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Behavior:

Ever since I first installed 15.04 back in April/May on my new DELL
Inspiron 3646:

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: Dell Inc.
        Product Name: Inspiron 3646

I have experienced frequent(daily/every-other-day)complete
lockups(cannot even switch to console(Alt-F1,F2,etc.).


I have determined that the issue is related to the 'i915' driver in relation to my GPU:

00:02.0 VGA compatible controller: Intel Corporation Atom Processor
Z36xxx/Z37xxx Series Graphics & Display (rev 0e)


on SoC:

Handle 0x0004, DMI type 4, 42 bytes
Processor Information
        Socket Designation: CPU 1
        Type: Central Processor
        Family: Atom
        Manufacturer: Intel(R) Corporation
        ID: 78 06 03 00 FF FB EB BF
        Signature: Type 0, Family 6, Model 55, Stepping 8
        Flags:
                FPU (Floating-point unit on-chip)
                VME (Virtual mode extension)
                DE (Debugging extension)
                PSE (Page size extension)
                TSC (Time stamp counter)
                MSR (Model specific registers)
                PAE (Physical address extension)
                MCE (Machine check exception)
                CX8 (CMPXCHG8 instruction supported)
                APIC (On-chip APIC hardware supported)
                SEP (Fast system call)
                MTRR (Memory type range registers)
                PGE (Page global enable)
                MCA (Machine check architecture)
                CMOV (Conditional move instruction supported)
                PAT (Page attribute table)
                PSE-36 (36-bit page size extension)
                CLFSH (CLFLUSH instruction supported)
                DS (Debug store)
                ACPI (ACPI supported)
                MMX (MMX technology supported)
                FXSR (FXSAVE and FXSTOR instructions supported)
                SSE (Streaming SIMD extensions)
                SSE2 (Streaming SIMD extensions 2)
                SS (Self-snoop)
                HTT (Multi-threading)
                TM (Thermal monitor supported)
                PBE (Pending break enabled)
        Version: Intel(R) Pentium(R) CPU  J2900  @ 2.41GHz
        Voltage: 0.9 V
        External Clock: 83 MHz
        Max Speed: 2656 MHz
        Current Speed: 2425 MHz
        Status: Populated, Enabled
        Upgrade: None
        L1 Cache Handle: 0x0007
        L2 Cache Handle: 0x0008
        L3 Cache Handle: Not Provided
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified
        Core Count: 4
        Core Enabled: 4
        Thread Count: 4
        Characteristics:
                64-bit capable
                Multi-Core
                Execute Protection
                Enhanced Virtualization
                Power/Performance Control


I have gained _significant_ improvements in reliability / stability by
using various flags / parameters in the i915 module:

/etc/modprobe.d/i915.conf:

options i915 semaphores=1


and / or


/etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_pstate=disable"


and / or


/usr/share/X11/xorg.conf.d/20-intel.conf:

Section "Device"
   Identifier "Intel Graphics"
   Driver "intel"
   Option "TearFree" "1"
EndSection


and / or


Disable "Intel Virtualization Technologies" in the BIOS.



chris@CKR-DKM:~$ lsb_release -rd
Description:    Ubuntu 15.04
Release:        15.04

chris@CKR-DKM:~$ apt-cache policy xorg
xorg:
  Installed: (none)
  Candidate: 1:7.7+7ubuntu4
  Version table:
     1:7.7+7ubuntu4 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages

I'm currently using:  intel-linux-graphics-
installer_1.2.0-0intel1_amd64.deb

from:  https://01.org/linuxgraphics

with similar results(maybe a little better than the stock i915 stack in
15.04).

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xorg (not installed)
ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
CompositorRunning: None
Date: Wed Oct  7 09:32:47 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0e) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:068d]
InstallationDate: Installed on 2015-09-17 (19 days ago)
InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 (20150422)
LightdmGreeterLog:
 ** (lightdm-gtk-greeter:1005): WARNING **: [PIDs] Failed to execute command: upstart
 
 ** (lightdm-gtk-greeter:1005): WARNING **: Failed to load user image: Failed to open file '/home/chris/.face': No such file or directory
MachineType: Dell Inc. Inspiron 3646
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic.efi.signed root=UUID=ef22be35-6f79-4356-be42-2689d1de0378 ro quiet
SourcePackage: xorg
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/17/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0V6D8J
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A09
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd08/17/2015:svnDellInc.:pnInspiron3646:pvr:rvnDellInc.:rn0V6D8J:rvrA00:cvnDellInc.:ct3:cvrA09:
dmi.product.name: Inspiron 3646
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
xserver.bootTime: Tue Oct  6 20:05:51 2015
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                 990 
 vendor                                     ACR
xserver.version: 2:1.17.1-0ubuntu3.1

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug latest-bios-a09 ubuntu vivid
-- 
15.04 freezes totally using Intel(i915) on BayTrail / ValleyView SoC(J2900 CPU)
https://bugs.launchpad.net/bugs/1503731
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