Arrrrgh. I had a ton typed in and it lost it. 
Summary: Openbox same thing. I launch any browser other than Chromium and I get nothing but a white page (Epiphany, luakit, surf, surfer).  I remove all config files and pare down xinitrc to nothing and same thing.
This is testing on aarch64 w/rpi4 kernel. I will duplicate it on armv7 and see how it goes. 
the xorg log shows this:
$this->bbcode_second_pass_code('', '[  4754.746]
X.Org X Server 1.20.10
X Protocol Version 11, Revision 0
[  4754.746] Build Operating System: Linux Arch Linux
[  4754.746] Current Operating System: Linux rune64 5.10.20-1-ARCH #1 SMP PREEMPT Fri Mar 5 05:40:43 MST 2021 aarch64
[  4754.746] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M@50,margin_left=48,margin_right=48,margin_top=48,margin_bottom=48 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  root=/dev/mmcblk0p2 rw rootwait console=tty3 selinux=0 plymouth.enable=0 fsck.repair=yes smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 kgdboc=ttyAMA0,115200 quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 vt.global_cursor_default=1 audit=0 snd_bcm2835.enable_compat_alsa=0 fbcon=map:10
[  4754.746] Build Date: 16 December 2020  11:52:03PM
[  4754.746]
[  4754.746] Current version of pixman: 0.40.0
[  4754.746]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[  4754.746] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  4754.747] (==) Log file: "/var/log/Xorg.0.log", Time: Mon Mar  8 20:08:49 2021
[  4754.747] (==) Using config directory: "/etc/X11/xorg.conf.d"
[  4754.747] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[  4754.748] (==) ServerLayout "slayo1"
[  4754.748] (**) |-->Screen "screen1" (0)
[  4754.748] (**) |   |-->Monitor "generic"
[  4754.748] (**) |   |-->Device "RpiFB"
[  4754.748] (**) |   |-->GPUDevice "Allwinner A10/A13 FBDEV"
[  4754.748] (==) Automatically adding devices
[  4754.749] (==) Automatically enabling devices
[  4754.749] (==) Automatically adding GPU devices
[  4754.749] (==) Automatically binding GPU devices
[  4754.749] (==) Max clients allowed: 256, resource mask: 0x1fffff
[  4754.749] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/misc".
[  4754.749]    Entry deleted from font path.
[  4754.749]    (Run 'mkfontdir' on "/usr/share/fonts/misc").
[  4754.749] (WW) The directory "/usr/share/fonts/TTF" does not exist.
[  4754.749]    Entry deleted from font path.
[  4754.749] (WW) The directory "/usr/share/fonts/OTF" does not exist.
[  4754.749]    Entry deleted from font path.
[  4754.749] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[  4754.749]    Entry deleted from font path.
[  4754.749] (WW) The directory "/usr/share/fonts/100dpi" does not exist.
[  4754.749]    Entry deleted from font path.
[  4754.749] (WW) The directory "/usr/share/fonts/75dpi" does not exist.
[  4754.749]    Entry deleted from font path.
[  4754.749] (==) FontPath set to:
[  4754.749] (==) ModulePath set to "/usr/lib/xorg/modules"
[  4754.749] (II) The server relies on udev to provide the list of input devices.
        If no devices become available, reconfigure udev or disable AutoAddDevices.
