I want to change my laptop's power plan via Remote Desktop Connection, but the option is greyed.
I am logged with the admin account and both PC's are running Windows 7.
What could be the problem?
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This should be possible if you connect to
RDP. To do this, open command prompt and connect to RDP server like this:
mstsc /v:server /console
server with your server's hostname or IP.
Console is special kind of remote session to which only one connection can be connected at the time. You can find more information on Microsoft TechNet: http://technet.microsoft.com/en-us/library/cc740144%28v=WS.10%29.aspx
You must be in a local session with the computer to change power options using the battery icon (I don't know why unfortunately).
You could possibly use the Control Panel for this, but again I think you must be in a local session.
You could change by a VNC connection, as that will connect you to the console.
Typically, you can do from a command line, in a remote session, what you can't do through the UI. In this case, you should be able to run POWERCFG with appropriate options, even though you can't run through the battery or control panel UIs.
The options for the command are detailed at http://technet.microsoft.com/en-us/magazine/ff700230.aspx