Created attachment 116540 [details]
Output of dmesg (see detail in description)
'xset dpms force off' turns the screen blank but the LCD backlight remains on.
Linux kernel 4.0.5 running on a MacbookPro 11,3.
dmesg.txt attached from running kernel with 'nouveau.debug=VBIOS=trace,I2C=debug,DISP=debug,DRM=debug drm.debug=0xe' and should contain output generated from running xset dpms force off at the end of file.
Created attachment 116541 [details]
Workaround: using the nv driver