Question Alienware M15 stuttering with external 34“ monitor

[Nemeton]

Hi all, I have problems with the laptop of my daughter.
When I plug-in the external monitor via hdmi in the system is awful stuttering.
When unplug the monitor the system is instant fast as hell.
The monitor is a LC Power M34-UWHQ.
I have no problems with the old HP E243 Office Monitor in 1080p.

Things I have tried:

• Updating gpu and any other drivers as well as system updates
• Reduce from 1440p to 1080p
• Switched between 100hz and 60hz
• Switched the HDMI cable
• Reinstalled Alienware command center
• Reset monitor (on monitor itself)
• deactivated igpu
• Reset display settings via CTRL Shift Win B
• tested the monitor with an other laptop - there it is running fast

The laptop is an Alienware M15 R7 with an RTX3070ti and 32GB Ram.
And because of the fact that the monitor is working with other notebooks as well as the Alienware is also working with other monitors there must be something between the Alienware and this specific monitor.

I am running out of ideas how to solve it… I am struggling since 2 fkin weeks.. 😓

Maybe somebody has an idea…

 

[Aeacus]

LC Power M34-UWHQ.

You forgot to mention that this monitor is 2K ultrawide, with 3440x1440p reso.

I have no problems with the old HP E243 Office Monitor in 1080p.

Well, yeah. Far less pixels to render on 1920x1080p reso.

Pixel count wise;
2K ultrawide has 4953600 pixels to render.
1080p has 2073600 pixels to render.

Thats 2.5 times more pixels to render on LG, than on HP monitor. And this is where i think, the diff is.

with an RTX3070ti

Do note that laptop version of GPU is FAR inferior to the desktop version of the same GPU.

RTX 3070 Ti for laptops is equal to RTX 2070 Super for desktops,
comparison: https://gpu.userbenchmark.com/Compa...ptop-vs-Nvidia-RTX-2070S-Super/m1757879vs4048

 

[Nemeton]

Like I have written in my tasks I have reduced the resolution from 1440 to 1080p, especially 1920x1080 on the monitor and this doesn’t solved the problem.
Also the monitor has been working fast before, but from one day to another the pc was stuttering and that’s also the reason why I think there must be any setting or something.

Also my 2070S in my desktops runs faster with an higher resolution, there I have a 32:9 49“ from Samsung.

And also the thing is, that my office laptop with an intel iris gpu on the cpu can work with this monitor.

It is stuttering in instantly when I plug it in, I don’t have to start any app or something.

It is stuttering only with the gaming laptop, the potato office notebook works well with this monitor.

 

[Aeacus]

Like I have written in my tasks I have reduced the resolution from 1440 to 1080p, especially 1920x1080 on the monitor and this doesn’t solved the problem.

Well, you can reduce the resolution as well (downscale), but that doesn't make any less pixels to render. Monitor still has nearly 5 million pixels on it's screen.

Unless, you're using only 2/3 of the screen on 1080p reso; e.g like seen here [compare 2K ultrawide (purple) and 1080p (red) sizes]:

Direct link if image doesn't load: https://i.redd.it/o5dyzcld6os11.png

But i don't think you'd use part of the screen on 1080p. Image is still full screen, right?

Also the monitor has been working fast before, but from one day to another the pc was stuttering and that’s also the reason why I think there must be any setting or something.

If so, then what's changed? Since something had to change.

In an event it could be software issue and you have 0 clue what changed, best would be starting from fresh page. This means, format OS drive and make a clean, Win installation.

This will get rid of all software conflicts, bloatware and malware (except firmware rootkits). Also, this is the easiest and fastest fix.
Downside is, that every personal data on OS drive goes (since that's what drive format does). But personal data can be backed up before the wipe.

Also, making new, clean Win install, is actually another troubleshooting step. Since when laptop still stutters even with clean OS installation, the issue is hardware.