blank screen after software update

[giuseppe]

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)

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 12.04 (precise) reached end-of-life on April 28, 2017.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.