Kernel 6.7 breaks 4K & 100 Hz+ (DP loses signal)

Steps to reproduce (always):

1. Once Wayland tries to switch to the higher Hz modes (either directly or from 60 Hz), the monitor will lose signal.

Notes:

• Broken from: Kernel 6.7 (currently 6.7.2)
• Last known good: Kernel 6.6.14
• Running Wayland in 60 Hz still works fine.
• No crashes (graphical programs keep running) nor errors at standard loglevel

Broken modes (monitor reports lost signal):

• 3840x2160 @ 100 Hz/120 Hz/143.988 Hz

Working (the two next less demanding modes):

• 3840x2160 @ 60.000 Hz
• 2560x1440 @ 119.998 Hz

Setup:

• DP-1 to IGP (w/ Sway 1.8.1, wlroots 0.17.1)
• HP OMEN 27u
• ASUS B660-G (Bios 3010)
• Intel Corporation Raptor Lake-S GT1 [UHD Graphics 770] (rev 04) [i7-13700K]

uname -srvmo:

Linux 6.7.2-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 26 Jan 2024 19:10:20 +0000 x86_64 GNU/Linux

lspci -vnn -d ':*:0300':

0000:00:02.0 VGA compatible controller [0300]: Intel Corporation Raptor Lake-S GT1 [UHD Graphics 770] [8086:a780] (rev 04) (prog-if 00 [VGA controller])
DeviceName: Onboard - Video
Subsystem: ASUSTeK Computer Inc. Raptor Lake-S GT1 [UHD Graphics 770] [1043:8694]
Flags: bus master, fast devsel, latency 0, IRQ 126
Memory at 6016000000 (64-bit, non-prefetchable) [size=16M]
Memory at 4000000000 (64-bit, prefetchable) [size=256M]
I/O ports at 6000 [size=64]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915

dmesg_excerpt.tar.xz: drm.debug=0xe log_buf_len=4M ignore_loglevel dmesg parts after Wayland was already started at 60 Hz (I set the refresh rate to 120 Hz with wdisplays, switched to a root VT, and ran dmesg again).

PS: If possible, could you please tell me where to report a system breaking Intel ethernet (I225-V) bug? I already tried the Kernel bugzilla half a year ago, but despite my repeated requests nobody ever responded.