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8 Krypton

Dell u2711 displayport problem "entering power save mode"

Problem started when I replaced the DVI cable with a Displayport cable (have a Sapphire 5670 card) many times the monitor would not start up after sleep mode, and now it hardly starts at all when power on the PC even from a cold state, I know for sure it`s not the cable or the PC, and it cant be the ATI drivers either as I dont even get the boot commands, it`s just black and says "entering power save mode" IF I get the PC to boot and pause at the dos commands before windows starts, and then turn off the monitor when in pause, it never starts up again, so the problem must be the sapphire graphic card or the Dell monitor, but how do I find out? I dont know anyone with a displayport monitor or video card to test with.

282 Replies
8 Krypton

Re: Dell u2711 displayport problem "entering power save mode"

no answers?

Is this normal for the Dell u2711 displayport? Does anyone else have this problem?

Try this

Restart the PC

Press pause directly when the first dos commands show up on screen, or just go inside the motherboard bios, it`s the same, it dont matter

Turn off the monitor for 20 sec

Start the monitor again

Is the screen blanc and says "entering power save mode" ???

 

(I only have the displayport cable connected from the graphic card)

 

Jules93
1 Nickel

Re: Dell u2711 displayport problem "entering power save mode"

Hi Klas Bell,

When the monitor says its going into power saving mode it mostly does so because it doesn't receive a signal from the video card.

Didn't you get a message "No signal" before it said "Going into power saving mode"?

I received these two messages when I started up the first time with the monitor connected.

There was also a flatscreen TV connected to the card and for some reason the card saw the flatscreen, which was turned off, as the default monitor and sent the signal to it..

As long as Windows isn't started (when in DOS mode) the signal goes to both monitors, when the control center is loaded it chooses the "Default monitor" and cuts the signal to the other one.

Both my connections were over DVI not Displayport, but if there comes no signal that doesn't matter.

Couldn't it be that your signal is redirected to another port due to a preference set in the the control center?

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Moderator
Moderator

Re: Dell u2711 displayport problem "entering power save mode"

Klas Bell,

DP Wakeup Issues
* I am seeing these issues on Ati, Nvidia, Windows, Linux, Desktops, Laptops, and non-Dell monitors with DP
* If you allow the monitor to go into any Sleep state, you disable the monitor audio. The monitor has to be cycled off/on to relink the DP audio to the PC sound system
* If you allow the monitor to go into any Sleep state, the PC video card releases the link to the monitor DisplayPort. Possible workarounds
- While the PC and monitor are on, disconnect/reconnect the DP cable from either end
- Disconnect/reconnect the monitor power cord from the back of the monitor



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8 Krypton

Re: Dell u2711 displayport problem "entering power save mode"

I only have the displayport cable connected to graphic card, so it cant be "redirected to another port" problem, and this problem is only with displayport, not with DVI.

There is no "no signal" message before entering power save mode, and of course I have disabled all the powersave mode in windows, but that should not matter anyway since I get this problem in DOS mode also.

 

 

quote

"I am seeing these issues on Ati, Nvidia, Windows, Linux, Desktops, Laptops, and non-Dell monitors with DP"

Pretty much everywhere then! does anyone don`t have this problem!!!

And nobody knows what the problem is???

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Festisio
1 Copper

Re: Dell u2711 displayport problem "entering power save mode"

YES!!

 

I have this exact problem, and found this thread from googling.

 

I have the U2711 and ATI 5970 and this has started happening fairly recently.  It used to snap out of it however it doesn't any more.  Damn annoying frankly.  I also use the display port connecttion for the U711 as the other 2 outputs go to different screens.

It may well be updated ATI CCC that has borked this, I know I recently upgraded that, but I don't want to downgrade the drivers just because the monitor is badly designed.

Really unimpressed with this, you don't go buy a nearly £1000 monitor just to have it play up with silly things like this.

Moderator
Moderator

Re: Dell u2711 displayport problem "entering power save mode"

So two users with non-Dell PCs and retail Ati video cards with the same issue. The only other report of this is on the Dell Studio XPS 1640 DP (Display Port). On that one, we did not have a fix and the customer had to use DVI.

Klas Bell Radeon HD5670
Festisio Radeon HD5970

What version of the Ati driver are you both using?



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simonspivey
1 Copper

Re: Dell u2711 displayport problem "entering power save mode"

I seem to have a similar issue with a U2410 monitor--connecting Lenovo T410 with Intel GMA-HD (Core i5) video. VGA works OK (no DVI on laptop) but monitor goes into power same immediately when connected via displayport. Ironically, it detects 'no cable' and powers UP when disconnected. Windows 7 detects and identifies the monitor. Driver shows 'DP' or 'Analog' correctly. I've tried mirroring desktops, extending, etc, no change.

Am going to try finding DP->DVI converter to see if it's at the monitor or the laptop end.

S.

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8 Krypton

Re: Dell u2711 displayport problem "entering power save mode"

I have tried 10.6 and 10.7 ati drivers

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8 Krypton

Re: Dell u2711 displayport problem "entering power save mode"

Just got two new U2711's (from Dell.com) to use on a month old Area-51 with an ATI 4870.  Decided to use DP on both these (dual U2711 setup).

Unboxed and connected with DVI --> DP cables.  Turned on Area-51, no video.  Tried one monitor at a time...no video.

I then tried using the old DVI cables and a DVI --> DP pigtail adapter that came from Dell (comes with Latitude Z600).

Still, no video.  Finally, I decided to try DVI --> DVI and both monitors worked correctly.

 

Apparently, there is a MAJOR problem with the DP ports on the U2711 monitors.

How do we get this fixed????

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