Solid::PowerManagement Namespace Reference

Enumerations
enum	SleepState { StandbyState = 1, SuspendState = 2, HibernateState = 4, HybridSuspendState = 8 }

Functions
bool	appShouldConserveResources ()
int	beginSuppressingScreenPowerManagement (const QString &reason=QString())
int	beginSuppressingSleep (const QString &reason=QString())
Notifier *	notifier ()
void	requestSleep (SleepState state, QObject *receiver, const char *member)
bool	stopSuppressingScreenPowerManagement (int cookie)
bool	stopSuppressingSleep (int cookie)
QSet< SleepState >	supportedSleepStates ()

Detailed Description

This namespace allows to query the underlying system to obtain information about the hardware available.

It is the single entry point for power management. Applications should use it to control or query the power management features of the system.

Note that it's implemented as a singleton and encapsulates the backend logic.

Author

Kevin Ottens ervin[email protected]@kde[email protected].org

Enumeration Type Documentation

SleepState

enum Solid::PowerManagement::SleepState

This enum type defines the different suspend methods.

• StandbyState: Processes are stopped, some hardware is deactivated (ACPI S1)
• SuspendState: Most devices are deactivated, only RAM is powered (ACPI S3)
• HibernateState: State of the machine is saved to disk, and the machine is powered down (ACPI S4)
• HybridSleepState: The contents of RAM are first copied to non-volatile storage like for regular hibernation, but then, instead of powering down, the computer enters sleep mode

Enumerator
HybridSuspendState	Since 4.11

Definition at line 54 of file powermanagement.h.

Function Documentation

appShouldConserveResources()

bool Solid::PowerManagement::appShouldConserveResources

(

)

Retrieves a high level indication of how applications should behave according to the power management subsystem.

For example, when on battery power, this method will return true.

Returns

whether apps should conserve power

Definition at line 76 of file powermanagement.cpp.

beginSuppressingScreenPowerManagement()

int Solid::PowerManagement::beginSuppressingScreenPowerManagement

(

const QString &

reason = QString()

)

Tell the power management subsystem to suppress automatic screen power management until further notice.

Parameters

reason

Give a reason for not allowing screen power management, to be used in giving user feedback about why a screen power management event was prevented

Returns

a 'cookie' value representing the suppression request. Used by the power manager to track the application's outstanding suppression requests. Returns -1 if the request was denied.

Since

4.6

Definition at line 135 of file powermanagement.cpp.

beginSuppressingSleep()

int Solid::PowerManagement::beginSuppressingSleep

(

const QString &

reason = QString()

)

Tell the power management subsystem to suppress automatic system sleep until further notice.

Parameters

reason

Give a reason for not allowing sleep, to be used in giving user feedback about why a sleep event was prevented

Returns

a 'cookie' value representing the suppression request. Used by the power manager to track the application's outstanding suppression requests. Returns -1 if the request was denied.

Definition at line 106 of file powermanagement.cpp.

requestSleep()

void Solid::PowerManagement::requestSleep	(	SleepState	state,
		QObject *	receiver,
		const char *	member
	)

Requests that the system go to sleep.

Parameters

state	the sleep state use
receiver	the object to call a slot on once the operation completes
member	the slot to call

Definition at line 86 of file powermanagement.cpp.

stopSuppressingScreenPowerManagement()

bool Solid::PowerManagement::stopSuppressingScreenPowerManagement

(

int

cookie

)

Tell the power management that a particular screen power management suppression is no longer needed.

When no more suppressions are active, the system will be free to handle screen power management automatically

Parameters

cookie

The cookie acquired when requesting screen power management suppression

Returns

true if the suppression was stopped, false if an invalid cookie was given

Note

Since 4.8, this function also inhibits screensaver

Since

4.6

Definition at line 164 of file powermanagement.cpp.

stopSuppressingSleep()

bool Solid::PowerManagement::stopSuppressingSleep

(

int

cookie

)

Tell the power management that a particular sleep suppression is no longer needed.

When no more suppressions are active, the system will be free to sleep automatically

Parameters

cookie

The cookie acquired when requesting sleep suppression

Returns

true if the suppression was stopped, false if an invalid cookie was given

Definition at line 125 of file powermanagement.cpp.

supportedSleepStates()

QSet< Solid::PowerManagement::SleepState > Solid::PowerManagement::supportedSleepStates

(

)

Retrieves the set of suspend methods supported by the system.

Returns

the suspend methods supported by this system

See also

Solid::PowerManagement::SleepState

Definition at line 81 of file powermanagement.cpp.