After going on the #radeon channel on Freenode, we narrowed the problem down to the switcheroo-control package. We started by hand making an xorg.conf file and disabling gpu-manager, but still had issues. Looking at the dmesg log, we saw that the discrete gpu is enabled at first, then disabled sometime in the systemd start up. After trying to disable various things, including switcheroo, from the kernel parameters and having the problem still occur, we narrowed it down to being a service that was writing to `/sys/kernel/debug/vgaswitcheroo/switch`. I looked at my enabled services, and saw `switcheroo-control`, after disabling, everything started working again.
Given that the package was integrated into gnome in late 2016 [0][1], it lines up timewise with when I started having problems. [0] https://askubuntu.com/questions/1034882/gnome-does-not-show-the-option-to-use-dedicated-graphics-card-on-right-click [1] http://www.hadess.net/2016/10/dual-gpu-integration-in-gnome.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1692437 Title: Monitors on second GPU not working after upgrade to zesty To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1692437/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
