Monitor doesn't sleep as specified in computer power options

I have just bought a Toshiba 26C100U1 TV/Monitor, and have it connected to a HP desktop (tower), running Win7 (64-bit). Video card is ATI Radeon HD 4350. Monitor is connected via VGA. I tried HDMI, but the monitor then lost its PC settings and sound. So it's currently using the VGA connection.


BTW The Device Manager just calls the monitor a generic PnP monitor. And I found a list of so-called Windows-compatible monitors and the 26C100U1 wasn't listed...



The monitor works pretty well, but it won't go to sleep as specified by the power options (the monitor has its own sleep function, but that is just to switch off when you're asleep!). Any time I expect to be away from the computer for more than an hour or so, I have to manually put the computer to sleep and then switch off the monitor. This is a pain!



I have the desktop power options set to put the monitor to sleep after 10 mins, and the computer after 20 mins (same settings as with previous monitor). Nothing happens on the monitor after 10 mins - and after 20, the computer goes to sleep as specified, and then we just see the blue "no video signal" stripe cycling up and down the screen forever! I must stress that the monitor sleep function worked fine with the previous monitor that was attached to this computer, but when I simply changed to the new monitor, the monitor sleep function stopped working.

As far as I can tell, the BIOS and video card drivers are up to date. There is apparently a Toshiba firmware download available for the 26C100U1, but its description doesn't say anything about this problem - would installing it make a difference? Any other ideas? TIA

Well, I see Toshiba offered you a lot of good advice!

I would try it on another computer and see what happens. And double check the TV's manual for menu options.

As far as the firmware update, from what I read, it has to do with HDMI support with game stations. You had problems with HDMI so you might consider the upgrade. I note by using VGA, you are going analog and are not seeing the quality that monitor can provide with digital.

Thanks, Bill! I actually did try updating the firmware on the Toshiba monitor, and it didn't make any difference. I have also checked every option on the monitor's menu, and thought I had found one option that looked relevant, but it didn't fix my problem.

Based on the fact that there has been this deafening silence, I have the feeling that I am missing something fundamental... This problem has never happened to me with any previous computer/monitor combination. I found a list of monitors that Windows knows about, and the 26c100u1 wasn't there - is there some way of updating some Win7 table? I am also wondering if the monitor is ACPI-compliant (if that's the right term) - but that seems to be more of a BIOS thing. Sorry, I know very little about the BIOS and drivers... :-) TIA

PS Found this thread - http://www.tomshardware.com/forum/25...3-monitor-shut - so the problem seems to be not so uncommon. There are some things worth trying here... (I am using VGA, though).

The product manual for your TV/Monitor states that it will ONLY Auto-Shutdown when tuned to a station that is not broadcasting or ceases broadcasting for the day. It states this ONLY applies in the ANT/CABLE setting or function.

There is no sleep function listed or discussed in the manual. It's pretty safe to assume that if it's not mentioned in the user manual, then the function doesn't exist.

It looks like your out of luck on this one. You'll just have to do the extra step of turning off the TV manually.

I have a Vizio TV/monitor here in my office and I know it shuts down in PC mode when the attached computer goes to sleep. What I find frustrating is while I can wake the computer by wiggling the mouse, I have to hit the power button on the monitor, even though it is still in PC mode.

I also have a Toshiba TV/Monitor, different model, in the grandkids' room and it seems to work the same as the Vizio. But there is a menu setting in both for "Auto Shutoff". If you have DVI, you might try that. It contains the exact same superior digital video as HDMI, just no audio.

Strangely enough, I changed some of the REGZA-LINK settings, and the monitor now seems to be getting some kind of signal at monitor sleep time - but it now puts up a password prompt (sort of sleeping without switching off the monitor) - and I'm not sure which of the settings made the difference... :-)

I am really confused now! I am trying the High-Performance power option in Win7, with monitor sleep set to 15 mins, and computer sleep set to "never". At 15 mins or thereabouts, the monitor switched to showing the login screen, and at some point after that (don't know exactly when), the computer went to sleep, resulting in the blue "no video signal" message on my screen.

Can Bill, or anyone, shed some light on what variously: my computer is doing, Win7 is doing, and/or my monitor is doing?! Help would be much appreciated!

PS Is there any command or utility that I can use to send a sleep signal to my monitor?

Afraid I don't have an answer but maybe a suggestion. Since Toshiba seems unwilling to help, perhaps you should consider returning the item and taking your business elsewhere. Frankly if I bought an HDMI monitor and the HDMI connection doesn't work then I'd consider it junk and return it. Also if it is only seen as Generic then it is either the plug-and-play identification isn't right in the monitor or they should be supplying you with specific drivers.

How can a monitor require a password? It sounds like maybe it is the parental controls or something for the TV side but that seems odd for PC use.

You might want to check the power settings from an administrator command prompt to see if sleep is allowed, limitations, etc (it may give you more info you could post back here) ...
- click the start orb and in the search line type "command"
- "command prompt" should be your first choice, select it
- In the box type "powercfg -a" (do not include the quotes)

I don't know of a command to instantly force sleep.

You can instantly put your computer asleep through the Start menu, but that starts the chain of events where the monitor loses signal, then puts itself to sleep. There is no command you can send directly to the monitor.

Note the High Performance power option does not in any way affect the performance of the computer. It just means the computer stays awake, ready to spring into action.

I have mine set to 15 minutes of the display and 20 to put the computer to sleep. Then in advanced options, I have allow hybrid sleep enabled.

Hi Bill, thanks for the info! Sorry if I misled you a bit - I have sleep set to request password on startup. So I suspect that is why that screen comes up :-) I have hybrid sleep set off, as that was causing problems coming out of it on my machine (with the old monitor).

What is strange is that in power options, I have both sleep options set to never, but after about 5 mins of inactivity (or maybe less), it just pops over to the login menu - I haven't measured the time exactly - I assume it thinks it is coming out of sleep...

BTW powercfg -a says that S2 is not supported, but that's all it says... Any other useful options under powercfg?

I am connected using VGA, just like the last monitor (which worked perfectly) - based on your comment, should I try HDMI (I'll need to buy a $50 cable) - some people report better results with that - but others have recommended staying with VGA - what is your take on that?

I really appreciate your staying with this problem - there seem to be so many variables that I may have totally misstated my problem :-)