Had the same problem in my Macbook(15") pro running 10.9.4.
I wanted my Mac to be locked while I was away (so configured hot corners) but at the same time did not want it to sleep (irrespective of whether it is connected to power or not) so that my wifi will be "ON" always for my jabber & mails. So here's what I did to prevent Mac from sleeping:
What worked for me:
1) Change the hot corner action to something different. It should work.
2) Restart your Mac
3) Change the hot corner back to the original action.
I just checked that the action keeps working after a restart.
I'm on MBP 15'' Retina Mid-2014 with El Capitan.
I believe this does the trick (at least it seems to have worked for mefor several hours now):
sudo defaults write /Library/Preferences/com.apple.screensaver loginWindowIdleTime 0
This disables the screensaver in the loginwindow.
On a rather obscure comment thread, someone explained where you might find the word list that Apple uses to power the screensaver. It is at /System/Library/Graphics/Quartz\ Composer\ Plug-Ins/WOTD.plugin/Contents/Resources/NOAD_wotd_list.txt. The file looks like this:
That is a nice way of starting a random screen saver.
If, however, you'd simply like to start the active screen saver, you can use this in Mountain Lion:
tell application "System Events"
start current screen saver
Use Automator. Simply open automator and drag in the "start screen saver" action, select "no input" under the "services received" menu, and hit file > save as "Start Screen Saver".
This will now appear under System preferences > Keyboard > Shortcuts > Services > General, where you can assign it any hotkey you desire, just as you would any other system ...
Check out this discussion: Screensaver "start time" option grayed out
The system administrator has probably set the screensaver timeout in a user profile. You can't change it without removing the profile, which will probably cause you to lose network access.
Check if you have a profile (overriding your personal settings) by Apple > System Preferences ...
"iSeeYou: Disabling the MacBook Webcam Indicator LED" is a paper by Matthew Brocker and Stephen Checkoway from the Johns Hopkins University. In this paper they explain on how to disable the LED when using the camera. In short: normally you use the CPU to access the camera and activate the LED, but you can also use the processing unit in on the camera board ...
I cannot tell about screensaver for sure, but you can use pmset -g to show which process is disturbing sleep (think this first appeared in 10.6.7)
# pmset -g
sleep 0 (imposed by 1517)
this means that pid 1517 is preventing the system from sleeping.
# ps ax |grep 1517
1517 ?? Rs 1:59.76 /System/Library/CoreServices/backupd
Many moons later, I wanted the same thing and I found a solution. I use BetterTouchTool to manage all of my keyboard/mouse/trackpad shortcuts and configurations. So I created a keyboard shortcut that runs a terminal command when pressed. To launch the screen saver from the terminal, use this command:
open -a /System/Library/Frameworks/ScreenSaver.framework/...
I found a solution that works for my needs: As it turns out, I should not lock the screen, but instead start the screensaver, and require the screensaver to immediately require a password.
I created a 'Start Screensaver' service with Automator, and then selected a keyboard shortcut for that service under Settings->Keyboard->Shortcuts->Services.
Deleting that wouldn't work. The only keys stored in that property list, by default, are:
njboot$ defaults read com.apple.screensaver
askForPassword = 1;
askForPasswordDelay = 900;
These keys are tied to: System Preferences > Security & Privacy > General > "Require Password 15 minutes (900/60) after sleep or screen saver begins."
If you have 10.8, you can enable French, German, Simplified Chinese, and Spanish dictionaries from the preferences of Dictionary.app:
They don't seem to be shown as choices for the Word of the Day screensaver though:
I also tried restarting after enabling the dictionaries.
You can set your screensaver to be your desktop background (link to source).
To do so, run this in the Terminal:
This works on both monitors (tested just now in Lion), so as long as you don't put any windows on the other monitor, ...
Hot Corners is a feature of macOS that lets you assign instant actions for when you move the mouse pointer to any one of the four corners of your Desktop.
Hot Corners can lead you to pretty powerful workflows using just the mouse cursor, such as:
Instantly showing/hiding the Dashboard.
Putting the display to sleep
Showing the Desktop
If you are not forced to use defaults write you can use the following command. It interacts with the OS the same as if you were to utilize System Preferences.
sudo osascript -e 'tell application "System Events" to set require password to wake of security preferences to false'
NOTE: If the command is being run ...
This works in ML:
tell application "System Events"
set ss to screen saver "Random"
"Random" can be replaced with your choice, "Flurry" or "Shell" and so on.
Source Disclosure: http://hintsforums.macworld.com/showthread.php?t=111478
The answer is in your post. Just uncheck "Wake for Wifi Access" in the System Preferences under Energy Saver, Power Adapter.
When it's checked, it means that your computer disconnects from the network when you're computer's not awake.
Previous answer still works, and also for Yosemite/El Capitan/Sierra with the caveat that System Integrity Protection (SIP) now needs to be disabled first.
Verify current slide duration:
sudo /usr/libexec/PlistBuddy -c "print ':JustASlide:mainDuration'" /System/Library/PrivateFrameworks/Slideshows.framework/Versions/A/Resources/Content/EffectDescriptions....
My understanding is, it depends on the model of your Macbook. The ability to turn the camera on without the green light was only proven in pre-2008 laptops. No proof exists that you can do the same in post-2008 laptops.
This question Are there privacy concerns with the Built-In iSight Camera and LED Indicator? seems to agree that newer models you can't.
According to this discussion it is supposed to open the "Dictionary" app. However, according to that discussion doesn't seem to work if the screensaver is set to require a password.
I have not tried on MacOS X 10.8, but on 10.9 it is no longer possible to disable the password of the screensaver and only set the time after which the screensaver activates. So ...
The path and functionality have seemed to change. Heres a link and quoted tutorial to do it. Unfortunately, it appears its much more of a hassle in High Sierra+.
If you are using High Sierra (or later), the ScreenSaverEngine.app has
been moved to a different location. Use the code below instead of the
Move it into ~/Library/Screen Savers if you are the only one who wants to use it, or into /Library/screen Savers if you want all users on the machine to have access to it (note ~/Library is hidden by default in Lion: you can access it by holding Option when clicking the “Go To” menu in Finder).
UPDATE: Works in Mac OS Mojave!
This has been a known issue for months (since High Sierra beta came out). Hopefully the Google+ team is working on a fix, feel free to send them feedback directly to encourage them.
It isn't possible to disable the login screensaver in Mountain Lion due to a bug. According to https://discussions.apple.com/thread/4540671?start=0&tstart=0 the best you can do is log into root's screensaver settings and change it to Message which uses less resources.
See https://apple.stackexchange.com/a/16515/21181 for how to do that.
The "Computer Name" screensaver is stored in /System/Library/Screen\ Savers/FloatingMessage.saver.
Displaying the computer name is just the default text for this screen saver, you can enter other texts in the Screen Saver Preferences.