Some notebook systems provide the EDID for the internal panel via the _DDC method in ACPI, instead of or in addition to providing the EDID via DDC on LVDS/eDP. Add a DRM helper to search for an ACP _DDC method under the ACPI namespace for each VGA/3D controller, and return the first EDID successfully retrieved via _DDC. Update the i915, nouveau, and radeon DRM-KMS drivers to fall back to retrieving the EDID via ACPI _DDC on notebook internal display panels after failing to retrieve an EDID via other means. This is useful for retrieving an internal panel's EDID both on hybrid graphics systems with muxed display output, when the display is muxed away, as well as on a small number of non-muxed and/or non-hybrid systems where ACPI _DDC is the only means of accessing the EDID for the internal panel. Daniel Dadap (4): drm: retrieve EDID via ACPI _DDC method i915: fall back to ACPI EDID retrieval nouveau: fall back to ACPI EDID retrieval radeon: fall back to ACPI EDID retrieval drivers/gpu/drm/drm_edid.c | 161 ++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp.c | 8 +- drivers/gpu/drm/i915/display/intel_lvds.c | 4 + drivers/gpu/drm/nouveau/nouveau_connector.c | 6 + drivers/gpu/drm/radeon/radeon_combios.c | 6 +- include/drm/drm_edid.h | 1 + 6 files changed, 182 insertions(+), 4 deletions(-) -- 2.18.4 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
