As a tiny and probably unimportant side note, I'd like to mention that in modern notebooks, the row of F-keys tends to come configured (via the BIOS setup) to respond to the "alternate Fn function" primarily, without using the Fn modifier key. I.e., on such a machine ex works, you'd need to press just F2, rather than Fn+F2.
> It is possible that instead of letting the BIOS do that job, > the hotkey is actually linked to some low-level steps which > are defined in the ACPI data. So in theory, you can use some > tool of your choice to disassemble that and then follow your > intuition to find the right search terms to find that machine > readable explanation of how screens are switched. apt-get install acpica-tools acpidump -b -n DSDT -z mv dsdt.dat dsdt.aml iasl dsdt.aml >From there, I'm at my wits end once again. Gabriel: thumbs up for your valiant efforts with debug.exe, but you probably cannot hope for that much luck. The router of video outputs is actually growing more complex with every generation of Intel IGP's. The ATOM N270 isn't exactly young, but it's not some simple ancient hardware either. Its IGP contains several "signal chains" consisting of CRT's and output ports and possibly scalers and whatnot, the bank of config registers is probably memory-mapped somewhere outside of the space you can reach in plain DOS, you'd possibly need to "ioremap" the memory using e.g. DPMI, and then know exactly what to poke and how. Possibly including video mode timings (geometry details). Unfortunately I cannot find any hints that VESA VBE would have a function to switch outputs... Frank Frank _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
