Given the fact that OS/2.11 -- without fixpacks -- has only a 640x400 resolution due to the scarcity of video drivers, at Metztli Information Technology we decided to upgrade the OS to what IBM termed as OS/2 Warp 4 Advanced Server with SMP.
Actually, nevertheless, it is OS/2 Warp 3 on steroids (without the negative effects associated with humans ;-). I subsequently applied the fixpack 43 to the base system and upgraded the MPTS stack. Oh, indeed, fixpack 43 satisfied the IBM Gradd 97 video driver requirements to provide a 1024x768 video resolution shown. [Thank you to Hobbes OS/2 Archive]