Red Hat Bugzilla – Bug 249930
No C3/C4 sleep and high power consumption on thinkpad t43 with 126.96.36.199-27
Last modified: 2008-01-10 12:17:33 EST
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
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.
Battery (6 cells, 45 Wh) last time shorten about 50 minutes (3 hours to 2.2 hours)
Created attachment 160155 [details]
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.
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.