The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Problems? See this thread at archive.org.

    8150 Fn+1 help

    Discussion in 'Sager and Clevo' started by mountainlifter_k, Jun 20, 2011.

  1. mountainlifter_k

    mountainlifter_k Notebook Consultant

    Reputations:
    39
    Messages:
    177
    Likes Received:
    0
    Trophy Points:
    30
    I normally use the Fn+1 to max out my fans when i'm running some games because i live in a hot climate.

    But i noticed that while the fans are on Fn+1, every ten seconds the fans slow down (for just a fraction of a second) and then go to max again. This cycle keeps repeating. If you keep your palm near the vents, you can feel the air surge break for a fraction of a second; in fact you can hear it too.

    Is this abnormal? Is something wrong with the fans? how can check my fan speed?
     
    mountainlifter_k, Jun 20, 2011
    #1
  2. Electric Shock

    Electric Shock Notebook Evangelist

    Reputations:
    268
    Messages:
    670
    Likes Received:
    0
    Trophy Points:
    30
    Don't worry. This is normal and a side effect from the pulse width modulation nature of the fans.
     
    Electric Shock, Jun 20, 2011
    #2
  3. 4st3risk

    4st3risk Notebook Evangelist

    Reputations:
    92
    Messages:
    414
    Likes Received:
    0
    Trophy Points:
    30
    [​IMG]
     
    4st3risk, Jun 20, 2011
    #3
  4. mountainlifter_k

    mountainlifter_k Notebook Consultant

    Reputations:
    39
    Messages:
    177
    Likes Received:
    0
    Trophy Points:
    30
    guys, i understand PWM as i have even implemented a dc motor control system before. The duty cycle will be fixed at 100% when Fn+1 is pressed. These waveforms (in the pic in previous post) will be at speeds much faster than the motor can respond to and definitely much faster than the human senses can detect.

    So, I cannot understand how PWM theory explains this artifact. Perhaps i am overlooking something. Could you explain further?

    Or Could someone please check if they get this effect too on their 8150? its not a big problem; just a mild curiosity.
     
    mountainlifter_k, Jun 20, 2011
    #4
  5. Electric Shock

    Electric Shock Notebook Evangelist

    Reputations:
    268
    Messages:
    670
    Likes Received:
    0
    Trophy Points:
    30
    I'm sure we've had many posts about this before and everybody has this same pattern on the turbo'd fans. There is nothing wrong with yours. On mine, at about every 8 seconds, it drops off.
     
    Electric Shock, Jun 20, 2011
    #5
  6. Ktulu85

    Ktulu85 Notebook Evangelist

    Reputations:
    101
    Messages:
    350
    Likes Received:
    15
    Trophy Points:
    31
    Yep, although I do not use the Fn+1, as I do not see the need for it, I have tested it before.

    I experience the exact same effect. The fans are at full blast, but then slow for a few seconds periodically
     
    Ktulu85, Jun 20, 2011
    #6
  7. mountainlifter_k

    mountainlifter_k Notebook Consultant

    Reputations:
    39
    Messages:
    177
    Likes Received:
    0
    Trophy Points:
    30
    sorry if i Irked you too much. I persisted in finding out what this was only because I had a 'minor' problem earlier with this new sager 8150 and it ended up RMAing. It was buzzing noise from the headphone jack when the USB port next to it was in use.
    I RMAed because it was a nuisance and it ended up being "a bad USB board that would have failed later on" according to sager.

    ALso, i didnt know that threads for this had been made earlier.

    Thanks to everyone for confirming that they have the thing too.
     
    mountainlifter_k, Jun 20, 2011
    #7
  8. DemonRage

    DemonRage Notebook Enthusiast

    Reputations:
    0
    Messages:
    31
    Likes Received:
    0
    Trophy Points:
    15
    Same thing here. :)
     
    DemonRage, Jun 20, 2011
    #8