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April 13th, 2021 16:00
m15 R4, 3080, VSync not working on external screen
I took delivery of a new M15 R4 i7 w/RTX 3080 and everything's fine when using the laptop's screen, but when I output to my 24" 75hz external screen I can't use VSync. The GPU clock and memory speed both fluctuate like crazy between two values - the base clock speed and a very low clock speed (c. 300Mhz) - and the frame rate sort of pulses in sync with that behaviour and any game is unplayable with VSync enabled.
Sadly this is a FreeSync 1 screen and not certified so it isn't working great in G Sync compatibility mode, so VSync is a necessity to deal with screen tearing.
The issue presents the same if I set an upper limit to the frame rate either in game or in the Nvidia control panel.
I've tried:
Adaptive VSync, triple buffer, disabling the iGPU, disabling G Sync, 60Hz instead of 75, limiting frame rate just below the screen's native refresh rate, limiting frame rate to 75, low latency mode, HDMI instead of display port, older drivers, latest drivers... Pretty much everything I could think of.
VSync and G Sync work perfectly on the laptop screen together or independently, it's just when outputting to the external.
One of the reasons this is so frustrating is that my favourite game is Sekiro, which requires VSync because the physics and timing are linked to frame rate.
Any ideas? I've never heard of a PC or laptop and screen combo that prevented VSync from working properly. Could this be Optimus related? When I enable the discreet GPU only, performance decreases generally on either screen and it doesn't resolve the VSync issue.
Many thanks
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DELL-Cares
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April 14th, 2021 10:00
We tried reaching you on a private message asking for the Service Tag number to ascertain the warranty but did not receive a response. Please feel free to reply to the private message whenever you are available.
kingsta1
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April 14th, 2021 16:00
I believe this is an issue with Optimus. Setting power management in the Nvidia control panel to "Performance" helps but doesn't resolve it. The only way I can use VSync on an external screen is by using MSI Afterburner to lock the core clock speed to the base clock (1275MHz), as this prevents the GPU fluctuating between boost and 400MHz. This isn't an ideal solution and I wonder if there's a fault with the GPU, or perhaps it will be resolved with a future driver release.
Edit: thermals are fine whatever configuration I'm running. With the GPU clock speed locked to 1275MHz I've never seen the GPU reach 60c and the CPU rarely goes above 80c.