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49 Posts

08-10-2011

Germany

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Re: T420s Fan noise Issue

2011-11-18, 8:29 AM

Hi 

 

My Powermanager shows diferent CPU loads but the Grafric is very bad. I prefear the Task-Manager from Windows.

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18 Posts

05-26-2011

Czech Republic

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Re: T420s Fan noise Issue

2011-11-18, 10:05 AM

@Jamez,

 

I tested BIOS release 1.30 on my T420s and have to say it is a step back. The previous release - 1.29 - worked much better for me (i5-2520M, Intel HD graphics) - fan rotation decreased together with decreasing CPU temperature and laptop was much quiter. It seems that setup in release 1.30 is a bit "aggresive" = any minimal increase of CPU temperature leads to significant increase of fan rotation. It is true that rotation goes down when CPU temperature drops but it isn't very nice to work on laptop with "oscilating" rotation.

 

Please let me know if you need something from me that may help engineers to fix it finally.

 

I have downgraded to 1.29 due to mentioned reasons.

 

Regards,

René

 

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143 Posts

11-15-2009

Stockholm

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Re: T420s Fan noise Issue

2011-11-19, 20:35 PM
My computer runs normally for a while, but once it gets up to the 4000 RPM mark, it just stays there. I usually can get it to ramp up the fan by watching a video on my computer.

If I reboot my computer and do nothing video related (e.g. word processing, Excel, emailing, etc) the fan will ramp up and down periodically but it never stays at 4000 RPM. But once you watch a video - it stays at the fast RPMs!
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49 Posts

08-10-2011

Germany

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Re: T420s Fan noise Issue

2011-11-19, 21:41 PM

I notice that with the new Bios the Fan drop from 4k to 3.5k just wenn the CPU is <45°C with the old one I think it was 50°C ? 

and now after a reboot it works normal as 1.29

 

 

Edit: or not :(

how ever, most of the time the fan comes only at 45°C back to 3.5k   there the 1.29 Bios is much better. I will test it a nother Day and then I change back to 1.29 

 

 

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1 Posts

11-20-2011

Sweden

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Betreff: T420s Fan noise Issue

2011-11-20, 10:39 AM
T420s - 4174P4G - BIOS 1.30
Windows 7 Enterprise (64-bit)
Intel HD Graphics - driver version 8.15.10.2509
NVIDIA NVS 4200M - driver version 8.17.12.7593
Power Manager - version 3.64
 
 Now perfect at my end, thanks!

Moderator edit: Masked serial to prevent misuse.
 
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49 Posts

08-10-2011

Germany

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Betreff: T420s Fan noise Issue

2011-11-20, 10:54 AM

Today my Computer works normal, no Idea wath it happend yesterday.

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15 Posts

06-17-2011

Copenhagen, Denmark

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Betreff: T420s Fan noise Issue

2011-11-20, 21:38 PM

Now it's been some days after upgrading to bios 1.30, and it's very weird, but after one or two days of thunder (i.e. non-stop 4K), suddenly my fan started to behave, staying quiet until temperatures reached approx. 45 c, and slowing down when they dropped below 40.

 

But today it's back to good old 4K. This can hardly have anything to do with room temperatures, since radiators have stayed the same as have outside temperatures - also, I've been using the machine for the same kind of (light) office work throughout. What else could cause these changes? I'm grasping at straws here (since Lenovo seem to do be doing the same), but could humidity play any role, e.g. by skewing the fan's temperature measuring or something like that? Although outside temperatures have stayed just about the same, the weather has been shifting from dry to humid and back.

 

Best, Sune

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143 Posts

11-15-2009

Stockholm

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Betreff: T420s Fan noise Issue

2011-11-21, 5:38 AM

If you guys watch a video (.mkv or .avi) file that is in 720p or 1080p, what happens?  That's the trigger that always gets my fan stuck at 4000k.

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49 Posts

08-10-2011

Germany

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Betreff: T420s Fan noise Issue

2011-11-21, 11:06 AM

Videos are no Problem, but wen I start the "Ful diacnostic Run" of my Intel SSd tool the fan gos to 4k (CPU tmp at 50-55°C) and only comes down with temp <45°C. After a schort Sdandby time /fan off) it wotks normal. (from 4k to 3.5k at 55°C)

 

Now I have the same Issue after running Kaspersky (max CPU temp 91°C) after this the fan drop only at temp. <45-50°C   I have no Idea wich is the reason for that behavior but sometimes it happend :(

 

 

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7 Posts

11-21-2011

Paris

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Betreff: T420s Fan noise Issue

2011-11-22, 9:29 AM

I upgraded the bios of my T420s to 1.30. My fan is stuck at 4000 rpm except during the five first minutes after power on, when the CPU temperature is less than 45°C.

I think I have another info : the processor (Core i5-2520M) is never less than 1.8 GHz.

 

I installed Linux openSUSE with the last kernel 3.1.

$ cat /proc/cpuinfo | grep MHz
cpu MHz        : 800.000
cpu MHz        : 800.000
cpu MHz        : 800.000
cpu MHz        : 800.000
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
2501000 2500000 2200000 2000000 1800000 1600000 1400000 1200000 1000000 800000
$ cat /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
2501000
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
800000

Everything seems OK. The governor asked the processor to switch to 800 MHz when idle. But with a root access, despite these informations, I see that the CPU is never under 1.8 GHz (the real frequency varies between 1.8GHz and 2.5GHz). Example:

$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
1800000

$ sudo cpupower -c 0-3 monitor

    |Nehalem                    || SandyBridge        || Mperf              || Idle_Stats                       
CPU | C3   | C6   | PC3  | PC6  || C7   | PC2  | PC7  || C0   | Cx   | Freq || POLL | C1-S | C3-S | C6-S | C7-S 
   0|  0,52|  0,00|  0,00|  0,00|| 83,50|  0,00|  0,00||  3,12| 96,88|  2050||  0,00|  2,22|  0,32|  0,00| 94,35
   1|  0,52|  0,00|  0,00|  0,00|| 83,50|  0,00|  0,00|| 10,67| 89,33|  1800||  8,44|  1,64|  0,55|  0,00| 87,14
   2|  2,95|  0,31|  0,00|  0,00|| 87,50|  0,00|  0,00||  2,10| 97,90|  1800||  0,00|  3,18|  2,74|  0,35| 91,66
   3|  2,95|  0,31|  0,00|  0,00|| 87,50|  0,00|  0,00||  2,22| 97,78|  1850||  0,00|  0,65|  0,90|  0,00| 96,24

This explains the constant overheating and therefore the fan noise.

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