Hi everyone, I'm running Ubuntu 16.04.2 on a 27" unibody iMac 10,1 from 2009. However, even with the most recent HWE stack (kernel 4.8), the display stays black after suspend. I can ssh into the machine, so wakeup is OK, but the display is entirely black (backlight stays off). Note: this appears to be entirely unrelated to the TDM stuff I posted about earlier. Interestingly, when I enable TDM, even after suspend, the display works while TDM is active. Once I disable TDM, it's back to black (unintentional song reference there). I've noted that in /sys/class/backlight, there are two different control interfaces, apple_backlight and radeon_bl0. Before suspend, I can control the screen brightness from system settings, even if only one of them is loaded, so both brightness interfaces work. What I've already tried without success: - Blindly switching to the console and back. - Calling DISPLAY=:0.0 xrandr --output eDP1 --auto via ssh. - Restarting X via ssh. - Blacklist apple_bl on the kernel cmdline (modprobe.blacklist=apple_bl). - Disabling the radeon backlight on the kernel cmdline (radeon.backlight=0). - Using radeontool to turn the backlight back on after suspend. - Directly using the interface in /sys/class/backlight/ to turn it back on. I'm starting to run out of ideas... any hints? Regards, Florian -- SENT FROM MY DEC VT50 TERMINAL
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