Ok guys, I will do it . Ok, tomorrow morning I will send it ( here is time to sleep now ), and I will send it to anyone who wants help. To be honest, this is a huge challenge for me . I have some knowledge on ASM,C , MSDOS ( int21 calls ...) and now I'm studying a book about how to develop a kernel , but this task is huge for me and I have no idea about how to find the instructions related to enabling external VGA, but if somebody found a solution I will study it. Thank you guys !!
Maybe you can create a C program called "VgaExtON.exe" , put it on the autoexec.bat and the screen will turn on automatically. apt-get install acpica-tools acpidump -b -n DSDT -z mv dsdt.dat dsdt.aml iasl dsdt.aml *Gabriel González González* El mié, 9 oct 2024 a las 22:31, Frantisek Rysanek via Freedos-user (< freedos-user@lists.sourceforge.net>) escribió: > 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 >
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