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@@ -44,6 +44,26 @@ The names of the DRM leases will have the following pattern: So, for example, a DRM lease for the first LVDS device on the device `/dev/dri/card0` would be named `card0-LVDS-1`. +### Dynamic lease transfer + +When `drm-lease-manager` is started with the `-t` option, the +ownership of a leases resourses can be transfered from +one client to another. + +This allows the ownership of the leased resources to be transferred +without the display being closed and the screen blanking. +`drm-lease-manager` handles the timing of the tranfser and manages the +references to the DRM device, so that the last framebuffer of +the old client stays on screen until the new client presents its first frame. + +The transition can be completed without direct communication between the old +and new client applications, however, the client that the lease will be +transitioned *from* must be able to handle unexpected lease revokation. +Once the lease is revoked, all DRM API calls referring to the DRM +resources managed by the lease will fail with -ENOENT. The client +should be able to gracefully handle this condition by, for example, +pausing or shutting down its rendering operations. + ## Client API usage The libdmclient handles all communication with the DRM Lease Manager and provides file descriptors that |