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GL703GS with 1070 and XiaoMi Mi 34" (3440x1440) issues at 144Hz

hexaae
Level 12
I have a XiaoMi Mi 34" 3440x1440 connected through a VESA certified 8K DP1.4 cable (DPmini--DP), but found that running at 120Hz or 144Hz causes random "blackouts" (aka black screen flickering) like this:

It NEVER happens if I set 100Hz. Is this normal? I already swapped 3 different 8K DP1.4 cables but nothing changed.
I thought it could be a faulty monitor but I've found the same on another monitor with the same specs... So at this point I wonder: maybe the GTX 1070 8GB (Max-P, 10DE 1BE1 - 1043 1011, GP104 A1, vbios 86.04.7c.00.24, Samsung VRAM) in this laptop is not fully DisplayPort 1.4 compatible and 3440x1440 @ 120/144Hz are too much? 😞
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ASUS ROG Strix GL703GS, GTX 1070 8GB, 32GB RAM, 1920x1080 144Hz G-Sync laptop screen, external monitor UWQHD 3440x1440 Mi Monitor, NVMe 4x, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse
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6 REPLIES 6

xeromist
Moderator
I would try changing color modes to see if that makes any difference. Try ycbcr444 instead of RGB. If that doesn't help try 422. It won't be as accurate but you'll have to decide if it bothers you after you adjust the picture settings.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…

hexaae
Level 12
Already tried 4:2:2 too, and didn't change 😞
I think this laptop's gfx card has an old DP firmware: I've found this for example but was only for desktop gfx cards NVIDIA Graphics Firmware Update Tool for DisplayPort 1.3 and 1.4 Displays that's why I start to think is actually the laptop and not the monitor.
Only ASUS could help with a gfx card fw update in this case...
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ASUS ROG Strix GL703GS, GTX 1070 8GB, 32GB RAM, 1920x1080 144Hz G-Sync laptop screen, external monitor UWQHD 3440x1440 Mi Monitor, NVMe 4x, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse

xeromist
Moderator
Even if the laptop is already on 1.4 or gets updated, if the hardware isn't up to 1.4 spec it won't work well at higher bitrates. Since it's allowing you to select the mode I think all of the hardware is already version compatible but it sounds like you are experiencing enough signal loss/noise to cause problems. You could try different drivers to see if that makes a difference but I'm not optimistic.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…

xeromist wrote:
t it sounds like you are experiencing enough signal loss/noise to cause problems. You could try different drivers to see if that makes a difference but I'm not optimistic.

I can exclude signal loss/noise since I tested 3 different 8K expensive VESA certified cables. Already tried different drivers but no changes. I'm afraid this laptop with 1070 has an old DP firmaware in the vbios, causing issues at very high throughput. 100Hz is stable, so the monitor seems ok I guess and can be excluded or I should see the same temporary blackouts at any freq.
I must be the only one with GL703GS + a UWQHD 144Hz monitor 😞
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ASUS ROG Strix GL703GS, GTX 1070 8GB, 32GB RAM, 1920x1080 144Hz G-Sync laptop screen, external monitor UWQHD 3440x1440 Mi Monitor, NVMe 4x, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse

xeromist
Moderator
I'm not saying your cable is the issue necessarily. The output port has its own noise floor and signal characteristics before your cable is even connected to it. I'm saying that hardware inside the notebook may not be up to the task even with a firmware update, but one can always hope.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…

hexaae
Level 12
Other interesting facts and clues...
GPUz says bandwidth at 120Hz is already saturated (8.1Gbps, which looks like HDMI limt even if is DP connected (???) ), but at 100Hz (which is stable and never gives "blackouts") is ok under max limit reporting 5.4Gbps:
90598
Or maybe GPUz is unreliable here... or is just reporting xLane speed (in this case x4)...
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ASUS ROG Strix GL703GS, GTX 1070 8GB, 32GB RAM, 1920x1080 144Hz G-Sync laptop screen, external monitor UWQHD 3440x1440 Mi Monitor, NVMe 4x, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse