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commit 3620f2f2f39e7870cf1a4fb2e34063a142f28716 sets the cid of ACPI video/dock/bay device and leaves the hid empty. As a result, "modalias" should export the cid for devices which don't have a hid. ACPI Video driver is not autoloaded with commit 3620f2f2f39e7870cf1a4fb2e34063a142f28716 applied. "cat /sys/.../device:03(acpi video bus)/modalias" shows nothing. ACPI Video driver is autoloaded after revert that commit. "cat /sys/.../LNXVIDEO:0x/modalias" shows "acpi:LNXVIDEO:" ACPI Video driver is autoloaded with commit 3620f2f2f39e7870cf1a4fb2e34063a142f28716 and this patch applied. "cat /sys/.../device:03(acpi video bus)/modalias" shows "acpi:LNXVIDEO:" Signed-off-by: Zhang Rui <rui.zhang@intel.com> Acked-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>