Questions tagged [bios]

The Basic Input/Output System (BIOS) on an x86 PC is the firmware that performs the power-on self-test (POST) and initializes hardware.

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Is there a way to get the BIOS version from inside Linux?

I want to get the BIOS version from Linux without going directly to the BIOS. I mean, is there a way to get the BIOS version from inside Linux?
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38 votes
8 answers
153k views

Why is USB not working in Linux when it works in UEFI/BIOS?

For background I have just built a new machine with modern hardware including: AMD FX-8350 Gigabyte GA-990FXA-UD3 motherboard 16GB RAM NVidia GTX 650 Ti Kingston SSD Given that, I tried to install ...
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35 votes
2 answers
239k views

How to create a bootable Debian USB drive using Windows

I am running Windows 10 and am starting to learn how to boot from USB devices. I have a 16GB USB (USB 3.0) drive and I want to do the following: Make the 16GB USB drive run Debian Linux. Keep ...
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  • 453
30 votes
7 answers
57k views

How to dump BIOS data to a file

I want to dump the BIOS data of my laptop to a file. The only solution I found is the following command: dd if=/dev/mem bs=X skip=Y count=1 X and Y are different in suggested solutions by different ...
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20 votes
3 answers
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Is /dev/nvram dangerous to write to?

I found information that nvram is used for BIOS flashing/backup and that it contains some bios related data. Would cat /dev/random > /dev/nvram permanently brick computer? I'm quite tempted to type ...
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17 votes
1 answer
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How does the grub efi loader find the correct grub.cfg and boot directory?

As I understand it, the uefi bios loads grub.efi from the efi partition. This now loads a bunch of grub modules and the configuration file from the /boot directory. But how does grub find the correct ...
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16 votes
5 answers
100k views

Laptop boots directly to Ubuntu, can't access BIOS or Boot menu anymore

I'm running Laptop with single OS: UbuntuMATE 15.04 Beta1 64bit on Toshiba laptop Core i3. After burning "Elementary OS" on a live USB drive using UNetbootin, what happened is: -After reboot, laptop ...
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16 votes
10 answers
26k views

How to flash firmware under Linux in practice?

Well, I am feeling too old for jumping through several burning hoops to upgrade several firmwares via the usual vendor-specific way: Download some DOS tools, waste some time creating a (Free-)DOS boot ...
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11 votes
1 answer
18k views

Unable to shutdown Windows after installing GRUB

I've a Asus ROG laptop that came with Windows 8.1 preinstalled, I upgraded it to Windows 10 and then I wanted to install Bunsenlabs Linux as dual boot. The laptop was UEFI locked and it took me some ...
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10 votes
1 answer
42k views

How much speed difference for a tweaked bios versus uefi boot? [closed]

EFI can be faster, but that's not certain. The biggest speed difference is in hardware initialization early in the process. On my systems, this is a fraction of the total boot time, so a reduction ...
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8 votes
6 answers
3k views

Unmount /boot after booting

For some highly secure bastion VMs I'll implement soon, I am considering to unmount /boot after booting - among other measures of course. Will be mounted only for updating kernel. Testing this, no ...
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8 votes
1 answer
638 views

Does Linux still have to reside within the first XX cylinders of a HDD?

It's been a while since I last bothered with partitioning my hard drive, but now it's time again and I remember last time I did this there was a requirement to put the root partition (or only GRUB?) ...
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8 votes
2 answers
7k views

booting qemu/kvm directly from a file system

Having used Xen and its pygrub for a while, I'm now trying to do something similar with KVM/qemu. Basically, I have a LVM logical volume (though that could as well be a file) that contains the root ...
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7 votes
1 answer
659 views

Is there an open source software to simulate and virtually program a computer BIOS?

I’m looking for an open source software like Virtual-box that I can run on Linux but gives the possibility to program the BIOS (use a personal BIOS program). I want to understand (in a practical way) ...
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7 votes
2 answers
3k views

Total runtime of machine

Is there any way to read total running time of a linux system from BIOS or CPU? I've searched BIOS informations by dmidecode. But it gives release date which is not proper for my question. Then I've ...
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7 votes
3 answers
11k views

How to make grub work again after drive reassignment?

My config: opensuse 11.4, boot partition at pendrive and hard drives with partitions sda1, sda2, sdb1. Today I changed chassis for my computer, and by mistake I attached second drive to SATA 3 ...
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7 votes
2 answers
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Is there a command or method (other than RTFM) to determine if a system has a UEFI BIOS?

My inspiration for asking this is this other question on Ask Ubuntu. One reason I am asking is that I am just curious. I would like to know more about this for whatever value it might have in the ...
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7 votes
1 answer
2k views

how to create a bootable flash that can boot as both BIOS and UEFI?

