Displayport monitor does not wake from sleep

Question

Hi,

just purchased a Sapphire HD Radeon 7790 & realized I could connect three monitors - yay.

On a couple of occasions the smaller monitor connected via displayport has not awakened from sleep. I hear a beep as if removing USB device. Powering the monitor off / on fixes it.

Both monitors connected with DVI awake no problem.

I see threads referring to assigning the displayport as the initial display adapter in the BIOS, however I see nothing in the my BIOS (XPS 435MT) for any display adapters. The GPU (I'm assuming it's the GPU) set the dsiplayport monitor as the #1 monitor in the numbering scheme. My understanding that I have no control over that. The DVI attached monitors are numbers 2 & 3.

Have thoroughly scanned the event logs during that time frame & can find nothing.

Any help?

thank you

daemoncycler · Accepted Answer

Going to update & answer this post, hopefully it will help someone else. Apparently TriXX is OK on the 7790.

This YouTube video is my card:

YouTube TriXX video of Sapphire 7790 OC Dual-X

If that doesn't work you might try altering the power settings in the BIOS - in my case the Power Management Setup in the BIOS is not configured for the mildest sleep state.

Right now the ACPI Suspend Type is S3 str:

ACPI Suspend to RAM : ACPI stands for Advanced Configuration and Power Interface - which some people may find as options in their BIOS setup programs. The Suspend to RAM feature, sometimes referred to as S3/STR, lets the PC save more power when in Standby mode, but all devices within or attached to the computer must be ACPI-compliant. Some BIOS's offer an S1/POS option for this scenario. If you enable this feature and experience problems with the standby mode, simply go back into the BIOS and disable it. (not one of my options)

Setting ACPI to more power hungry form of suspend e.g. s1 (POS) Power on Standby could be the answer:

S1: All the processor caches are flushed, and the CPU(s) stops executing instructions. The power to the CPU(s) and RAM is maintained. Devices that do not indicate they must remain on may be powered off.

S3: Commonly referred to as Standby, Sleep, or Suspend to RAM (STR). RAM remains powered.

DELL-Chris M · Answer

daemoncycler,

This is a video card, video card driver, or operating system power management issue. The monitor DP (DisplayPort) is passive. It simply waits for the signal from the video card to awake. By powering the monitor off/on, you are forcing the operating system and/or video card to reinitiate the DP handshake. The Radeon HD 7790 has eight power management states through its PowerTune technology. My guess is somewhere in that software is the ability to tell it to adjust what the card is doing as far as power management.

daemoncycler · Answer

Thanks Chris M

Sorry to be such a noob - the only control I'm aware of is thru Catalyst Control Center / AMD Overdrive. There are Power control settings there, along with GPU clock, memory clock & fan control settings.

Can you help me reassign this thread to the Desktop Video forum?

Yesterday I used the AMD Catalyst Un-install Utility & then Driver Sweeper to clean out old driver files. & then AMD Driver Autodetect to update the most current drivers.

Edit: I found something called TriXX Tweak Utility from Sapphire. Going to post on the Sapphire forum & ask for assistance.

daemoncycler · Answer

Looks like the 7790 is not on the SAPPHIRE Eligible Product List for TRiXX Utility. That's unfortunate because:

From the Sapphire Forum-

TriXX has a power related setting "Disable ULPS" (Ultra-Low Power State).
It is no function to wake up, only a function GPU shall not go into idle state.

Disable ULPS sounds to me like it might be worth a try.

AMD Overdrive & MSI Afterburner look to me about the same for functionality. Nothing like ULPS.

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Displayport monitor does not wake from sleep

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