[Bug 73154] video=LVDS-1:d ignored with !CONFIG_DRM_I915_FBDEV

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73154

--- Comment #1 from Jani Nikula <jani.nikula at intel.com> ---
The video= kernel parameter is handled by fbmem, which is queried for fb
options by drm fb helper. None of the drm fb helper functions get called by
i915 when CONFIG_DRM_I915_FBDEV=n, and thus the kernel parameter is ignored
altogether.

With CONFIG_DRM_I915_FBDEV=n you could configure CONFIG_DRM_KMS_FB_HELPER=n and
CONFIG_FB=n, AFAICT.

It sounds like you have an implied expectation that video= kernel parameter
should work regardless of CONFIG_DRM_I915_FBDEV when CONFIG_FB=y. (Or when both
that and CONFIG_DRM_KMS_FB_HELPER=y?)

Indeed, the bigger question seems to be who does the video= kernel parameter
belong to, really? Should it be made independent of FB, usable in DRM also when
all of the above mentioned configs are disabled? Definitely the drm fb helper
uses it for more than just FB. Or should DRM have a compatible drm.video=
module parameter instead?

Insights welcome.

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