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theFiremanComing
User level: Level 1 (4 points)

MacBook Air M5 with Thunderbolt 4 Dock unable to display correct 5120x1440 resolution on 32:9 monitor

Hi, I just got my MacBook Air 13 with the M5 processor. I'm order to take advantage of the upgraded computer, I was guided toward OWC, for their mac-first approach at docks and purchased their Thunderbolt Go Dock a week ago and a 8k Certified 2.1 HDMI cable to connect to my LG 49" Superultrawide 32:9 monitor. While using an old dock, thunderbolt 3 with a DP to HDMI cable worked for the most part, I was getting screen flickers, so I got a dock with native HDMI support to eliminate those issues, but no matter if I have my monitor set to 2.1 PC or 2.1AV for the connection type, I get the wrong resolutions... Either capped at 1920x1080 or 3840x2160... Neither of which my 5120x1440 monitor supports. I get no option of the correct resolution even though it worked fine (minus the flickering) on the old dock, and this new dock eliminated the flickering but I have such wrong resolutions.



Anyone else have a similar issue ? Has anyone at apple had anything similar happen ?


Thanks



[Re-Titled by Moderator]

Original Title: M5 Air -> Thunderbolt 4 Dock -> 32:9 does not display 5120x1440 monitor resolution in System Settings, stuck with either 1920x1080 or 4k letterboxed (even if monitor doesn't have 2160 vertical pixels ?)

Posted on Oct 6, 2026 4:18 PM

2 replies

WheelieNick
User level: Level 9 (74,110 points)

Oct 10, 2026 12:50 AM in response to theFiremanComing

If you do this, do you see these resolutions in the menu?

  • Open System Settings > Displays.
  • Select your LG 49" superultrawide display.
  • Hold down the Option key on your keyboard and click the Scaled radio button.
  • Alternatively, go to System Settings > Displays > Advanced and turn on Show resolutions as list / Show all resolutions.
  • Look through the expanded list for 5120 x 1440 and select it.



woodmeister50
User level: Level 7 (21,895 points)

Oct 10, 2026 5:48 AM in response to theFiremanComing

The issue seems to be one with the OWC dock and contact them as to whether their HDMI port on their dock supports ultra wide formats.

Originally posted at discussions.apple.com/thread/256371607