[  4754.749] (II) Module ABI versions:
[  4754.749]    X.Org ANSI C Emulation: 0.4
[  4754.749]    X.Org Video Driver: 24.1
[  4754.749]    X.Org XInput driver : 24.1
[  4754.749]    X.Org Server Extension : 10.0
[  4754.751] (--) using VT number 2
[  4754.752] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[  4754.754] (II) xfree86: Adding drm device (/dev/dri/card0)
[  4754.766] (II) no primary bus or device found
[  4754.766]    falling back to /sys/devices/platform/soc/soc:gpu/drm/card0
[  4754.766] (II) LoadModule: "glx"
[  4754.766] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  4754.772] (II) Module glx: vendor="X.Org Foundation"
[  4754.772]    compiled for 1.20.10, module version = 1.0.0
[  4754.772]    ABI class: X.Org Server Extension, version 10.0
[  4754.772] (II) LoadModule: "fbdev"
[  4754.773] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[  4754.773] (II) Module fbdev: vendor="X.Org Foundation"
[  4754.773]    compiled for 1.20.8, module version = 0.5.0
[  4754.773]    Module class: X.Org Video Driver
[  4754.773]    ABI class: X.Org Video Driver, version 24.1
[  4754.773] (II) FBDEV: driver for framebuffer: fbdev
[  4754.818] (WW) Falling back to old probe method for fbdev
[  4754.818] (II) Loading sub module "fbdevhw"
[  4754.818] (II) LoadModule: "fbdevhw"
[  4754.818] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[  4754.819] (II) Module fbdevhw: vendor="X.Org Foundation"
[  4754.819]    compiled for 1.20.10, module version = 0.0.2
[  4754.819]    ABI class: X.Org Video Driver, version 24.1
[  4754.819] (II) FBDEV(0): using default device
[  4754.819] (II) FBDEV(1): using /dev/fb0
[  4754.819] (EE) Screen 1 deleted because of no matching config section.
[  4754.819] (II) UnloadModule: "fbdev"
[  4754.819] (II) UnloadSubModule: "fbdevhw"
[  4754.819] (II) FBDEV(0): Creating default Display subsection in Screen section
        "screen1" for depth/fbbpp 16/16
[  4754.819] (==) FBDEV(0): Depth 16, (==) framebuffer bpp 16
[  4754.819] (==) FBDEV(0): RGB weight 565
[  4754.819] (==) FBDEV(0): Default visual is TrueColor
[  4754.819] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0)
[  4754.819] (II) FBDEV(0): hardware: vc4drmfb (video memory: 4050kB)
[  4754.819] (DB) xf86MergeOutputClassOptions unsupported bus type 0
[  4754.819] (**) FBDEV(0): Option "Rotate" "ROTATION_SETTING"
[  4754.819] (**) FBDEV(0): "ROTATION_SETTING" is not a valid value for Option "Rotate"
[  4754.819] (II) FBDEV(0): valid options are "CW", "CCW" and "UD"
[  4754.819] (II) FBDEV(0): checking modes against framebuffer device...
[  4754.819] (II) FBDEV(0): checking modes against monitor...
[  4754.819] (II) FBDEV(0): Virtual size is 1920x1080 (pitch 1920)
[  4754.819] (**) FBDEV(0):  Built-in mode "current"
[  4754.819] (==) FBDEV(0): DPI set to (96, 96)
[  4754.819] (II) Loading sub module "fb"
[  4754.819] (II) LoadModule: "fb"
[  4754.820] (II) Loading /usr/lib/xorg/modules/libfb.so
[  4754.820] (II) Module fb: vendor="X.Org Foundation"
[  4754.820]    compiled for 1.20.10, module version = 1.0.0
[  4754.820]    ABI class: X.Org ANSI C Emulation, version 0.4
[  4754.820] (**) FBDEV(0): using shadow framebuffer
[  4754.820] (II) Loading sub module "shadow"
[  4754.820] (II) LoadModule: "shadow"
[  4754.821] (II) Loading /usr/lib/xorg/modules/libshadow.so
[  4754.821] (II) Module shadow: vendor="X.Org Foundation"
[  4754.821]    compiled for 1.20.10, module version = 1.1.0
[  4754.821]    ABI class: X.Org ANSI C Emulation, version 0.4
[  4754.862] (==) FBDEV(0): Backing store enabled
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.862] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[  4754.863] (==) FBDEV(0): DPMS enabled
[  4754.863] (II) Initializing extension Generic Event Extension
[  4754.864] (II) Initializing extension SHAPE
