Good news: I have a had a small eureka moment that results my computer fully booted with graphics hardware fully accelerated. Bad news: it is still a workaround -- I still can't push power button and boot up normally.
Here is the workaround sequence -- it requires another computer that can ssh in: 1. Computer in OFF state, press power. 2. At boot select screen, press `e` and edit kernel line by appending `modprobe.blacklist=radeon` 3. Press `F10` to boot 4. At login screen, click gear icon in upper right and select `Suspend` 5. After computer is in suspended state, press any key to awaken. 6. The display does not "reawaken" and still appears off. 7. From another computer, ssh into the first. 8. Issue `sudo service lightdm stop` 9. Issue `sudo modprobe radeon`. This should succeed! \o/ 10. Issue `sudo service lightdm start` Now the computer should be using correct drm drivers and have full resolution display. Furthermore, Suspend and Wake work successfully. I discovered this using ubuntu mainline kernel 4.8.0-rc5 but have verified it works with mainline 4.8.6 and also with 4.4.0-45. Unfortunately, I am also using the oibaf/graphics-drivers PPA with more recent mesa and libdrm drivers. I plan to test again after removing the PPA but it may take a while. If anyone with this problem is still watching, I'd be curious to hear if my workaround steps work for you. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1568429 Title: 1002:68b8 Radeon won't work with KMS enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1568429/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
