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Thread: Laptop battery in or out??? [Resolved] |
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Thread Status: Active Total posts in this thread: 14
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gb009761
Master Cruncher Scotland Joined: Apr 6, 2005 Post Count: 2982 Status: Offline Project Badges: 
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A few days ago, I discovered to my amazement that, by running my laptop (a Lenovo T410) without it's battery in, the core temps went down by 25-30 degrees C - therefore, allowing them to run at 100% (as opposed to them being throttled back with it in). A little later though, I noticed that the timelength for completing WU's more than doubled. At first, I thought it was just a quirk and perhaps, there were a few longer WU's coming through or that my HDD need defragging/machine needed rebooting etc.
----------------------------------------After doing some basic checks and scanning my CPU benchmarks though, I've noticed that, by having the battery out, it has a serious knock-on effect though... CPU Benchmarks with the battery in (from a few weeks ago - the earliest I could find) 12-Sep-2011 07:09:58 [---] Running CPU benchmarks 12-Sep-2011 07:09:58 [---] Suspending computation - running CPU benchmarks 12-Sep-2011 07:09:58 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_00819617_target-7_0001_0 (left in memory) 12-Sep-2011 07:09:58 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_00819532_target-7_0001_0 (left in memory) 12-Sep-2011 07:09:58 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_00818712_target-7_0001_0 (left in memory) 12-Sep-2011 07:09:58 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_00818339_target-7_0000_0 (left in memory) 12-Sep-2011 07:10:30 [---] Benchmark results: 12-Sep-2011 07:10:30 [---] Number of CPUs: 4 12-Sep-2011 07:10:30 [---] 2899 floating point MIPS (Whetstone) per CPU 12-Sep-2011 07:10:30 [---] 7436 integer MIPS (Dhrystone) per CPU 12-Sep-2011 07:10:30 [---] [dcf] scaling all duration correction factors by 1.006433 12-Sep-2011 07:10:31 [---] Resuming computation CPU Benchmarks with the battery out 25-Oct-2011 11:56:19 [---] Running CPU benchmarks 25-Oct-2011 11:56:20 [---] Suspending computation - running CPU benchmarks 25-Oct-2011 11:56:20 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_01843729_target-7_0001_0 (left in memory) 25-Oct-2011 11:56:20 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_01842243_target-7_0000_0 (left in memory) 25-Oct-2011 11:56:20 [World Community Grid] [cpu_sched] Preempting oy459_00146_9 (left in memory) 25-Oct-2011 11:56:20 [World Community Grid] [cpu_sched] Preempting oy459_00140_9 (left in memory) 25-Oct-2011 11:56:51 [---] Benchmark results: 25-Oct-2011 11:56:51 [---] Number of CPUs: 4 25-Oct-2011 11:56:51 [---] 1028 floating point MIPS (Whetstone) per CPU 25-Oct-2011 11:56:51 [---] 2406 integer MIPS (Dhrystone) per CPU 25-Oct-2011 11:56:51 [---] [dcf] scaling all duration correction factors by 0.909447 25-Oct-2011 11:56:53 [---] Resuming computation CPU Benchmarks with the battery back in 25-Oct-2011 12:18:26 [---] Running CPU benchmarks 25-Oct-2011 12:18:27 [---] Suspending computation - running CPU benchmarks 25-Oct-2011 12:18:27 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_01843729_target-7_0001_0 (left in memory) 25-Oct-2011 12:18:27 [World Community Grid] [cpu_sched] Preempting HFCC_target-7_01842243_target-7_0000_0 (left in memory) 25-Oct-2011 12:18:27 [World Community Grid] [cpu_sched] Preempting oy459_00146_9 (left in memory) 25-Oct-2011 12:18:27 [World Community Grid] [cpu_sched] Preempting oy459_00140_9 (left in memory) 25-Oct-2011 12:18:57 [---] Benchmark results: 25-Oct-2011 12:18:57 [---] Number of CPUs: 4 25-Oct-2011 12:18:57 [---] 2842 floating point MIPS (Whetstone) per CPU 25-Oct-2011 12:18:57 [---] 7070 integer MIPS (Dhrystone) per CPU 25-Oct-2011 12:18:57 [---] [dcf] scaling all duration correction factors by 2.764885 25-Oct-2011 12:18:58 [---] Resuming computation Has anyone else seen this kind of behaviour before??? I, personally, would have just thought that a battery is simply a way of running a computer without the mains - and that it wouldn't have this kind of effect... Obviously, I was wrong...  [Edit 1 times, last edit by gb009761 at Oct 25, 2011 3:38:36 PM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Out! (once fully charged). It shortens life dramatically whilst crunching (due the constant elevated temps and charging). Crunching whilst charging also extends the time it takes to get full... after all, the PSU only delivers xx watts/amps (bought a heavy Hama too, to meet the high draw too). My laptop is on a cheap UPS, whilst the lithium ion battery is doing 160 Euro in replacement.
