Well, I don’t have a Raspberry PI anymore and neither any less, so this is just a shot in the dark.
Are you sure it’s not overheating?
It should help to troubleshoot the problem if you try booting with the settings that doesn’t work, switch it off, change it back to working settings, boot up and check the logs. Or something like that.
Edit:
Because along with overclocking usually comes overheating.
I’ve gone through it I can’t even overclock only CPU to 1600MHz and I’ve got the aluminum armor heat-sink case with dual fan.
It is less likely to be overheating.
Tried dropping this to 5?
Yes.
Tried 3,4,5
Got a question where are the boot logs ?
So I can give more precise details or even make it more googlable.
# overclocking
over_voltage=6
arm_freq=1800
#v3d_freq=600
#isp_freq=700
#h264_freq=700
hdmi_enable_4kp60=1
#core_freq=600
#core_freq_min=600
I recently removed gpu overclocking due to a change in the 5.12 kernel.
I assume you removed the overclocking and it booted correctly. Just bump up the overclocking in increments until you find what works for your system.
GPU overclock is far more important to me than CPU overclock. Since I use it as a home media player.
Can you provide me a link to the changes you mentioned ?
And do you think that if I use the older kernel, I may use the overclock ?
I just migrated from Raspbian to get rid of really old software releases on debian.
If you are using fkms, then you should be fine with the 5.12 kernel.
Nope fkms didn’t work for me, even with GPU clock set to 630 
Does it boot without overclocking?
Update:
I overclocked my RPi 4 on Plasma Bigscreen too!
Hence there’s not a problem on overclocking the 64 bit architecture.
Update: I can overclock Manjaro Minimal too but not with any DE.
Since you continue to have issues, I turned gpu overclocking back on to make sure it still works for me. And so far, I have no issues.
Current config.txt:
# See /boot/overlays/README for all available options
# kernel
initramfs initramfs-linux.img followkernel
kernel=kernel8.img
# cpu/gpu
arm_64bit=1
gpu_mem=64
# overclocking
over_voltage=6
arm_freq=2000
gpu_freq=700
#v3d_freq=600
#isp_freq=700
#h264_freq=700
#hdmi_enable_4kp60=1
#core_freq=600
#core_freq_min=600
# sound
dtparam=audio=on
hdmi_drive=2
# display
disable_overscan=1
max_framebuffers=2
#disable_splash=1
# vc4
dtoverlay=vc4-fkms-v3d,cma-384
#dtoverlay=vc4-kms-v3d,cma-384
# 4K@30Hz
#hdmi_group=1
#hdmi_mode=95
# 4K@60Hz
#hdmi_group=1
#hdmi_mode=97
# gpio
#enable_uart=1
#dtparam=i2c_arm=on
#dtparam=i2c1=on
dtoverlay=argonone
dtparam=fantemp0=45
dtparam=fanspeed0=33
dtparam=fantemp1=50
dtparam=fanspeed1=66
dtparam=fantemp2=55
dtparam=fanspeed2=100
dtparam=hysteresis=3
# bluetooth
dtoverlay=disable-bt
# wifi
dtoverlay=disable-wifi
Edit: I initially failed to comment out hdmi_enable_4kp60=1, which sets the gpu_freq to 550. I commented the line and rebooted, now at 700 MHz and working properly.
Edit 2: I increased the cpu _freq=2147 and gpu_freq=750, the maximum supported values, works fine.
Edit 3: Eh, my Rpi4 locks up on youttube at max, but 2000 and 700 works fine.
Is this with or without xf86-video-fbturbo-git installed?
The only change I needed to make was adding cma-384 to the dtoverlay.
Don’t know why it was needed, but it worked.
Thanks to @0n0w1c
The cma value can go as high as 512, if needed. It allocates video memory for the gpu.
Thank you
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