CID 201403-14889
with updated 14.04.2 (3.16.0-34-generic #45~14.04.1)
Steps to reproduce this bug:
scenario A:
connected external HDMI --> settings --> display --> try different display mode --> built-in screen will be black but alt+b+prntScr works. (external monitor still works)
scenario B:
system power on --> try to boot desktop --> could not boot to desktop , built-in screen will be black but alt+b+prntScr works.
failure rate: 1 out 3
---------------------------------------------
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-34-generic 3.16.0-34.45~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-34.45~14.04.1-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Apr 10 13:56:51 2015
InstallationDate: Installed on 2015-04-09 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 1654 F.... pulseaudio
CRDA:
country TW:
(2402 - 2472 @ 40), (3, 27)
(5270 - 5330 @ 40), (3, 17), DFS
(5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=442dffc7-a562-4b0d-a6d6-cb69d6891c61
InstallationDate: Installed on 2015-04-09 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Dell Inc. Inspiron 11 - 3147
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic.efi.signed root=UUID=da9b59f7-7780-41c5-9e5f-03acb414b69e ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.16.0-34.45~14.04.1-generic 3.16.7-ckt8
RelatedPackageVersions:
linux-restricted-modules-3.16.0-34-generic N/A
linux-backports-modules-3.16.0-34-generic N/A
linux-firmware 1.127.11
Tags: trusty
Uname: Linux 3.16.0-34-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/22/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X30
dmi.board.name: 00K010
dmi.board.vendor: Dell Inc.
dmi.board.version: D02
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: X30
dmi.modalias: dmi:bvnDellInc.:bvrX30:bd08/22/2014:svnDellInc.:pnInspiron11-3147:pvr:rvnDellInc.:rn00K010:rvrD02:cvnDellInc.:ct8:cvrX30:
dmi.product.name: Inspiron 11 - 3147
dmi.sys.vendor: Dell Inc.
Please refer to the screenshot when the system connected to an external HDMI monitor.
It shows two displays but at the same time the built-in monitor is black.