07:02 <clfbbn> I found that the kernel provides a brightness of 4096 steps from /sys/class/backlight/panel0-backlight/max_brightness. However, I tried to decompile the frameworkres overlays and the config_screenBrightnessBacklight only ranges from 0-255, causing the display panel too dark..

08:36 <LuK1337> uh. you don't really want to care anymore

08:36 <LuK1337> remove display brightness suport from lights hal

08:36 <LuK1337> and your brightness should be handled via DRM

08:40 <clfbbn> Ok, so "case (int)LightType::BACKLIGHT:" will not do anything but just return "ndk::ScopedAStatus::ok()'

08:40 <LuK1337> don't even claim you support backlight

08:41 <clfbbn> OK

09:02 <clfbbn> Does DRM mean "Direct rendering manager"? When I removed BACKLIGHT support from lights hal, the backlight no longer works. I saw from a youtube video on DRM/KMS that there could be some userspace "libdrm" staff. Is that what I miss?

09:07 <LuK1337> it should be supported by your display hal

09:11 <LuK1337> https://github.com/LineageOS/android_hardware_qcom_display/blob/lineage-19.1-caf-sm8250/composer/QtiComposerClient.cpp#L1035-L1042

09:13 <LuK1337> unless you're using hwc from million years ago

09:13 <LuK1337> for some reason

09:13 <LuK1337> or sony just sucks

09:14 <LuK1337> even my samsung sdm670 does drm brightness now

09:14 <clfbbn> OK... Let me check that out