BIOS - CSM setting changed

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  1. CountMike
    Posts : 19,518
    W11+W11 Developer Insider + Linux
       New #11

    biker66 said:
    the section in the mobo user's manual "BIOS - Peripherals" doesn't mention CSM nor the setting for Windows 8.
    Nothing to do with peripherals, look for it somewhere else.
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  3. Caledon Ken
    Posts : 30,189
    Windows 11 Pro x64 Version 23H2
       New #12

    I just posted your manual is missing stuff.

    You can look but I searched repeatedly with CRTL-F.

    You have to find a board similar to yours. The BIOS will be the same for these components. I downloaded several so I'm confident. CSM is the same even across manufactures.

    In one manual they even tell you the OS setting but I could find. On mine I set to other OS and I've seen that before.
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  4. Clintlgm
    Posts : 1,099
    Win 10 pro Upgraded from 8.1
       New #13

    biker66 said:
    I have set my BIOS to disable CSM support as i want my drive to be GPT not MBR. if i don't disable CSM in the BIOS then even if i set the drive to GPT using diskpart, Windows install will change it to MBR type without telling me! my mobo is a "Gigabyte GA-Z77X-UP5 TH". I had the BIOS setting for OS to "Windows 8 WHQL". there is no info in the guide book about this particular setting. the other options are "Windows 8" and "Other". then i set BIOS CSM to never. The problem i've had and this has happened more than once is that the BIOS OS setting changed from "Windows 8 WHQL" to "Other" & i think CSM was enabled. Has Windows 10 done this or the BIOS? maybe its a software or hardware fault with the BIOS? another problem i've had is that a SATA drive port i had set to disabled was re-enabled. sometimes this would result in new drive letters appearing.
    The first thing that comes to mind if BIOS setting are changing on there own is to replace the MB/BIOS Battery
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  6. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
    Thread Starter
       New #14

    i think the battery is a button type. CR2032 maybe. so it doesn't get recharged? mobo is about 3 years old.
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  7. Steve C
    Posts : 7,905
    Windows 11 Pro 64 bit
       New #15

    My mainboard is similar to yours. I have Windows 8 (not WHQL) set as as the OS, UEFI only boot and secure boot set on advice from Gigabyte. If are unsure send a support request to Gigabyte and they will advise what to do. Incidentally they just sent me today a new BIOS to defend against Spectre. Gigabyte have the BIOS but only issue it on request.
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  8. Caledon Ken
    Posts : 30,189
    Windows 11 Pro x64 Version 23H2
       New #16

    CR2032 is not a rechargeable battery. They generally last longer than three years, more like five or six. Of course as someone else says, your mileage may be different.

    For sure you can tell battery is shaky if you are requested to provide date and time to BIOS. It is done at that point.
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  9. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
    Thread Starter
       New #17

    Steve C, those are the settings i have: OS: Windows 8, UEFI only (CSM set to Never does that?), Secure boot enabled.
    I've loaded BIOS defaults then set OS to Windows 8, CSM set to Never. Secure boot is enabled by default.
    I also enable virtualisation as my CPU supports it though i've never had the need to use it yet.
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