On Fri, 09 Sep 2022, "Aurélien" <aurelien.intel@xxxxxxxx> wrote: > But since this display is independent from the GPU i didn't want to > link both code. If it's eDP and uses some proprietary DPCD brightness control mechanism, I think in practice it usually is somewhat dependent on the GPU. (OTOH I realize you don't mention eDP. If it's not eDP, DDC/CI is the more likely way to control brightness than DPCD.) > For sure. It's an OLED display. Thus there is no backlight. It uses > specific registers to control the brightness of the screen. As Lyude said, we have a bunch of "backlight" terminology for historical reasons, but basically the DP aux, or DPCD, brightness control is mostly agnostic to the display technology. > Unfortunately I guess the mechanism is not shared with many OLED > displays... Do you have a spec for it? How does it differ from the VESA eDP DPCD brightness control? BR, Jani. -- Jani Nikula, Intel Open Source Graphics Center
