4K@30 video output does not work properly on Pinebook Pro

I have Pinebook Pro connected to LG 27UD88-W monitor via USB-C to DisplayPort cable. I'm running Manjaro ARM 21.06 (Linux kernel 5.12) with Sway WM. The problem is that I can't run 4K @ 30Hz properly (right 1/3 of the screen is distorted). FullHD (1920 x 1080) and WQHD (2560 x 1440) works just fine. I have also tested X11 based Linux distros and the issue is the same. Anybody had luck to run 4K @ 30Hz video output on the external monitor?

This is the similiar thread, but it is closed.

I will be more than happy to provide more details if necessary.

$ dmesg | grep cdn-dp
[    5.395293] cdn-dp fec00000.dp: Direct firmware load for rockchip/dptx.bin failed with error -2
[    5.395302] cdn-dp fec00000.dp: Falling back to sysfs fallback for: rockchip/dptx.bin
[   69.610270] cdn-dp fec00000.dp: [drm:cdn_dp_request_firmware [rockchipdrm]] *ERROR* failed to request firmware: -11
[  101.919603] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work [rockchipdrm]] Connected, not enabled. Enabling cdn
[  549.569829] cdn-dp fec00000.dp: [drm:cdn_dp_check_sink_connection [rockchipdrm]] *ERROR* Get sink capability timed out
[  549.570998] cdn-dp fec00000.dp: [drm:cdn_dp_encoder_enable [rockchipdrm]] *ERROR* Failed to enable encoder -19

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