I found another issue:
I tested KDE Neon Live DVD. It does not boot because the code checks additional
window attributes:
mov dx,[es:edi+2] ; win A/B attributes
and dx,707h
cmp dl,7
jz set_mode_50 ; win A is rw
It depends on VBE_WINDOW_ATTRIBUTE_RELOCATABLE.
The comment indicates that it needs only VBE_WINDOW_ATTRIBUTE_READABLE and
VBE_WINDOW_ATTRIBUTE_WRITEABLE.
Is the attribute VBE_WINDOW_ATTRIBUTE_RELOCATABLE required ?
It shows a splash screen and boots if I just advertise
VBE_WINDOW_ATTRIBUTE_RELOCATABLE without checking what's it's good for.
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https://bugs.launchpad.net/bugs/1530530
Title:
Installer doesn't show up on some Chromebooks: "Error setting up
gfxboot"
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https://bugs.launchpad.net/gfxboot-theme-ubuntu/+bug/1530530/+subscriptions
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