I just updated to 470.57.02 from the OpenSUSE Tumbleweed repo. Prior to the update (and reboot) I was successfully using ddcutil to change the brightness of my two monitors, but now ddcutil detect only reports one of them:
% ddcutil detect Display 1 I2C bus: /dev/i2c-8 EDID synopsis: Mfg id: GSM Model: LG HDR 4K Serial number: Manufacture year: 2019 EDID version: 1.4 VCP version: 2.1
Ddutil used to display two monitors, “DDC-Display” 1 used to be an HP ZR24w (DVI->HDMI cable connected), and DDC-Display 2 was my LG HDR 4K (displayport cable), but now ddutil only reports my LG display as DDC-Display 1. The only change was an update to the nvidia driver and a reboot (twice to check the problem would shake loose). In other respects the two monitors are working normally.
Is this a known issue for 470.57.02?