[  4754.864] (II) Initializing extension MIT-SHM
[  4754.865] (II) Initializing extension XInputExtension
[  4754.865] (II) Initializing extension XTEST
[  4754.866] (II) Initializing extension BIG-REQUESTS
[  4754.866] (II) Initializing extension SYNC
[  4754.867] (II) Initializing extension XKEYBOARD
[  4754.867] (II) Initializing extension XC-MISC
[  4754.868] (II) Initializing extension SECURITY
[  4754.868] (II) Initializing extension XFIXES
[  4754.869] (II) Initializing extension RENDER
[  4754.869] (II) Initializing extension RANDR
[  4754.870] (II) Initializing extension COMPOSITE
[  4754.871] (II) Initializing extension DAMAGE
[  4754.871] (II) Initializing extension MIT-SCREEN-SAVER
[  4754.872] (II) Initializing extension DOUBLE-BUFFER
[  4754.872] (II) Initializing extension RECORD
[  4754.873] (II) Initializing extension DPMS
[  4754.873] (II) Initializing extension Present
[  4754.874] (II) Initializing extension DRI3
[  4754.874] (II) Initializing extension X-Resource
[  4754.874] (II) Initializing extension XVideo
[  4754.875] (II) Initializing extension XVideo-MotionCompensation
[  4754.875] (II) Initializing extension GLX
[  4754.875] (II) AIGLX: Screen 0 is not DRI2 capable
[  4755.087] (II) IGLX: Loaded and initialized swrast
[  4755.087] (II) GLX: Initialized DRISWRAST GL provider for screen 0
[  4755.087] (II) Initializing extension XFree86-VidModeExtension
[  4755.088] (II) Initializing extension XFree86-DGA
[  4755.088] (II) Initializing extension XFree86-DRI
[  4755.088] (II) Initializing extension DRI2
[  4755.204] (II) config/udev: Adding input device stmpe-ts (/dev/input/event1)
[  4755.204] (**) stmpe-ts: Applying InputClass "libinput touchscreen catchall"
[  4755.204] (**) stmpe-ts: Applying InputClass "Touchscreen"
[  4755.204] (**) stmpe-ts: Applying InputClass "STMPE Touchscreen Calibration"
[  4755.204] (**) stmpe-ts: Applying InputClass "Touchscreen"
[  4755.204] (II) LoadModule: "libinput"
[  4755.204] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so
[  4755.216] (II) Module libinput: vendor="X.Org Foundation"
[  4755.216]    compiled for 1.20.8, module version = 0.30.0
[  4755.216]    Module class: X.Org XInput Driver
[  4755.216]    ABI class: X.Org XInput driver, version 24.1
[  4755.216] (II) Using input driver 'libinput' for 'stmpe-ts'
[  4755.216] (**) stmpe-ts: always reports core events
[  4755.216] (**) Option "Device" "/dev/input/event1"
[  4755.216] (**) Option "_source" "server/udev"
[  4755.225] (II) event1  - stmpe-ts: is tagged by udev as: Touchscreen
[  4755.226] (II) event1  - stmpe-ts: device is a touch device
[  4755.226] (II) event1  - stmpe-ts: device removed
[  4755.268] (**) Option "CalibrationMatrix" "MATRIX_SETTING"
[  4755.268] (EE) libinput: stmpe-ts: Invalid matrix: MATRIX_SETTING, using default
[  4755.268] (**) Option "config_info" "udev:/sys/devices/platform/soc/3f204000.spi/spi_master/spi0/spi0.1/stmpe-ts/input/input1/event1"
[  4755.268] (II) XINPUT: Adding extended input device "stmpe-ts" (type: TOUCHSCREEN, id 6)
[  4755.268] (**) Option "AccelerationScheme" "none"
[  4755.268] (**) stmpe-ts: (accel) selected scheme none/0
[  4755.268] (**) stmpe-ts: (accel) acceleration factor: 2.000
[  4755.268] (**) stmpe-ts: (accel) acceleration threshold: 4
[  4755.268] (**) Option "TransformationMatrix" "-0.0248935541253287 1.09282702610193 -0.0144207581124463 -1.1093457416975 -0.00769191962656198 1.05433612679797 0 0 1"
[  4755.273] (II) event1  - stmpe-ts: is tagged by udev as: Touchscreen
[  4755.274] (II) event1  - stmpe-ts: device is a touch device
[  4755.277] (II) config/udev: Adding input device stmpe-ts (/dev/input/mouse0)
[  4755.277] (II) No input driver specified, ignoring this device.
[  4755.277] (II) This device may have been added with another device file.
