanosleep (hrtimer_wakeup)
   4.4% (  5.0)    gnome-terminal : schedule_timeout (process_timeout)
   4.0% (  4.5)              Xorg : do_setitimer (it_real_fn)
   3.5% (  4.0)       <interrupt> : libata 

Version-Release number of selected component (if applicable):
2.6.22-1.27 and later

How reproducible:
Thinkpad T43 run kernel 2.6.22-1.27 or later (powered by battery), check power
consumption with PowerTop.

Steps to Reproduce:
1. Update to kernel 2.6.22-1.27 or newer, and reboot to run the kernel
2. Turn off Wi-Fi, unplug any usb devices, unplug AC Adapter and run the laptop
powered by battery.
Actual results:
Battery (6 cells, 45 Wh) last time shorten about 50 minutes (3 hours to 2.2 hours)

Expected results:

Additional info:

Comment 1 Leon Xu 2007-07-28 05:26:12 UTC
Created attachment 160155 [details]
dmesg info

Comment 2 Christopher Brown 2007-09-21 12:14:14 UTC
Hello Leon,

I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the fedora kernel.


I am CC'ing myself to this bug and will try and assist you in resolving it if I can.

There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel?

If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.


Comment 3 Christopher Brown 2008-01-10 17:17:33 UTC
As indicated previously there has been no update on the progress of this bug
therefore I am closing it as INSUFFICIENT_DATA. Please re-open if the issue
still occurs for you and I will try to assist in its resolution. Thank you for
taking the time to report the initial bug.

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