Kernel Modesetting: Difference between revisions

Latest revision as of 14:02, 7 January 2023

This material needs expanding ...

Needs nVidia driver information

KMS (Kernel Mode Setting) allows setting the display resolution in kernel space instead of userspace. This allows setting native screen resolutions early in the system boot process and can reduce flickering, both when booting and when switching ttys.

Enabling KMS requires adding kms to the mkinitfs configuration by adding it to the features variable, e.g:

Contents of /etc/mkinitfs/mkinitfs.conf

features="keymap cryptsetup kms ata base ide scsi usb virtio ext4"

The relevant DRM module for the graphics card needs to be added to the kernel cmdline (e.g.: if your graphics card uses amdgpu, add modules=other-modules,amdgpu to the cmdline). Omitting this step will result in additional flickering (e.g.: early output will render at low resolution and the resolution will change when the module is later loaded).

The exact driver (and firmware) required will vary depending on the GPU being used. See the links below for further details.

nVidia

Todo: Find out how KMS works with nVidia drivers

@@ Line 1: / Line 1: @@
 {{Expand|Needs nVidia driver information}}
+{{TOC right}}
-'''KMS''' (Kernel [https://en.wikipedia.org/wiki/Mode%20setting Mode Setting]) allows setting the display resolution in kernel space instead of userspace. It allows setting native screen resolutions early in the startup process and can reduce flickering, both when booting up and when switching ttys.
+'''KMS''' (Kernel [https://en.wikipedia.org/wiki/Mode%20setting Mode Setting]) allows setting the display resolution in kernel space instead of userspace. This allows setting native screen resolutions early in the system boot process and can reduce flickering, both when booting and when switching ttys.
-; Intel
+Enabling KMS requires adding <code>kms</code> to the <code>mkinitfs</code> configuration by adding it to the <var>features</var> variable, e.g:
-: See [[Intel_Video#Kernel_Modesetting_(KMS)]]
-; Radeon
-: See [[Radeon_Video#Kernel_Modesetting_(KMS)]]
-; Nouveau
-: See [[Nouveau_Video#Kernel_Modesetting_(KMS)]]
-; nVidia
-: {{Todo|Find out how KMS works with nVidia drivers}}
-= =
+{{cat|/etc/mkinitfs/mkinitfs.conf|features{{=}}"keymap cryptsetup kms ata base ide scsi usb virtio ext4"}}
+The relevant DRM module for the graphics card needs to be added to the kernel cmdline (e.g.: if your graphics card uses <code>amdgpu</code>, add <code>modules=other-modules,amdgpu</code> to the cmdline). Omitting this step will result in additional flickering (e.g.: early output will render at low resolution and the resolution will change when the module is later loaded).
+The exact driver (and firmware) required will vary depending on the GPU being used. See the links below for further details.
+=== Intel ===
+See [[Intel_Video#Kernel_Modesetting_(KMS)]]
+=== AMD/Radeon ===
+See [[Radeon_Video#Kernel_Modesetting_(KMS)]]
+=== Nouveau ===
+See [[Nouveau_Video#Kernel_Modesetting_(KMS)]]
+=== nVidia ===
+{{Todo|Find out how KMS works with nVidia drivers}}
+=== See also ===
 * [https://wiki.archlinux.org/index.php/Kernel_mode_setting  Kernel mode setting] archlinux.org
 [[Category:Kernel]]