Enum Probe 

#[non_exhaustive]
pub enum Probe {
    Force,
    Cached,
}

Whether to make the kernel ask the display again.

Not a free choice. A probe is a round trip to the sink over DDC or the DP aux channel: tens of milliseconds per connector, and on a sink in standby it can wake the panel. The cached answer costs nothing and is what the kernel last saw.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Force

Ask the display. What a listing wants, and what a hotplug wants: the cache is exactly what has just gone stale.

Cached

Take the kernel’s cached answer. What a loop wants, and anything running while a display might be asleep.

Trait Implementations

impl Clone for Probe

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Probe

impl Debug for Probe

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Probe

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Probe

impl PartialEq for Probe

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Probe