screen keep on deactivate at boot

Brief summary of the problem:

I don't use any Display Manager, I usually log in from TTY, and start X if needed. Since 6.11 kernel's upgrade every time I boot after few lines the screen goes black, then the screen deactivates, and never wakes up again (even when I start X). the system is fine : I can log in with ssh, everything seems OK (except "dead" screen).

Hardware description:

• CPU: Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz
• GPU: 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM] [1002:6778]
• Display(s): an "old" PackardBell screen (I don't find any reference front and back)
• Type of Display Connection: HDMI

System information:

• Distro name: Arch linux
• Kernel version: Linux OptiPlex790 6.6.56-1-lts #1 (closed) SMP PREEMPT_DYNAMIC Thu, 10 Oct 2024 12:04:53 +0000 x86_64 GNU/Linux
• Custom kernel: drm-tip-git

How to reproduce the issue:

boot on 6.11 kernel or drm-tip-git kernel

Attached files:

here are the latest journals (journalctl -b)

6.11.3 kernel : http://0x0.st/X6_X.txt

drm-tip-git kernel : http://0x0.st/XIQO.txt

and here's the discussion I had on bbs.archlinux.org : https://bbs.archlinux.org/viewtopic.php?id=299945