The zoom buttons allow you to zoom in and out on the timeline for finer detail. The keyboard shortcuts for zoom in, out, and reset are +, -, and *. You can also select the timeline contents and drag them left or right. Whenever you hover over a device, all callbacks highlight in all phases.
Selecting a device produces a device Detail Pane that follows the timeline. It shows how much time was spent in each phase. The Device Detail pane gives the full name of the device and the total time all of its callbacks took to complete (suspend or resume). Each phase callback is scaled to its relative length, which shows where most of the time was spent at a glance. To see a tabular list of all the devices and their callback times, on the left side, select Device Detail. This is also useful in determining which devices have parent/child relationships.
If you used the -f option in the test run, the page includes a detailed call trace of all the registered device callbacks.
Note There is a huge amount of data (hundreds of megabytes) in a callback trace that may tax your browser. Your outputs may take time to load on screen. The call graph data displays beneath the detail pane and filters based on the device you selected.