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what does 'nomodeset' do?

asked 2014-05-17 01:38:18 -0600

Daniel01 gravatar image

updated 2014-05-17 11:24:50 -0600

mether gravatar image

A few days ago I was trying to install fedora on my Acer Aspire V5-52G, my problem was that gnome was that "eating" CPU resources,eaven after updateig the system. However if I removed the "nomodest" parameter from boot,all is really fine.My question is what does "nomodeset" do and hoppfuly is not something bad that I removed it from the kernel parameters... is it ?

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answered 2014-05-17 03:42:48 -0600

Ahmad Samir gravatar image

The nomodeset boot parameter disables KMS (Kernel Mode Setting), have a look at this for more info: http://www.x.org/wiki/ModeSetting/

Nowadays, most open source graphics drivers in Linux require KMS and can't work without it; so for example if you have an intel graphics card and disable KMS the system will automatically fallback to the VESA driver, which is not as powerful/feature-full.

nomodeset is added to the boot parameters if you boot the installation media with the "basic graphics mode" boot entry; consequently nomodeset is added to the kernel command line in the installed system.

To remove nomodeset altogether you'll have to remove it from /boot/grub2/grub.cfg (if you have a UEFI system then it's /boot/efi/EFI/fedora/grub.cfg). And to ensure any subsequent runs of grub2-mkconfig don't add nomodeset back to grub.cfg you'll also need to edit /etc/default/grub (specifically the GRUB_CMDLINE_LINUX line).

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Asked: 2014-05-17 01:38:18 -0600

Seen: 11,359 times

Last updated: May 17 '14