DOS and/or WIN-OS/2 Sessions Problems on ArcaOS

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Arca Noae has comment on their website that this is a common issue running ArcaOS (OS/2) on modern hardware. [1]. It says "Generally, this is due to an incompatibility in the BIOS of the system with the DOS VDM code in ArcaOS (inherited from IBM’s OS/2 Warp 4)."

DOS window mode shows wrongly

This is a problem found on a Thinkpad L420. DOS and Win-OS2 works fine in fullscreen, Win-OS2 also works fine on window mode, but DOS on window mode shows wrong/group/superimposed characters on the command line.

Like this image:

Error on DOS session on ArcaOS 5.0.3

Commands on the DOS will work, like for example "exit" will close the window, but the characters just don't look right.

It was suggested to use:

DEVICE=X:\OS2\MDOS\VSVGA.SYS /int10textgrfxsafe

But on this case /int10textgrfxsafe does not solve the problem.

Workarround
Arca Noae offers this workaround "Another option, when full screen sessions work but windowed ones do not, is to open a full screen session first, and then press Alt-Home to switch it to a windowed session (this only works for DOS sessions, not OS/2 full screen and windowed sessions)."
That is a good tricked that worked on the Thinkpad L420.
Patch
There is an experimental patch on which Arca Noae had been working - vio-1.0.wpi. You can find it on Arca Noae Ticket system. Ticket 1193