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[Rusty Shackleford <Shackleford071250@xxxxxxxxx>]

I was hesitant to install the daily build again since I felt I was being
run around in circles. An acquaintance has pointed out that doing it
would server a useful purpose.

So I have completed that task. Once again I was unable to reproduce the
issue with a live-usb containing the daily build. There were occasions
when I thought the screen was going to go black - but then it did
recover. And once again I did try a live-usb with 14.04.1 and was also
not able to reproduce the issue: making me once again consider that it
might be a configuration issue.

So I looked at the parameters being used by the i915 driver.

These parameters were in common between the my system and the 14.04.1
live-usb that works so well:

/sys/module/i915/parameters/disable_power_well:1
/sys/module/i915/parameters/fastboot:N
/sys/module/i915/parameters/invert_brightness:0
/sys/module/i915/parameters/lvds_channel_mode:0
/sys/module/i915/parameters/lvds_downclock:0
/sys/module/i915/parameters/lvds_use_ssc:-1
/sys/module/i915/parameters/modeset:-1
/sys/module/i915/parameters/panel_ignore_lid:1
/sys/module/i915/parameters/powersave:1
/sys/module/i915/parameters/prefault_disable:N
/sys/module/i915/parameters/preliminary_hw_support:1
/sys/module/i915/parameters/reset:Y
/sys/module/i915/parameters/semaphores:-1
/sys/module/i915/parameters/vbt_sdvo_panel_type:-1
/sys/module/i915/parameters/enable_ips:1
/sys/module/i915/parameters/enable_psr:0
/sys/module/i915/parameters/enable_hangcheck:Y

These parameters seem to have been renamed:

/sys/module/i915/parameters/enable_rc6:1
/sys/module/i915/parameters/enable_fbc:-1
/sys/module/i915/parameters/enable_ppgtt:1

/* Power Saving features? */
/sys/module/i915/parameters/enable_pc8:1    		
/sys/module/i915/parameters/pc8_timeout:5000

/* Defunct LVDS setting? *?
/sys/module/i915/parameters/fbpercrtc:0

/* New parameters? */
/sys/module/i915/parameters/disable_display:N
/sys/module/i915/parameters/disable_vtd_wa:N
/sys/module/i915/parameters/enable_cmd_parser:1

I tried to change some of these at bootup to see if they affected the
behaviour: they didn't.

It seems possibly tied to power saving: on the 14.04.1 live-usb
buffering seemed to work better on user switching so perhaps the system
never though it was entering a power saving mode and thus never turned
off the screen.

Next week I will install the HWE Stack for 14.04.3 that has the Vivid
kernel/drivers to see if that fixes things.

My acquaintance is a retired software engineer - application level stuff
on Windows and Macs. But has played with Linux a bit and even though he
has never dug into drivers or kernel code he has said he would be
willing to help me out (already showed me how to build the kernel). So
I'll up my level interest in debugging.

What next steps do you suggest?


 

** Changed in: xorg (Ubuntu)
       Status: Incomplete => New

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1437719

Title:
  [Dell Inspiron 5547] Black Screen on user switch

Status in xorg package in Ubuntu:
  New

Bug description:
  When switching users (primarly using Ctrl-Alt-F(7-10) the monitor will
  sometimes go black. This happens once or twice a day, although on
  occasion it doesn't occur for several days. It has occurred at least
  once a week since I installed Ubuntu 14.04.1. It seems to be more of a
  problem since moving to 14.04.2 - I did perform installation of the
  Utopic Kernel, X, and MesaGL packages, but this is only perception. At
  the same time I switched from Unity to Cinnamon (Jeremy Clarkson isn't
  the only dinosaur roaming the world) - but I have confirmed that just
  running Unity desktops is vunerable.

  The display can be restored by sudo service lightdm restart - run from
  an ssh login from another system.

  Steps to consistently reproduce the problem is simply to perform
  abusive user stress testing: switching from one user to another
  rapidly: as soon as the display switches go back to the other. Usually
  I can get a black screen with this method in under a minute with Unity
  desktops.

  I have the same issue with another system (Dell Vostro 3550) reported
  in Bug #1437557 - submitting a new defect since this is different
  hardware and even though the defects look the same there might be
  differences underneath the hood causing the problem.

  
  14.04.2 Trusty
  3.16.0-33-generic.
  I'll edit this report shortly with additional system info.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
  Uname: Linux 3.16.0-33-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.8
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Sat Mar 28 14:45:26 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:063e]
  InstallationDate: Installed on 2014-12-23 (95 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 5547
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-33-generic root=UUID=6eb0eadb-81ed-43ee-aab3-e3fe6b37ca75 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/12/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0598GM
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A05
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/12/2014:svnDellInc.:pnInspiron5547:pvrA05:rvnDellInc.:rn0598GM:rvrA00:cvnDellInc.:ct8:cvrA05:
  dmi.product.name: Inspiron 5547
  dmi.product.version: A05
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150122-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1~ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Fri Mar 27 15:14:18 2015
  xserver.configfile: default
  xserver.errors:
   SynPS/2 Synaptics TouchPad: Read error 19
   SynPS/2 Synaptics TouchPad: Read error 19
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1110 
   vendor                                     LGD
  xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

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