So I got a Samsung CRG9 (so no usb-c/tb3 that I know works with adapters, just HDMI or DP)
Anyway, originally I tried HDMI couldn't find a working display port to many display port adapter and HDMI would max out 3840x1080
so I got a new mini display port to display port adapter thinking match solve it because most of the people who had the same problem with HDMI mentioned it needed to be display port... fair enough.
anyway I'm sad to find out that even with display port the max resolution it wants me to use is 3840x1080.
I can force it ( either via SwitchResX or holding option on the scaled button) to try to use its native 5120x1440 but it comes out looking blocky (had to take the picture for my phone, screenshots and video capture show up like it should)
I'm guessing this is because I think the 2015 rmbp is the display port 1.2? and they only really started officially claiming support for other resolutions above that with 1.4 which came out in 2016 so it's definitely not on a 2015 MacBook.
that said it would surprise me regardless, because 5120x1440 is fewer pixels than 4K and I can drive a 4K monitor with display port just fine.
I know using my EGPU it can output correctly but right now I have that attached my iMac doing some work so that's not an option plus thunderbolt is not display port despite sharing the port.
so yeah I'm hoping to find a solution that I don't require my EGPU box when really the graphics are required.
so far the only "solution" I have is because the monitor supports dual outputs splitting itself in the literal 2* 2560x1440 I can run it like that and it just requires either 2 mini display port cables or one mini display port and HDMI and the only major downside is the menu bar and dock act like it's a multi-monitor set up (because it is) which is slightly less elegant than when it's a single big display.
is my workaround the only workaround? is this normal behaviour for that resolution on this era of Mac? I'm open to any other suggestions.
Anyway, originally I tried HDMI couldn't find a working display port to many display port adapter and HDMI would max out 3840x1080
so I got a new mini display port to display port adapter thinking match solve it because most of the people who had the same problem with HDMI mentioned it needed to be display port... fair enough.
anyway I'm sad to find out that even with display port the max resolution it wants me to use is 3840x1080.
I can force it ( either via SwitchResX or holding option on the scaled button) to try to use its native 5120x1440 but it comes out looking blocky (had to take the picture for my phone, screenshots and video capture show up like it should)
I'm guessing this is because I think the 2015 rmbp is the display port 1.2? and they only really started officially claiming support for other resolutions above that with 1.4 which came out in 2016 so it's definitely not on a 2015 MacBook.
that said it would surprise me regardless, because 5120x1440 is fewer pixels than 4K and I can drive a 4K monitor with display port just fine.
I know using my EGPU it can output correctly but right now I have that attached my iMac doing some work so that's not an option plus thunderbolt is not display port despite sharing the port.
so yeah I'm hoping to find a solution that I don't require my EGPU box when really the graphics are required.
so far the only "solution" I have is because the monitor supports dual outputs splitting itself in the literal 2* 2560x1440 I can run it like that and it just requires either 2 mini display port cables or one mini display port and HDMI and the only major downside is the menu bar and dock act like it's a multi-monitor set up (because it is) which is slightly less elegant than when it's a single big display.
is my workaround the only workaround? is this normal behaviour for that resolution on this era of Mac? I'm open to any other suggestions.
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