I have three screens:
1) nVidia GTX 970M HDMI port of laptop. 1920x1080 2) USB-C, Thunderbolt III HDMI dongle. 3840x2160 3) Laptop eDP1 (i7 6700HQ, HD 530 iGPU). 1920x1080
Upon resume the 3840x2160 screen's wallpaper is **OK**.
The two 1920x1080 screens wallpaper is all white.
Ubuntu 16.04.6 LTS upgrade direct to 19.04 w/kernel 5.0.0-23 yesterday.
I have three screens:
1) nVidia GTX 970M HDMI port of laptop. 1920x1080
2) USB-C, Thunderbolt III HDMI dongle. 3840x2160
3) Laptop eDP1 (i7 6700HQ, HD 530 iGPU). 1920x1080
Upon resume the 3840x2160 screen's wallpaper is **OK**.
The two 1920x1080 screens wallpaper is all white.
Ubuntu 16.04.6 LTS upgrade direct to 19.04 w/kernel 5.0.0-23 yesterday.