1. You may have noticed things look a little different around here - we've switched to a new platform (XenForo) and have some new forum styles and features. This how-to guide will help you find your way around. If you find anything that looks strange, post it in this thread.

what does "Video BIOS Shadowed" means?

Discussion in 'Alienware 17 and M17x' started by irkan, Dec 5, 2010.

Thread Status:
Not open for further replies.
  1. irkan

    irkan Notebook Consultant

    Reputations:
    41
    Messages:
    113
    Likes Received:
    0
    Trophy Points:
    30
    title says it all

    I get this phrase whenever i open my laptop "Video BIOS Shadowed" is it a good thing or a bad thing? and what is it technically?

    you can explain it in details np i can follow up :p

    thanx
     
  2. TurbodTalon

    TurbodTalon Notebook Virtuoso

    Reputations:
    1,372
    Messages:
    3,032
    Likes Received:
    111
    Trophy Points:
    131
    Everything I'm reading on the web about that is bad. Is your laptop booting up normally and everything, or is this before the OS boots?
     
  3. Harryboiyeye

    Harryboiyeye Notebook Deity

    Reputations:
    216
    Messages:
    718
    Likes Received:
    35
    Trophy Points:
    41
    I also get it as well when I'm booting and it's at the BIOS boot part.
     
  4. namaiki

    namaiki Super Moderator Super Moderator

    Reputations:
    3,862
    Messages:
    5,891
    Likes Received:
    20
    Trophy Points:
    206
    I believe it just means that a copy of the Video BIOS is stored in system RAM so that it can be accessed faster; not that I know when exactly it needs to be accessed, and I might be wrong.
     
  5. CptXabaras

    CptXabaras Notebook Deity

    Reputations:
    879
    Messages:
    1,135
    Likes Received:
    57
    Trophy Points:
    66
  6. dajohu

    dajohu Notebook Deity

    Reputations:
    408
    Messages:
    1,180
    Likes Received:
    130
    Trophy Points:
    81
    Lol, we don't have much choice, it's enabled by default and no way to change it in the BIOS. We ALL have both our system BIOS and video BIOS shadowed. During boot up you can pause the screen at just the right time you can catch it where it says it. Many times desktop BIOS's allow you to control it, but most modern laptops do not give you any control over it.
     

    Attached Files:

  7. irkan

    irkan Notebook Consultant

    Reputations:
    41
    Messages:
    113
    Likes Received:
    0
    Trophy Points:
    30
    thanx for the link rep+

    I am sure there should be a way to disable it.

    now thats the Video Bios (we know that best if its disabled unless you play doom on dos, Lol)

    what about the normal BIOS? is shadowing it worth doing?

    and if anyone wants to see where it says "Video Bios SHadowed" put your batteries one, and run your laptop without plugging the AC, you will see that the screen will stop and says "its better for you to plug in the AC bla bla for best performance " then you can see it.

    its important to note that before i installed the latest Dell VBIOS i didnt see this message (or did i?)

    edit: dajohu already put a screenshot of the message
     
  8. The0ne

    The0ne Notebook Consultant

    Reputations:
    37
    Messages:
    229
    Likes Received:
    0
    Trophy Points:
    30
    Shadowing is a old technique and if I remember correctly should not hinder any performance at all. I remember testing it quite a bit when it was first introduced and not noticing any impact whatsoever.

    I haven't read the article yet but I usually turn any type of shadowing off now. We've gone passed having to do that I think. :)
     
  9. irkan

    irkan Notebook Consultant

    Reputations:
    41
    Messages:
    113
    Likes Received:
    0
    Trophy Points:
    30
    any idea on how to do it in our machines? R2? (i.e. disabling shadowing)

    I have checked the advanced settings in the BIOS and i didnt find anything related to recaching / shadowing / etc ? let alone the VBIOS shadowing
     
  10. mtness

    mtness loitering

    Reputations:
    366
    Messages:
    1,612
    Likes Received:
    0
    Trophy Points:
    55
    does it really matter?...mine has said that since day one and it still runs flawlessly, i live by the moto "if it ain't broke don't fix it" :)
     
  11. irkan

    irkan Notebook Consultant

    Reputations:
    41
    Messages:
    113
    Likes Received:
    0
    Trophy Points:
    30
    it does matter because while searching on it some people indicated that turning it off might be better, so why it is enabled? doesnt hurt to know alittle more about our laptop :)

    i have found some interesting discussion at some forum "Video BIOS Shadow" Enable or Disable? - AnandTech Forums

    "Peter" who says that he is a "BIOS engineer" says it does not matter wither the option is turned off or on because its going to be ON anyways, ... but then again this discussion was in 2002, almost 9 years from now ...
     
  12. Elkay

    Elkay Notebook Deity

    Reputations:
    144
    Messages:
    756
    Likes Received:
    0
    Trophy Points:
    30
    BIOS shadowing copies very slow access ROM data into very quick access RAM and used to give a *huge* improvement in performance back in the day (x86, P1, P2 days). I hadn't really heard about it since then. I'd assumed that ROM technology had reached a point that it was no longer necessary, but perhaps the opposite was true and that since RAM has become so abundant, they just always default shadowing to "on" now. Thinking about it more, the latter is more likely the case.

    Regardless, I wouldn't stress too much over it. If it's copied to RAM, it definitely won't be slower than it just being accessed in ROM. Also, you're talking about a very small amount of data, around 4.5MB. The system BIOS is about 4.3MB and the VBIOS is 128KB. When you're talking about most of our machines having 4GB, mine having 8GB, 4.5MB is nothing to lose sleep over, especially if it's actually helping performance still.
     
Similar Threads: does Video
Forum Title Date
Alienware 17 and M17x Audio output doesn't switch when headphones are connected/disconnected? Dec 20, 2014
Alienware 17 and M17x Does it do for my alienware m17 r4? Dec 5, 2014
Alienware 17 and M17x Why does my new AW17 beep Nov 30, 2014
Alienware 17 and M17x GPU fans doesnt stop spinning Nov 22, 2014
Alienware 17 and M17x M17x R4 doesn't boot when nVIDIA GPU is switched on Oct 21, 2014

Thread Status:
Not open for further replies.

Share This Page