Public bug reported: I ran "sudo apt-get upgrade" and after rebooting I started to have problems with the display. Now it's black even from the boot options screen (I mean before GRUB menu). I left the system go up end after connecting via ssh I could see the following in dmesg:
[ 796.633789] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 797.133525] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(8). [ 797.133531] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 797.633326] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(9). [ 797.633331] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 798.133117] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(10). [ 798.133122] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 798.632897] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(11). [ 798.632903] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 799.132682] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(12). [ 799.132687] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 799.632462] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(13). [ 799.632467] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 800.132257] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(14). [ 800.132263] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 800.632060] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(15). [ 800.632065] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 801.131826] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(0). [ 801.131832] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 801.631619] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(1). [ 801.631624] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 802.131420] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(2). [ 802.131426] [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB ! [ 802.631209] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(3). $ uname -a Linux ajax 3.2.0-124-generic #167-Ubuntu SMP Fri Mar 3 15:25:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux Any suggestion? Thanks in advance, Giuseppe ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+12ubuntu2 ProcVersionSignature: Ubuntu 3.2.0-124.167-generic 3.2.79 Uname: Linux 3.2.0-124-generic x86_64 ApportVersion: 2.0.1-0ubuntu17.15 Architecture: amd64 Date: Tue Mar 21 15:25:55 2017 InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423) MarkForUpload: True SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug precise -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1674704 Title: blank screen after software update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1674704/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp