[SOLVED] Laptop stutters with external 34“ monitor connected ?

[Nemeton]

Hi all, I have problems with my daughter's Alienware M15 R7 laptop with an RTX 3070 Ti and 32GB RAM.

When I plug-in the external monitor via hdmi in the system is awful stuttering.
When unplug the monitor the laptop is instantly responsive and very fast.
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

And because of the fact that the monitor is working with other notebooks, as well as the Alienware 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've been struggling with it for 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.

 

[Nemeton]

Solution: wiped OS system

After I have reinstalled at OS the laptop is running fast again. No problems anymore with the monitor.
So it definitely was a software problem.

No stuttering or lags on the external monitor, I also got 120 FPS on it in games.

 

[Aeacus]

After I have reinstalled at OS the laptop is running fast again. No problems anymore with the monitor.
So it definitely was a software problem.

Win needs to be taken care of regularly, for it to keep working smooth. There are some speciality programs for that and would require good knowledge on what to do. But when one just uses the OS, without the maintenance of it, OS will eventually crap out. Either producing issues, BSoD or complete corruption (not able to boot to OS anymore).

In similar sense, you can drive with a car for many years, but without maintenance, parts will fail until one can't drive with the car at all. But when car is serviced regularly and kept in good working condition, one can drive decades.

 

[Nemeton]

The thing is, I have taken care of the system, updated everything, uninstalled unused programs and always thought about a software before installing it. I really can't imaging what the problem was, maybe something with G-sync or something, but I also can't remember changing something. Anyways, it is running now
Thanks for your support!