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 Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1692437 Title: Monitors on second GPU not working after upgrade to zesty Status in Light Display Manager: Invalid Status in xserver-xorg-driver-radeonhd: Invalid Status in lightdm package in Ubuntu: Invalid Status in switcheroo-control package in Ubuntu: New Bug description: I'm not 100% sure this is the right package to file the bug against, but since upgrading to zesty the two monitors on my second GPU are no longer detected once I reach the greeter screen at login time. However, both of them display information during boot. Let me know how I can narrow down the bug report. ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: lightdm 1.22.0-0ubuntu2.1 ProcVersionSignature: Ubuntu 4.8.0-52.55-generic 4.8.17 Uname: Linux 4.8.0-52-generic x86_64 ApportVersion: 2.20.4-0ubuntu4 Architecture: amd64 CurrentDesktop: GNOME Date: Mon May 22 01:42:58 2017 EcryptfsInUse: Yes InstallationDate: Installed on 2016-04-29 (388 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: lightdm UpgradeStatus: Upgraded to zesty on 2017-05-22 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1692437/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
