DisplayPort switch 2 machines to 1 monitor

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Joined
17 Oct 2007
Posts
347
I'm trying to connect both my pc and work macbook to a single g-sync display at 120Hz. The monitor has g-sync so I can only use the single DisplayPort 1.2 connection as the HDMI 1.4 only supports 50Hz and desktop stuff (am a dev) at 50Hz is not a great experience.

Hardware:
  • Monitor Acer x34p 3440x1440 120Hz (oc)
  • Gaming Pc 9900k, MSI Ventus RTX 3090 OC, 32GB, 2TB m2, 4TB SSD
  • Macbook 2020 M1
  • Brydge Dock
  • 2x KabelDirekt 1m DisplayPort 1.4 VESA certified cables
  • 1x StarTech 1m USB C to DisplayPort 1.4 cable
  • 1x KVM DisplayPort 8K DP 1.4 USB Switch
I can get the 120Hz from both my gaming pc and macbook so no problems there and the gaming pc also recognises the display g-sync capabilities. I can switch between computers and raise them from sleep most of the time without issues.

The problems:
  • Application windows sometimes resize and shift positions after switching between machines or cycling power (not overly bothered but nice to have them remain in their last positions)
  • Pc is mostly ok on the desktop but gaming drops out, black screens, flickering.
  • Macbook is slightly more stable but does the same much less frequently
Does anyone know of a DisplayPort switch which can support this hardware, output 3440x1440 @ 120Hz and not **** the bed when switching between machines / playing games with g-sync enabled etc

I see there are many on Amazon (one of which I've purchased and will be going back) and many retailers out there who supply them but does anyone have first hand experience of one that worked. Really looking to avoid switching my monitor out to solve the issue.

Hardware links:
Brydge Dock: https://www.brydge.co.uk/products/macbook-vertical-dock
DisplayPort Cables: https://www.amazon.co.uk/gp/product/B07HL7RXKM/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
USBC to DisplayPort Cable: https://www.amazon.co.uk/gp/product/B083YZWLWL/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
KVM: https://www.amazon.co.uk/gp/product/B08Q89KM1H/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
KVM instructions lol: https://i.ibb.co/bbS4Bnh/FE7981-BD-BF12-4-AEC-A6-F1-76-D4-F45-D9-E92.jpg

Some that I've found which look promising but no guarantees (mostly US based):
https://connectpro.com/product/udp2-12ap-kit-2port-dual-displayport-kvm/?v=7516fd43adaa
https://store.level1techs.com/products/14-kvm-switch-single-monitor-2computer
 
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