Report that '4K / 144Hz screen output is no longer possible from macOS Big Sur via eGPU'
MacOS Big Sur, which made a major major update for the first time in 20 years, was released on November 13, 2020, and version 11.1 was delivered on December 14, 2020. However, in macOS Big Sur, a bug that 'cannot output to a 4K / 144Hz monitor'
4k @ 144Hz no longer available after upgrade to Big Sur | Thunderbolt macOS eGPU
https://egpu.io/forums/mac-setup/4k144hz-no-longer-available-after-upgrade-to-big-sur/
An eGPU is an external GPU that can be built into a Thunderbolt 3 connected casebox. If the Mac is also an AMD GPU, it can be externally attached as an eGPU, and by connecting an external display, high-performance graphics can be realized even on mobile terminals such as MacBook.
Red_Epicness, a member of egpu.io , said that the 15-inch MacBook Pro released in 2018 was output to the monitor via the external Radeon RX 5700 mounted on the AkiTiO Node Pro. In addition, the monitor used is LG's 27GN950-B, which supports a display resolution of 4K, a refresh rate of up to 144Hz, 10-bit color x 3 colors, and DisplayHDR 600 . In addition, both the GPU and monitor support Lossy Compression Display Stream Compression (DSC), so Red_Epicness was able to use it at the highest setting of 4K / 144Hz (with HDR) in the macOS Catalina environment. is.
However, since Red_Epicness updated the MacBook Pro's OS to macOS Big Sur in November 2020, monitor output has been limited to either 4K / 60Hz (with HDR) or 4K / 95Hz (without HDR). It seems that it has been done. Also, when the DSC was turned off and the monitor was switched to the normal Display Port input, it was output at 4K / 120Hz (without HDR).
TiM, who is also a member of egpu.io , received a report from Red_Epicness and tried it on his 16-inch MacBook Pro. It seems that the screen output has been limited to 98Hz. TiM, who is also the developer of the iOS application, reported to Apple about this screen output bug.
However, it seems that this phenomenon was not cured at all in Mr. TiM's environment even in version 11.1 beta 2 of macOS Big Sur released on December 4. On the contrary, the resolution changed greatly every time the Thunderbolt 3 cable was plugged in and unplugged, and in some cases it was output at 800 x 600 resolution. Also, TiM reports that the output was only once at 4K resolution and the frame rate was limited to 60Hz.
'Since macOS Big Sur
It seems that there are other people who have submitted a report similar to Mr. TiM, and there is also a report that 'the noise volume of the eGPU fan has increased since macOS Big Sur'.
Tanmay, who also submitted a report to Apple, said, 'I also reported this issue, and I've seen on reddit and egpu.io that there are many others who have reported it. This is good, the same. With more people submitting bug reports, Apple's priority list goes up. '
In addition, tanmay said that installing and checking the official version of version 11.1 released on December 15, 2020 did not fix this problem. I was expecting it because the release note said 'The bug of LG 5K display was fixed', but it seems that the problem that the frame rate is limited for some reason was not solved after all.
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