I'm creating a bootable recovery flash and I was wondering how to create it so it can boot on both UEFI and BIOS systems? I'm experimenting with GRUB but I'm open to any other bootloader. ...
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7 votes
2 answers
4k views

kworker thread kacpid_notify/kacpid hogging 60-70% of CPU

I'm running Linux Mint, version 19 Tara. My battery life is really bad right now and my fan is always on because my computer is constantly at 70% CPU usage on this kworker thread. It's really starting ...
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7 votes
2 answers
5k views

Booting from install disk, no USB keyboard

I'm trying to install Arch Linux on a new system with a Gigabyte GA-Z87N-WIFI board. Although I can use the USB keyboard (and mouse) in the BIOS, the keyboard doesn't seem to work at all once I boot ...
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6 votes
1 answer
18k views

How to correctly configure Debian watchdog daemon for BIOS Watch Dog?

Supermicro main boards contain a BIOS feature named "Watch Dog Function". Having Debian 6.0.6 with kernel "Linux debian 2.6.32-5-amd64 #1 SMP" we did: Change BIOS "Watch Dog Function" from Disabled ...
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6 votes
3 answers
2k views

"Calgary: Unable to locate Rio Grande table in EBDA" <- what does this mean?

When I boot my system, I get the following message: [Sat Oct 26 20:34:25 2019] Calgary: detecting Calgary via BIOS EBDA area [Sat Oct 26 20:34:25 2019] Calgary: Unable to locate Rio Grande table in ...
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6 votes
1 answer
2k views

Boot FreeBSD in legacy mode on GPT disk

I am trying to install FreeBSD in legacy mode (BIOS) on a UEFI system, since I have an Intel Iris Graphics 6100, which is from Broadwell series and is not supported yet by the intel driver, so I want ...
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  • 143
5 votes
1 answer
38k views

BIOS / GPT: do we need a 'boot' flag? [duplicate]

On a BIOS-GPT system (i.e. no UEFI): I partition my disk this way: 1) 2MiB with the bios_grub flag 2) 1GiB ext2 for /boot 3) 30Gib ext4 for / for Gentoo. 4) the rest divided for other distros ...
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  • 433
5 votes
2 answers
8k views

How to install GNU/Linux on a Windows PC without the BIOS password?

I want to install a GNU/Linux based operating system on a computer with Windows preinstalled, but unfortunately, the BIOS is set to only boot from the harddisk, and there is no way to boot from ...
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  • 391
5 votes
1 answer
11k views

How to check if VT-X is enabled in BIOS?

How to check if VT-X is enabled in BIOS? I have vmx in CPU flags, and no access to the BIOS. (I need to install a KVM VM on RedHat Enterprise Linux 6.1).
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5 votes
2 answers
2k views

What is the relationship between COREBOOT and SEABIOS

I am interested in investing in hardware that supports libreboot, and I understand that it's a fork of coreboot with firmware blobs removed, however I do not understand what seabios is. I did some ...
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5 votes
3 answers
595 views

What software or drivers do I need to shut off to use `flashrom`?

I have backed myself into a corner with a new system I'm building. The current BIOS is completely broken (it locks up after drawing half the screen if you enter settings during POST, locks up if any ...
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5 votes
0 answers
1k views

Allowing GRUB to access network in BIOS mode

I want grub to fetch some configuration via tftp/http. Using efi I can do insmod efinet and net_ls_cards will list my network cards which I can configure and use. Using PXE in BIOS/legacy mode ...
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4 votes
1 answer
2k views

Multiple Linux distros break BIOS fan control?

I have a strange (and annoying) problem with my ASUS UX32LA notebook: I suspect that multiple Linux distros (Ubuntu 16.04 and newer major versions using the 4.18.0-17-generic kernel, plus Fedora 28 ...
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  • 95
4 votes
2 answers
8k views

Does BIOS read directly the bootloader or load it into RAM?

I'm trying to understand the very first steps of the boot process. The CPU read the BIOS It reads a fixed address instruction It will jump to the first BIOS instructions address It will execute the ...
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  • 2,087
4 votes
1 answer
402 views

updating BIOS without MS Windows (or a floppy drive)

I'm running Kubuntu 12.04. I need to update my motherboard BIOS. The Arch Linux Wiki says, "By far the easiest way to make a bootable FreeDOS USB Stick is using unetbootin." So I did that. Using ...
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4 votes
2 answers
141 views

Why can GRUB2 only remember 4 bits?

