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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-11 14:30:23 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-16 13:26:12 +0100 |
| commit | 9a758d8756daab5b8fda006e131c066336b16a32 (patch) | |
| tree | 453f3eeffd5bbd66a22124082738d9473b61f4ab /Documentation/admin-guide/kernel-parameters.txt | |
| parent | 27c3e9452d552ea86369a94f23287a9675f2d7a1 (diff) | |
| download | lwn-9a758d8756daab5b8fda006e131c066336b16a32.tar.gz lwn-9a758d8756daab5b8fda006e131c066336b16a32.zip | |
drm: Move nomodeset kernel parameter to drivers/video
Move the nomodeset kernel parameter to drivers/video to make it
available to non-DRM drivers. Adapt the interface, but keep the DRM
interface drm_firmware_drivers_only() to avoid churn within DRM. The
function should later be inlined into callers.
The parameter disables any DRM graphics driver that would replace a
driver for firmware-provided scanout buffers. It is an option to easily
fallback to basic graphics output if the hardware's native driver is
broken. Moving it to a more prominent location wil make it available
to fbdev as well.
v2:
* clarify the meaning of the nomodeset parameter (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221111133024.9897-2-tzimmermann@suse.de
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a465d5242774..88561b3ce28a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3777,12 +3777,15 @@ shutdown the other cpus. Instead use the REBOOT_VECTOR irq. - nomodeset Disable kernel modesetting. DRM drivers will not perform - display-mode changes or accelerated rendering. Only the - system framebuffer will be available for use if this was - set-up by the firmware or boot loader. - - Useful as fallback, or for testing and debugging. + nomodeset Disable kernel modesetting. Most systems' firmware + sets up a display mode and provides framebuffer memory + for output. With nomodeset, DRM and fbdev drivers will + not load if they could possibly displace the pre- + initialized output. Only the system framebuffer will + be available for use. The respective drivers will not + perform display-mode changes or accelerated rendering. + + Useful as error fallback, or for testing and debugging. nomodule Disable module load |