Bug 11122
| Summary: | less power consumption after suspend to ram (HP Laptops) | ||
|---|---|---|---|
| Product: | Power Management | Reporter: | Daniel Würfel (daniel.wuerfel) |
| Component: | Hibernation/Suspend | Assignee: | Zhang Rui (rui.zhang) |
| Status: | CLOSED PATCH_ALREADY_AVAILABLE | ||
| Severity: | normal | CC: | acpi-bugzilla, lenb, mithrandir, rjw |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.25 (2.6.25-gentoo-r6) | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
|
Description
Daniel Würfel
2008-07-19 03:28:59 UTC
> Latest working kernel version:2.6.25 (2.6.25-gentoo-r6) > Earliest failing kernel version:2.6.23 I will assume that you accidentally reversed these and I'll mark it as a regression. I'll reassign the bug to acpi_power-sleep-wake@kernel-bugs.osdl.org also. Thanks for the report. On Saturday, 19 of July 2008, bugme-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=11122 > > > akpm@osdl.org changed: > > What |Removed |Added > ---------------------------------------------------------------------------- > AssignedTo|power- |acpi_power-sleep- > |management_other@kernel- |wake@kernel-bugs.osdl.org > |bugs.osdl.org | > Component|Hibernation/Suspend |Power-Sleep-Wake > Product|Power Management |ACPI > Regression|0 |1 > > > > > ------- Comment #1 from akpm@osdl.org 2008-07-19 04:16 ------- > > Latest working kernel version:2.6.25 (2.6.25-gentoo-r6) > > Earliest failing kernel version:2.6.23 > > I will assume that you accidentally reversed these and I'll mark it > as a regression. > > I'll reassign the bug to acpi_power-sleep-wake@kernel-bugs.osdl.org > also. Thanks for the report. Well, unfortunately I have no idea what to do to debug this. Daniel, what exactly do you do to measure the power usage? Am Samstag, den 19.07.2008, 04:34 -0700 schrieb bugme-daemon@bugzilla.kernel.org: > http://bugzilla.kernel.org/show_bug.cgi?id=11122 > > > > > > ------- Comment #2 from rjw@sisk.pl 2008-07-19 04:34 ------- > On Saturday, 19 of July 2008, bugme-daemon@bugzilla.kernel.org wrote: > > http://bugzilla.kernel.org/show_bug.cgi?id=11122 > > > > > > akpm@osdl.org changed: > > > > What |Removed |Added > > > ---------------------------------------------------------------------------- > > AssignedTo|power- |acpi_power-sleep- > > |management_other@kernel- |wake@kernel-bugs.osdl.org > > |bugs.osdl.org | > > Component|Hibernation/Suspend |Power-Sleep-Wake > > Product|Power Management |ACPI > > Regression|0 |1 > > > > > > > > > > ------- Comment #1 from akpm@osdl.org 2008-07-19 04:16 ------- > > > Latest working kernel version:2.6.25 (2.6.25-gentoo-r6) > > > Earliest failing kernel version:2.6.23 > > > > I will assume that you accidentally reversed these and I'll mark it > > as a regression. > > > > I'll reassign the bug to acpi_power-sleep-wake@kernel-bugs.osdl.org > > also. Thanks for the report. > > Well, unfortunately I have no idea what to do to debug this. > > Daniel, what exactly do you do to measure the power usage? > > Hi, thanks for your very fast reaction. Respect. Well, you can measure the power usage with powertop (you know the intel tool? -> http://www.lesswatts.org/projects/powertop/). This tool shows the power usage only if the laptop runs in the battery mode. Or you take a standard power analyzer (i dont know the exact name in english, it cost 10 €, you can plug it between an electrical device an the power socket) *** Bug 11124 has been marked as a duplicate of this bug. *** Well, I have a power analyzer, but unfortunately I can not reproduce it on 1. a HP 6530 laptop, which is Core 2 Duo + ICH9. 2. another GM965/ICH8 laptop, which is similar to HP 2510P. Thanks for your reply and tests. First i did a wrong entry filling out the bug report form. "Latest working kernel version" is not the kernel 2.6.25. The problem, i have discribed, you can find in this kernel(2.6.25) too. I apologize for this mistake. I wrote this in the duplicated "Bug 11124". What power usage you measure if you run your laptop in AC mode with the power analyzer (darkest backlight, idle desktop)? I measure 23 W after reboot or suspend to disk. After a suspend to ram the power usage reduce to 18 W (Yes,I know, you cannot compare an intel core2 duo laptop with an amd turion x2, but i'm interesting in.) Have you the possibility to test another laptop from an older series like 6530b (for example a 6510b or even a 6515b). I see, the 6530b seems to be a very new laptop. The 6515b and the 2510p seems to have an older BIOS. Pherhaps it is not a linux than a BIOS problem. I think, if i resume from s2r the BIOS will not be loaded. Only while resuming from suspend to disk or while rebooting the BIOS is loaded. *** Bug 11124 has been marked as a duplicate of this bug. *** Is there any difference about C-state/P-state time in powertop before/after a resume? No differences. Powertop tells me that C-States are not available (because powertop is an intel tool and i have an AMD Turion X2?) The P-States(frequences) are equal before/after S2R: 800 MHz 100% 1600 MHz 0% 1800 MHz 0% 1900 MHz 0% Good news. Today i tired the new kernel 2.6.27. With this kernel the laptops runs with the same low power usage after reboot or suspend2disk like after a suspend2ram. The tickless timer works too. For me the problem is fixed. What is the reason for the high power usage in 2.6.25 and the low usage in 2.6.27? i have no idea.
>1. boot linux on a 6715b -> high power
>2. initialize s2r
>3. resume from s2r -> low power usage
>4. initialize s2d and resume -> high power usage
this is really weird.
good news is that we have fixed this issue in 2.6.27.
in order to get the root cause of this issue, you can run git-bisect to see which commit fixes this problem.
cc rafael.
I am experiencing the same problem with a Dell Precision M65 and 2.6.31 kernel. There is nothing strange in dmesg output. Since I use s2ram frequently I don´t know with which kernel version this happened the first time for me. Jürgen |