As for the benchmark, that could be the power saving features. Maybe your system goes into power save functions when it senses that the batt is in. That can be overriden in the Windows performance setting screen....mine is set to max. --//-- |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hello gb009761,
Your information is confusing, but if your computer speed is down it means that you have entered a low clock rate power-saving mode. Investigate that, then see what temperature you get at high speed. Sekerob is right. If your laptop is immobile and plugged in, removing the battery will conserve it and probably lower your laptop temperature. Lawrence |
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mikey
Veteran Cruncher Joined: May 10, 2009 Post Count: 822 Status: Offline Project Badges:
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Hello gb009761, Your information is confusing, but if your computer speed is down it means that you have entered a low clock rate power-saving mode. Investigate that, then see what temperature you get at high speed. Sekerob is right. If your laptop is immobile and plugged in, removing the battery will conserve it and probably lower your laptop temperature. Lawrence I have a 4 year old Dell laptop that has gone thru 2 batteries already and now crunches with the battery out to save the 3rd battery. I have not noticed what you are seeing so it is probably some setting somewhere realted to the power settings. It could eb in Windows, the laptops BIOS itself or perhaps even Boinc if you have it checked to not run while on batteries. Although that last one should stop the crunching not just slow it down!   |
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gb009761
Master Cruncher Scotland Joined: Apr 6, 2005 Post Count: 2982 Status: Offline Project Badges:
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Hi guys, thanks for your replies.
----------------------------------------I've just spent quite some considerable time checking/reviewing my settings, and as yet, I haven't found anything that may be causing this. Obviously, at all times, I'm crunching whilst on mains power, so, unless it is something in the BIOS that, when the battery is out, slows the computer down, I'm at a loss. I'll keep returning this this issue and trying various things out - but, in the meantime, I'd be interested in seeing/hearing from other Lenovo T410 owners in particular (and anyone else who may like to contribute), to see if their CPU benchmarks show a difference with and without the battery installed. I'm sure this must be something simple, but unfortunately, sometimes the simple things are the easiest to miss... |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hello gb009761
I also have a T410 and I can see the same behaviour..........have you found a way to get the performance up with the battery out? Thanks |
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gb009761
Master Cruncher Scotland Joined: Apr 6, 2005 Post Count: 2982 Status: Offline Project Badges:
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Thanks paulbrett - it's not just me then....
----------------------------------------As yet, no - although I'll keep coming back to this and trying different things out. Just this moment, I've started BOINC twice - once with and once without the battery installed, just to see if that gave any clues... it didn't - so I'm pretty certain that rules out BOINC (I was fairly confident that it wouldn't, but best to confirm). Obviously, I'm willing to accept/try out any suggestions anyone may have. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Actually, his problem is that the CPU runs slower with battery *in*. In W7 the behavior can be set under the config panel, energy management or whatever it's called in inglese. There are 3 options:
Energie saving High performance Custom (if you create your own profile). My laptop had to be hacked ** with a Vista driver since Sony would not support W7 for it. Now the little systray icon meter has the little red needle permanently at far right of the speedometer. ** Posted about this probably late 2009 or early 2010 when I hacked W7 on to incl. the Vista screendrivers, by NVidia, who would not supply new drivers..."refer to OEM was the message" :(. --//-- |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
I have just looked at CPU-Z and the CPU speed has dropped to 1.2Ghz but I have no idea what setting causes this......anyway we now know why the temps drop.
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gb009761
Master Cruncher Scotland Joined: Apr 6, 2005 Post Count: 2982 Status: Offline Project Badges:
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Hi SekeRob, I can confirm that my computer is set to run at Maximum Performance (it was one of the first things I changed, way back when I got the machine, and it's still set to this day).
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