Radeon 3450 HD AGP Apperature Size set to 128MB causes the screen to get stuck

Sat Apr 30 19:37:07 UTC 2022

I have Radeon 3450 HD AGP on the PC. The Load Optimized Defaults in the BIOS sets the AGP Aperature Size in BIOS -> Advanced Chipset Features -> AGP Timing Control -> AGP Aperture Size to 128MB, but then the screen gets scrambled during boot and it's stuck. Nothing works and the PC needs to be restarted.
Changing the AGP Aperture Size to 64MB or 256MB results in the boot, and the desktop GUI loading. There is a short 1-2 screen corruption during the desktop loading, but it's quickly cleared and the PC is usable.

An image of the scrambled screen: https://i.imgur.com/exnOGHQ.jpg
[https://i.imgur.com/exnOGHQ.jpg]

An image of a scrambled screen that can appear too, sometimes by using a boot from Live USB:

https://i.imgur.com/D8AybDm.jpg
[https://i.imgur.com/D8AybDm.jpg]

$ inxi -V
inxi 3.3.06-00 (2021-07-21)

$ inxi -GSa
System:    Host: mx Kernel: 5.10.0-13-amd64 x86_64 bits: 64 compiler: gcc v: 10.2.1
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.10.0-13-amd64 root=UUID=a5394d26-7d32-4cf2-8464-5d84ff345900 ro quiet splash
           Desktop: Xfce 4.16.0 tk: Gtk 3.24.24 info: xfce4-panel wm: xfwm 4.16.1 vt: 7 dm: LightDM 1.26.0
           Distro: MX-21.1_x64 Wildflower April 9  2022 base: Debian GNU/Linux 11 (bullseye)
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] RV620 LE [Radeon HD 3450 AGP] vendor: PC Partner Limited driver: radeon
           v: kernel bus-ID: 01:00.0 chip-ID: 1002:95c6 class-ID: 0300
           Display: x11 server: X.Org 1.20.11 compositor: xfwm4 v: 4.16.1 driver: loaded: ati,radeon
           unloaded: fbdev,modesetting,vesa display-ID: :0.0 screens: 1
           Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") s-diag: 582mm (22.9")
           Monitor-1: HDMI-0 res: 1920x1080 hz: 60 dpi: 94 size: 521x293mm (20.5x11.5") diag: 598mm (23.5")
           OpenGL: renderer: AMD RV620 (DRM 2.50.0 / 5.10.0-13-amd64 LLVM 11.0.1) v: 3.3 Mesa 20.3.5 compat-v: 3.0
           direct render: Yes

$ inxi -Fxxxrz
System:    Kernel: 5.10.0-13-amd64 x86_64 bits: 64 compiler: gcc v: 10.2.1 Desktop: Xfce 4.16.0
           tk: Gtk 3.24.24 info: xfce4-panel wm: xfwm 4.16.1 vt: 7 dm: LightDM 1.26.0
           Distro: MX-21.1_x64 Wildflower April 9  2022 base: Debian GNU/Linux 11 (bullseye)
Machine:   Type: Desktop Mobo: MSI model: MS-7032 v: 1.0 serial: <filter>
           BIOS: American Megatrends v: 080011 date: 07/26/2005
CPU:       Info: Single Core model: AMD Sempron 2600+ bits: 64 type: UP arch: K8 rev: 0 cache:
           L2: 128 KiB
           flags: lm nx pae sse sse2 bogomips: 3200
           Speed: 1600 MHz min/max: N/A Core speed (MHz): 1: 1600
Graphics:  Device-1: AMD RV620 LE [Radeon HD 3450 AGP] vendor: PC Partner Limited driver: radeon
           v: kernel bus-ID: 01:00.0 chip-ID: 1002:95c6 class-ID: 0300
           Display: x11 server: X.Org 1.20.11 compositor: xfwm4 v: 4.16.1 driver:
           loaded: ati,radeon unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz
           s-dpi: 96
           OpenGL: renderer: AMD RV620 (DRM 2.50.0 / 5.10.0-13-amd64 LLVM 11.0.1)
           v: 3.3 Mesa 20.3.5 compat-v: 3.0 direct render: Yes
Audio:     Device-1: VIA VT8233/A/8235/8237 AC97 Audio vendor: Micro-Star MSI
           driver: snd_via82xx v: kernel bus-ID: 00:11.5 chip-ID: 1106:3059 class-ID: 0401
           Sound Server-1: ALSA v: k5.10.0-13-amd64 running: yes
           Sound Server-2: PulseAudio v: 14.2 running: yes
Network:   Device-1: VIA VT6102/VT6103 [Rhine-II] vendor: Micro-Star MSI driver: via-rhine
           v: N/A port: c000 bus-ID: 00:12.0 chip-ID: 1106:3065 class-ID: 0200
           IF: eth0 state: down mac: <filter>
Drives:    Local Storage: total: 111.79 GiB used: 5.68 GiB (5.1%)
           ID-1: /dev/sda vendor: Samsung model: SSD 840 EVO 120GB size: 111.79 GiB
           speed: <unknown> type: SSD serial: <filter> rev: AB0Q scheme: MBR
Partition: ID-1: / size: 106.51 GiB used: 5.68 GiB (5.3%) fs: ext4 dev: /dev/sda1
Swap:      ID-1: swap-1 type: partition size: 3 GiB used: 0 KiB (0.0%) priority: -2
           dev: /dev/sda2
Sensors:   System Temperatures: cpu: 49.0 C mobo: N/A gpu: radeon temp: 66.0 C
           Fan Speeds (RPM): N/A
Repos:     Packages: note: see --pkg apt: 1991
           No active apt repos in: /etc/apt/sources.list
           Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list
           1: deb http://deb.debian.org/debian bullseye-updates main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/debian.list
           1: deb http://deb.debian.org/debian bullseye main contrib non-free
           2: deb http://security.debian.org/debian-security bullseye-security main contrib non-free
           Active apt repos in: /etc/apt/sources.list.d/mx.list
           1: deb https://mirrors.netix.net/mx/MX-Packages/mx/repo/ bullseye main non-free
Info:      Processes: 173 Uptime: 2m wakeups: 55 Memory: 1.94 GiB used: 698.9 MiB (35.2%)
           Init: SysVinit v: 2.96 runlevel: 5 default: 5 Compilers: gcc: 10.2.1 alt: 10
           Shell: Bash v: 5.1.4 running-in: xfce4-terminal inxi: 3.3.06
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