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Since commit41b4b11da0("drm: Add valid clones check") setting the `possible_clones` values is a hard requirement for cloning. `vkms` supports cloning for writeback connectors in order to capture CRTC content, however that broke with said commit. Writeback connectors are created on a per-CRTC basis, thus mark every non-writeback connector that is compatible with a given CRTC as possible clone - and vice-versa. Using a default configuration, the corresponding `drm_info` output changes from: ├───Encoders │ ├───Encoder 0 │ │ ├───Object ID: 40 │ │ ├───Type: virtual │ │ ├───CRTCS: {0} │ │ └───Clones: {0} │ └───Encoder 1 │ ├───Object ID: 41 │ ├───Type: virtual │ ├───CRTCS: {0} │ └───Clones: {1} into: ├───Encoders │ ├───Encoder 0 │ │ ├───Object ID: 44 │ │ ├───Type: virtual │ │ ├───CRTCS: {0} │ │ └───Clones: {0, 1} │ └───Encoder 1 │ ├───Object ID: 50 │ ├───Type: virtual │ ├───CRTCS: {0} │ └───Clones: {0, 1} Fixes:dbd9d80c1b("drm/vkms: Add support for writeback") Signed-off-by: Robert Mader <robert.mader@collabora.com> Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com> Link: https://lore.kernel.org/r/20250718121442.490634-1-robert.mader@collabora.com [fixed Fixes line and changed to: to into: to avoid checkpatch warnings] Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>