For fun and laziness, I've got 20 entries in my GRUB2 menu. To get to the bottom one quickly, I tap down-arrow a couple of times during the GRUB loading screen. I can press the key 15 times (+/- 1, ...
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4 votes
1 answer
2k views

Can I read settings in BIOS without restarting Ubuntu

Can I read my bios settings under Ubuntu without restarting? For example, I'd like to check the sleep settings in my BIOS, S3 (suspend) or S4 (hibernate). As of now, I can't hibernate, and am ...
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4 votes
3 answers
14k views

Installing Linux without UEFI

I have a old Dell Dimension 8400 whose motherboard does not have UEFI. I upgraded the RAM to 2 GB. Also, it does not have a CD drive anymore, so the only way to install an OS is through a flash ...
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4 votes
1 answer
671 views

Libre Coreboot payloads?

If one wishes to build an x86 server or workstation that is as de-blobbed and libre as possible, then the best one can do at this time is to use one of the fully free GNU/Linux distributions (...
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4 votes
1 answer
343 views

How to restore BIOS configuration access on Arch Linux?

I can no longer access the BIOS on my PC. I don't know what caused it, but it must have happened since I installed Arch Linux (my only OS) with UEFI GRUB. I have accessed the BIOS dozens of times ...
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4 votes
1 answer
1k views

GRUB menu does not appear after "Welcome to GRUB!" [closed]

The GRUB welcome message appears, and disappears after a moment, then there is a blank screen. However, it still responds to Ctrl+Alt+Del, in the same way as this question. My issue has all of the ...
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  • 161
4 votes
0 answers
2k views

Ubuntu boot fails on Lenovo P52 Thinkpad when hybrid display is set in BIOS [closed]

Booting to Ubuntu 12.04.5 LTS fails when the display is set to 'hybrid' in the BIOS (using Nvidia driver 415) When I switch to 'discrete', then it boots to Ubuntu OK. Because I am dual booting with ...
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4 votes
0 answers
1k views

UEFI-support for Debian Live-build

I'm building a custom Debian using live-build, and after dd-ing the iso to the USB-stick it boots fine on BIOS-computers, however it does not seem to support UEFI, thus not booting on newer computers. ...
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3 votes
1 answer
2k views

Network boot (PXE) from BIOS/EFI

What is the difference between these two loading schemas? PXE from BIOS. PXE from EFI. I know that firmware passes control to NIC program which is stored in the NIC ROM. This program gives IP ...
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3 votes
1 answer
878 views

Can I install using GPT on 32 bit system with bios?

All I search for this says, makes me understand that GPT is related to UEFI, but is it possible to install using GPT disk format, in a 32 bit system using bios (not legacy mode)? I tried installing ...
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  • 237
3 votes
2 answers
385 views

Lost everything after using install-mbr

I was dual booting Windows 8 and BackTrack5 but I erased the MBR while using easyBCD. So I tried this… sudo install-mbr -i n -p D -t 0 /dev/sda1 /dev/sda1 was the primary partition in my ...
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3 votes
3 answers
7k views

Dual Boot Help (Win10 and CentOS8)

Please help me guys. I'm losing my mind trying to dual boot my machine. Here is the specs of my machine: acer 4755g SSD for windows 10 and HDD for CentOS 8 (partition, not whole disk is used) ...
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3 votes
1 answer
904 views

Only half RAM memory available to linux in Legacy mode, UEFI shows full, why?

I have a problem with OS. All tools including kernel shows only half of my actual RAM memory. I have one 16G memory chip installed in my laptop and all is shown good in BIOS. Some info about ...
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  • 479
3 votes
1 answer
4k views

Is there a way to reset a bios password with a command prompt?

I bought a laptop recently with a unknown bios password that I need to reset. It is running pop os, I also do have access to the OS. I was wondering if there is any equivalent in Linux to the MS-DOS ...
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3 votes
1 answer
513 views

How to mitigate Meltdown and Spectre with firmware update

How does a firmware update help in mitigating Meltdown and Spectre vulnerabilities? Is it true that vendors are only releasing a firmware update for the windows platform? What about Linux? I ...
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  • 93
3 votes
1 answer
3k views

How do I boot my computer from a Live-DVD from the terminal?

I'm not an expert on computers in general or Linux in particular, so if I'm vague on something please let me know and I'll try to elaborate. I have an old computer running Red Hat 5.0. It had a ...
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3 votes
1 answer
863 views

How can I tell if I have a bug with my kernel or with my UEFI firmware?

I have a dz77ga-70k motherboard with version 0049 of the Intel firmware on it. Linux and elilo will not boot in uefi mode. The symptoms are that when I run bzImage.efi initrd=initrd.img ro debug ...
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3 votes
0 answers
2k views

Unable boot into Linux after BIOS update (dual boot machine)

My notebook has dual boot setup using UEFI mode. Windows 10 (installed by default) and Linux Mint 19.3. It was running ok until a new BIOS update made by Lenovo Vantage. After updating BIOS in Windows ...
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