*** This bug is a duplicate of bug 969489 ***
    https://bugs.launchpad.net/bugs/969489

This bug hit me after an upgrade from 14.04 to 16.04.1. Strangely I was
not affected earlier. Maybe a reinstall might fix this issue? Two out of
three reboots lead to failsafe X. Sleep command improved the situation
but still 50%...

Other solutions like restart in rc.local somehow did not work. Maybe
systemd is ignoring it or it is executed way to early. Sleep in
/etc/init/lightdm.conf improved the situation but did not fix it.

$ lspci -nnvv
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Generation Core 
Processor Family Integrated Graphics Controller [8086:041e] (rev 06) (prog-if 
00 [VGA controller])
        DeviceName:  Onboard IGD
        Subsystem: ASUSTeK Computer Inc. 4th Generation Core Processor Family 
Integrated Graphics Controller [1043:8534]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 44
        Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee0100c  Data: 41e1
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915
        Kernel modules: i915

CPU: Intel(R) Core(TM) i3-4160 CPU @ 3.60GHz

Symptoms:
/var/log/Xorg.0.log
[    67.571] (EE) intel(0): [drm] failed to set drm interface version: 
Permission denied [13].
[    67.571] (II) intel(0): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
[    67.571] (II) intel(0): [drm] a dev pid    uid      magic     ioctls
[    67.571] (II) intel(0): [drm] 
[    67.571] (II) intel(0): [drm] y   0  2571     0          0       2004
[    67.571] (II) intel(0): [drm] y   0   179     0          0         20
[    67.571] (II) intel(0): [drm] y   0   179     0          0         19
[    67.571] (II) intel(0): [drm] y   0   179     0          0         19
[    67.571] (II) intel(0): [drm] y   0   179     0          0        116
[    67.571] (EE) intel(0): Failed to claim DRM device.

## xdiagnose process running after start
root      3073  0.0  0.0   7008  1560 ?        S    10:16   0:00 /bin/bash 
/usr/share/xdiagnose/failsafeXinit /etc/X11/xorg.conf.failsafe
##
root      2986  0.0  0.0   7108  1544 ?        Ss   10:16   0:00 /bin/bash 
/usr/share/xdiagnose/failsafeXServer
root      3001  0.0  0.0   3748   656 ?        S    10:16   0:00 xinit 
/usr/share/xdiagnose/failsafeXinit /etc/X11/xorg.conf.failsafe -- /usr/bin/X 
-br -once -config /etc/X11/xorg.conf.failsafe -logfile 
/var/log/Xorg.failsafe.log
root      3002  0.0  0.6 187192 25856 tty2     S<sl+ 10:16   0:00 
/usr/lib/xorg/Xorg :0 -br -once -config /etc/X11/xorg.conf.failsafe -logfile 
/var/log/Xorg.failsafe.log
root      3073  0.0  0.0   7008  1560 ?        S    10:16   0:00 /bin/bash 
/usr/share/xdiagnose/failsafeXinit /etc/X11/xorg.conf.failsafe


gdm3 currently only comes up with a black screen and a mouse cursor and no 
error in the logs...
sddm is working fine but the lockscreen locks the terminal permanently, only 
killing the process on tty1 unlocked it.

Current workaround:

$ cat /etc/systemd/system/lightdmrestart.service
[Unit]
Description=Restart lightdm
After=graphical.target
Wants=lightdm.service accounts-daemon.service

[Service]
Type=oneshot
ExecStart=/usr/local/sbin/restartlightdm.sh

[Install]
WantedBy=default.target


$ cat/usr/local/sbin/restartlightdm.sh
#!/bin/bash

sleep 2
CHECK=$(ps axu | grep "/bin/bash /usr/share/xdiagnose/failsafe[X]init 
/etc/X11/xorg.conf.failsafe")
if [ ! -z "$CHECK" ]; then
  ps axu | grep "/bin/bash /usr/share/xdiagnose/failsafe[X]init 
/etc/X11/xorg.conf.failsafe" | awk '{print $2}' | xargs kill
  sleep 2
  systemctl restart lightdm
else
  exit 0
fi

systemctl enable lightdmrestart
systemctl reboot

Currently working without an issue. Hope it helps if someone else is
still affected and needs a quick fix.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1070150

Title:
  Intermittent black screen or low graphics mode message

Status in Light Display Manager:
  New
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  Update - 01.19.13

  Some systems are intermittently booting to a black screen or message
  about low graphics mode but a graphical login display never loads.

  Multiple GPU's are affected. Intel HD graphics driver and ATI open
  source driver are confirmed to have the issue. Nvidia binary driver
  and Nouveau driver still unconfirmed.

  Multiple users are affected here:
  http://ubuntuforums.org/showthread.php?t=2073483

  There are currently three known workarounds to this issue:
  1) Log in with CTRL+ALT+F1 and issue command "sudo service lightdm restart"
  2) Add some sleep to /etc/init/lightdm.conf
  3) Install and use GDM instead of lightdm

  
  lsb_release -rd
  Description:  Ubuntu 12.10
  Release:      12.10

  uname -a
  Linux matt-pc 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 
x86_64 x86_64 x86_64 GNU/Linux

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-17-generic 3.5.0-17.28
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  matt       2002 F.... pulseaudio
  Date: Mon Oct 22 20:55:29 2012
  HibernationDevice: RESUME=UUID=d9a43e39-0d27-4a5b-90ca-79dc0278afa2
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: System manufacturer System Product Name
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic 
root=UUID=85247ab4-6b7d-4d5a-a265-73b485861e24 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-17-generic N/A
   linux-backports-modules-3.5.0-17-generic  N/A
   linux-firmware                            1.95
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/16/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1606
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z77-V
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1606:bd08/16/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-V:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

To manage notifications about this bug go to:
https://bugs.launchpad.net/lightdm/+bug/1070150/+subscriptions

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