[  4755.279] (II) config/udev: Adding input device vc4 (/dev/input/event0)
[  4755.279] (**) vc4: Applying InputClass "libinput keyboard catchall"
[  4755.279] (II) Using input driver 'libinput' for 'vc4'
[  4755.279] (**) vc4: always reports core events
[  4755.279] (**) Option "Device" "/dev/input/event0"
[  4755.279] (**) Option "_source" "server/udev"
[  4755.282] (II) event0  - vc4: is tagged by udev as: Keyboard Pointingstick
[  4755.283] (II) event0  - vc4: device is a pointer
[  4755.283] (II) event0  - vc4: device is a keyboard
[  4755.283] (II) event0  - vc4: device removed
[  4755.296] (II) libinput: vc4: needs a virtual subdevice
[  4755.296] (**) Option "config_info" "udev:/sys/devices/platform/soc/3f902000.hdmi/rc/rc0/input0/event0"
[  4755.296] (II) XINPUT: Adding extended input device "vc4" (type: MOUSE, id 7)
[  4755.296] (**) Option "AccelerationScheme" "none"
[  4755.296] (**) vc4: (accel) selected scheme none/0
[  4755.296] (**) vc4: (accel) acceleration factor: 2.000
[  4755.296] (**) vc4: (accel) acceleration threshold: 4
[  4755.299] (II) event0  - vc4: is tagged by udev as: Keyboard Pointingstick
[  4755.300] (II) event0  - vc4: device is a pointer
[  4755.300] (II) event0  - vc4: device is a keyboard
[  4755.304] (II) config/udev: Adding input device Logitech USB Optical Mouse (/dev/input/event5)
[  4755.304] (**) Logitech USB Optical Mouse: Applying InputClass "libinput pointer catchall"
[  4755.304] (II) Using input driver 'libinput' for 'Logitech USB Optical Mouse'
[  4755.304] (**) Logitech USB Optical Mouse: always reports core events
[  4755.304] (**) Option "Device" "/dev/input/event5"
[  4755.304] (**) Option "_source" "server/udev"
[  4755.310] (II) event5  - Logitech USB Optical Mouse: is tagged by udev as: Mouse
[  4755.310] (II) event5  - Logitech USB Optical Mouse: device is a pointer
[  4755.311] (II) event5  - Logitech USB Optical Mouse: device removed
[  4755.348] (**) Option "config_info" "udev:/sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.3/1-1.1.3:1.0/0003:046D:C077.0003/input/input8/event5"
[  4755.348] (II) XINPUT: Adding extended input device "Logitech USB Optical Mouse" (type: MOUSE, id 8)
[  4755.348] (**) Option "AccelerationScheme" "none"
[  4755.348] (**) Logitech USB Optical Mouse: (accel) selected scheme none/0
[  4755.348] (**) Logitech USB Optical Mouse: (accel) acceleration factor: 2.000
[  4755.348] (**) Logitech USB Optical Mouse: (accel) acceleration threshold: 4
[  4755.354] (II) event5  - Logitech USB Optical Mouse: is tagged by udev as: Mouse
[  4755.354] (II) event5  - Logitech USB Optical Mouse: device is a pointer
[  4755.358] (II) config/udev: Adding input device Logitech USB Optical Mouse (/dev/input/mouse1)
[  4755.358] (II) No input driver specified, ignoring this device.
[  4755.358] (II) This device may have been added with another device file.
[  4755.382] (**) vc4: Applying InputClass "libinput keyboard catchall"
[  4755.382] (II) Using input driver 'libinput' for 'vc4'
[  4755.382] (**) vc4: always reports core events
[  4755.382] (**) Option "Device" "/dev/input/event0"
[  4755.382] (**) Option "_source" "_driver/libinput"
[  4755.382] (II) libinput: vc4: is a virtual subdevice
[  4755.383] (**) Option "config_info" "udev:/sys/devices/platform/soc/3f902000.hdmi/rc/rc0/input0/event0"
[  4755.383] (II) XINPUT: Adding extended input device "vc4" (type: KEYBOARD, id 9)
[  4821.345] (II) event1  - stmpe-ts: device removed
[  4821.405] (II) event5  - Logitech USB Optical Mouse: device removed
[  4821.440] (II) event0  - vc4: device removed
[  4821.482] (II) UnloadModule: "libinput"
[  4821.483] (II) UnloadModule: "libinput"
[  4821.483] (II) UnloadModule: "libinput"
[  4821.483] (II) UnloadModule: "libinput"
[  4821.556] (II) Server terminated successfully (0). Closing log file.')
			
		