EEVblog #1107 - Shocking 4K BENQ Monitor Problem!

[wraper]

Nothing can send shutdown signal to a PC unless it's a USB HID device like a keyboard. And even then it will be a normal shutdown like if you have done it from start menu, not immediate turn off.

I don't know about displayport or DVI, but an HDMI monitor port can send a shutdown command to a connected device. The HDMI ports on PC are not generally configured to react to those commands, but they do exist, and things like AV receivers are generally configured to be started and shut down by those HDMI signals from the monitor.

Yes there is HDMI CEC, but generally you cannot even control a TV from PC without using additional USB-CEC adaptor, not to say other way around. Most of graphics cards have no hardware support for it.

[coppice]

Nothing can send shutdown signal to a PC unless it's a USB HID device like a keyboard. And even then it will be a normal shutdown like if you have done it from start menu, not immediate turn off.

I don't know about displayport or DVI, but an HDMI monitor port can send a shutdown command to a connected device. The HDMI ports on PC are not generally configured to react to those commands, but they do exist, and things like AV receivers are generally configured to be started and shut down by those HDMI signals from the monitor.

Yes there is HDMI CEC, but generally you cannot even control a TV from PC without using additional USB-CEC adaptor.

I think its probably a matter of configuration rather than capability. Current games machines use similar hardware to PCs. If the GPU in a games machine has CEC, I expect the GPU in a PC has it too. I don't know why they would leave it out. Its such a small part of the device.

[wraper]

Nothing can send shutdown signal to a PC unless it's a USB HID device like a keyboard. And even then it will be a normal shutdown like if you have done it from start menu, not immediate turn off.

I don't know about displayport or DVI, but an HDMI monitor port can send a shutdown command to a connected device. The HDMI ports on PC are not generally configured to react to those commands, but they do exist, and things like AV receivers are generally configured to be started and shut down by those HDMI signals from the monitor.

Yes there is HDMI CEC, but generally you cannot even control a TV from PC without using additional USB-CEC adaptor.

I think its probably a matter of configuration rather than capability. Current games machines use similar hardware to PCs. If the GPU in a games machine has CEC, I expect the GPU in a PC has it too. I don't know why they would leave it out. Its such a small part of the device.

What similar hardware? Console SoC is similar in regards of GPU/CPU architecture but that's about it. Those are specialty chips designed for the consoles only.

[coppice]

Nothing can send shutdown signal to a PC unless it's a USB HID device like a keyboard. And even then it will be a normal shutdown like if you have done it from start menu, not immediate turn off.

I don't know about displayport or DVI, but an HDMI monitor port can send a shutdown command to a connected device. The HDMI ports on PC are not generally configured to react to those commands, but they do exist, and things like AV receivers are generally configured to be started and shut down by those HDMI signals from the monitor.

Yes there is HDMI CEC, but generally you cannot even control a TV from PC without using additional USB-CEC adaptor.

I think its probably a matter of configuration rather than capability. Current games machines use similar hardware to PCs. If the GPU in a games machine has CEC, I expect the GPU in a PC has it too. I don't know why they would leave it out. Its such a small part of the device.

What similar hardware? Console SoC is similar in regards of GPU/CPU architecture but that's about it. Those are specialty chips designed for the consoles only.

The chips are custom, but they are build from cores used elsewhere.

[wraper]

The chips are custom, but they are build from cores used elsewhere.

So what? Microsoft or Sony said AMD to put CEC hardware inside their SoC, so AMD did it. Or maybe CEC has nothing to do with AMD SoC and they made it some other way. AMD and Nvidia has no reason to implement it on PC hardware as barely anyone uses it.

[coppice]

The chips are custom, but they are build from cores used elsewhere.

So what? Microsoft or Sony said AMD to put CEC hardware inside their SoC, so AMD did it. Or maybe CEC has nothing to do with AMD SoC and they made it some other way. AMD and Nvidia has no reason to implement it on PC hardware as barely anyone uses it.

Have you designed any silicon recently? 30 years ago when I wanted to get a handful of extra gates into a design to provide an interesting extra function there would be loud voices trying to shut me down. Now everyone wants to make their designs feature complete, even if this adds a LOT of gates. Its cheap, and if it turns out a sizeable customer unexpectedly wants the extra bits, you don't want to lose sales. Its only when your additions add to the pin count that you get push back against completeness.

[wraper]

The chips are custom, but they are build from cores used elsewhere.

So what? Microsoft or Sony said AMD to put CEC hardware inside their SoC, so AMD did it. Or maybe CEC has nothing to do with AMD SoC and they made it some other way. AMD and Nvidia has no reason to implement it on PC hardware as barely anyone uses it.

Have you designed any silicon recently? 30 years ago when I wanted to get a handful of extra gates into a design to provide an interesting extra function there would be loud voices trying to shut me down. Now everyone wants to make their designs feature complete, even if this adds a LOT of gates. Its cheap, and if it turns out a sizeable customer unexpectedly wants the extra bits, you don't want to lose sales. Its only when your additions add to the pin count that you get push back against completeness.

Whatever there is hardware capability or not, there is no firmware/software support for it. Also I grabbed some random GTX 1080Ti schematic and CEC pin is not connected.

[PolishGandalf215]

Sorry Coppice & Wraper but that went over my head.

While the PC was at the store, I tested different HDMI cables between my PS5 and my Samsung Odyssey G7. I bounced in my chair and got up and down. Some cables prevented the monitor from flickering while others did not. This coincides with the original video.

The store replaced my motherboard and I have been testing the cables. I have several HDMI, DP, and Hybrid cables. Just like the previous HDMI testing, there were DP cables and Hybrid cables that worked while others did not. So far, I have not seen a complete shutdown which is the ultimate problem. As of now, I am only using HDMI and DP cables that don't allow the flickering of the monitor. I will update if/when the complete PC shutdown occurs again.

I do have a PowerColor AMD Radeon RX 6950 XT Red Devil Overclocked Triple Fan 16GB GDDR6 PCIe 4.0 Graphics Card, Gigabyte B650 AORUS Pro AX AMD AM5 ATX Motherboard, and an EVGA SuperNOVA 1000 GT 80 Plus Gold 1000W Fully Modular Power Supply. I was wondering if those components could be impacted by EMI.