Hi Folks!
I’m fairly new to both this forum & UEFI modding at general, so please excuse me if I post in wrong category or something that’s simply boring but I “hit a wall” with following problem.
I’ve recently received mainboard (AIA30 LA-C761P Rev. 1.0), which is from Lenovo S200z AIO, construction based on Pentium J3710 CPU, of course without internally connected display (LVDS kind), entire platform is running on AMI powered UEFI. Board itself is working. After pressing random function keys blindly, it’s ultimately able to boot into Linux but no efi folder can’t be found anywhere in /sys/firmware directory. Worth mentioning is there’s no way to boot any kind of windows, neither windows 10 (with proper display drivers installed) nor specially crafted PE, apparently something is going-on during boot-up process but there’s no way to tell since display isn’t shown at all on externally connected HDMI port.
As far as I know, there should be a possibility to set HDMI display as primary one but all my efforts so far went in vain.
I’ve extracted UEFI directly from chip, to my surprise it contains two volumes with same NVRAM variables (they seems to be duplicated)
There’s whole bunch of variables, lots of them are links, some of them are even indicated as “invalid” & they are duplicated in second volume as well.
I don’t know if someone was messing-up with this system before me, this is however a capture from moment when I get my hands on it (BTW…I’m sorry, that I’m not posting a bin file itself, however I can’t disclose it).
Using ifrextractor I was able to pull-out relevant data, especially variable addresses.
According to them data, I’ve tried to modify Setup variable (in both folders), by turning-off LVDS, setting EFP1 as primary display (that should be a HDMI port, if data obtained from GOP driver are valid), but nothing seems to work. Computer still won’t display POST on external display, it behaves like… no changes to Setup were made at all.
I don’t know at this point, am I missing something? Am I doing something wrong? - I’m must admit, I feel a little bit defeated.