I just rechecked. Definitely seems to be dead. I can't even ping the Wyse after allowing more than normal time for it to boot.
Update:
I just compared the contents of the grub.cfg files for the prebuilt and my self compiled images written to the USB flash drives. (eg. openwrt-22.03.x-x86-64-generic-squashfs-combined-efi.img)
I removed the serial related parameters from the prebuilt grub.cfg. The resulting flash drive now boots on the Wyse 3040. Thank you to @frollic
Pre-built example grub.cfg found in image created by Owrt Firmware Selector.
serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1 --rtscts=off
terminal_input console serial; terminal_output console serial
set default="0"
set timeout="5"
search -l kernel -s root
menuentry "OpenWrt" {
linux /boot/vmlinuz root=PARTUUID=93ffdd41-3e4a-2ac5-91b9-53e979fb5902 rootwait console=tty0 console=ttyS0,115200n8 noinitrd
}
menuentry "OpenWrt (failsafe)" {
linux /boot/vmlinuz failsafe=true root=PARTUUID=93ffdd41-3e4a-2ac5-91b9-53e979fb5902 rootwait console=tty0 console=ttyS0,115200n8 noinitrd
}
Example of grub.cfg which successfully boots on Wyse 3040
set default="0"
set timeout="5"
search -l kernel -s root
menuentry "OpenWrt" {
linux /boot/vmlinuz root=PARTUUID=44d48e54-dcfb-b5b0-4fd1-e35f0fb71102 rootwait noinitrd
}
menuentry "OpenWrt (failsafe)" {
linux /boot/vmlinuz failsafe=true root=PARTUUID=44d48e54-dcfb-b5b0-4fd1-e35f0fb71102 rootwait noinitrd
}
ie. removing these parameters fixes the boot issue as mentioned by @980 in an old post.
console=tty0 console=ttyS0,115200n8
Update 2:
No improvement to the degraded speed issue when no monitor is connected, using prebuilt image.
I can confirm a cheap 4k HDMI dummy plug in conjunction with an existing 15cm long DP (male) to HDMI (female) pigtail adapter cable fixes the performance issue.
(I purchased another cheap 4k DP to HDMI pigtail adapter but it did not work with the Wyse despite looking almost identical to the adapter I have been using. The new adapter works perfectly with my old Dell Optiplex PC)
Update 3:
The cheap DisplayPort dummy plug finally turned up, from China. It works.
Dropbox link to my Wyse 3040 information resource
Update 4:
Scaling governor tweak and Realtek R8152 USB3 2.5GB nic by 'boerni667'.