[i915_bpo] System often hangs at the login screen after update to 3.19.0-31.35+bpo1

[Vanessa Chang]

After update to test kernel 3.19.0-31.35+bpo1, the system often hang at the login screen during system booting or reboot.

Test configs:
Intel broadwell UMA graphics
Intel SKL-H graphics
Intel SKL-U graphics

Kernel version: 3.19.0-31.35+bpo1
Failure units: The above mentioned configs
---
ApportVersion: 2.14.1-0ubuntu3.12
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: u 2220 F.... pulseaudio
CurrentDesktop: Unity
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-kittyhawk2-trusty-amd64-20150907-1
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=e81a6713-73c4-4380-a020-308203d60eb2
InstallationDate: Installed on 2015-10-13 (2 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Failed to find casper uuid.conf in 'binary/casper/initrd.img-3.19.0-28-generic.old-dkms' LIVE Binary 20150907-22:18
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.
MachineType: Dell Inc. Latitude E5470
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-31-generic root=UUID=bdf8893c-9b81-46e3-8943-21a4c75fddcd ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.19.0-31.35+bpo1-generic 3.19.8-ckt7
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-31-generic N/A
 linux-backports-modules-3.19.0-31-generic N/A
 linux-firmware 1.127.15
Tags: trusty
Uname: Linux 3.19.0-31-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/03/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 99.3.34
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr99.3.34:bd09/03/2015:svnDellInc.:pnLatitudeE5470:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5470
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1506746

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

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[Vanessa Chang (vanessa-chang)]

As it's a test Kernel testing, I will invalid this issue but leave the bug for a record.

[Timo Aaltonen (tjaalton)]

this is bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1503655

introduced in -31.35, fixed in -31.36. I'll build another test kernel.

[Vanessa Chang (vanessa-chang)]

Verified Passed 10 times of manual reboot test:

Test kernel :
3.19.0-32.37+bpo1

Test Configs:
Intel broadwell UMA graphics
Intel SKL-H graphics
Intel SKL-U graphics