USB port is disabled using BIOS, I want to enable it


 
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# 1  
Old 04-16-2009
Data USB port is disabled using BIOS, I want to enable it

Hi,
I have PC with Linux OS RHEL3 and USB port is disabled from BIOS. BIOS access is protected using password. But, I have root access. Now, how can I enable USB port using root access? Is there any trick that I can do using root access that can enable USB port once my PC has booted up?
# 2  
Old 04-16-2009
I don't think so. Usually, a hardware device disabled in the BIOS isn't visible to the OS.
# 3  
Old 04-16-2009
It would mean fiddling with configuration bits at the chipset level. This sometimes happens in the linux kernel in quirks.c when it needs to do things like enable power management bits a manufacturer has ignorantly and obnoxiously left disabled. These bits are obscure and chipset-specific, often enough even motherboard-specific.

I don't know of a way to control these without rebuilding a kernel and rebooting into it, and in general, don't know how the bits themselves get set. I've just modified quirks.c to always think the motherboard's a known quirky model instead of checking its list. (which I had to do instead of adding to the known list of quirky models because compaq had also obnoxiously left out any PCI IDs that could uniquely identify the board!) But this was a specific thing for enabling a hidden smbus in a certain series of chipsets.

Last edited by Corona688; 04-16-2009 at 08:03 PM..
# 4  
Old 04-17-2009
hi gydave .
.well i couldnt figure out did u forget the password or was it disabled by the administrator ...well in case if u did forget it ..first switch off the computer and remove all power cables, your computer shouldnt be connected to any power source in any which way ..u will need a screw driver to open ur cpu cabinet and in there u will see a CMOS battery ....something like a big button cell (flat,circular,mettalic) ...it might be mounted horizontally or it might be mounted vertically depending on the motherboard ...u can remove the battery by a simple flick..the battery would come out easily or it might be fastened by some hinges .....remove the CMOS battery for about 120 seconds and place it back again the way it was put in .....restart the comp. try entering the bios ...the bios will give a warning stating all cmos settings not found ....u need to set the bios settings to default configuration settings ...system will now boot without bios password ....(P.S. DO THIS IF AND ONLY IF U KNOW YOUR WAY AROUND MOTHERBOARDS AND CPU CABINETS)
there is another solution around this ..there are several bios password cracking softwares ....but since these manipulate the bios i would advice "extreme caution" while using any software ....
 
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