Just talked to DJI support. They told me that EV not working in aperture/shutter priority or auto in DLOG is normal.......
Did you not read the link I posted? EV is locked at 2.3
4. Native ISO
Usually, when applying the analog gain 1x and LOG gamma, we say the equivlent ISO is called native ISO.
After applying the DLOG which has been well tuned to match 12.8 fstops, the 18% gray is 2.3 fstops above the normal gamma. Do you remember the exposure is mostly responsible for the 18% gray? Therefore, the exposure should be reduced 2.3ev in order to match the aperture/shutter of other cameras. In our case,
native ISO = Baseline ISO + 2.3ev = ISO500.
That means use the same aperture/shutter/iso, we will make the brightness of 18% gray be aligned with any cameras, no matter for photo or for cinema.