[Dell Latitude E7240] mini-displayport audio only works via cold-plug or resume from suspend

[Taihsiang Ho]

Dell Latitude E7240 (CID 201304-13407) on ubuntu 12.04.5

Steps to reproduce this bug:
1. plug in the mini display port to an external monitor with speaks.
2. click the sound indicator on the unity desktop to choose the correct audio source and test the audio

Expected result:
there should be displayport audio source ready for you to select.

Actual result:
No such audio source

More information:
1. the audio source could pop up if you cold boot or suspend-resume.
2. HDMI audio of this system could work as hot plug.

--------------

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57~precise1 [modified: boot/vmlinuz-3.13.0-32-generic]
ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-32-generic.
ApportVersion: 2.0.1-0ubuntu17.7
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 1: PCH [HDA Intel PCH], device 0: ALC292 Analog [ALC292 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: ubuntu 1726 F.... pulseaudio
 /dev/snd/controlC0: ubuntu 1726 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'HDMI'/'HDA Intel HDMI at 0xf7e34000 irq 64'
   Mixer name : 'Intel Haswell HDMI'
   Components : 'HDA:80862807,80860101,00100000'
   Controls : 21
   Simple ctrls : 3
Card1.Amixer.info:
 Card hw:1 'PCH'/'HDA Intel PCH at 0xf7e30000 irq 65'
   Mixer name : 'Realtek ALC292'
   Components : 'HDA:10ec0292,102805ca,00100001'
   Controls : 28
   Simple ctrls : 13
Date: Wed Sep 10 05:43:00 2014
HibernationDevice: RESUME=UUID=12a1f163-a692-48a5-ad30-3bb81ec765d7
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
MachineType: Dell Inc. Latitude E7240
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=357c487a-9f05-4648-995c-b870064d383c ro quiet splash initcall_debug vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-32-generic N/A
 linux-backports-modules-3.13.0-32-generic N/A
 linux-firmware 1.79.16
SourcePackage: linux-lts-trusty
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/05/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0G05MN
dmi.board.vendor: Dell Inc.
dmi.board.version: X01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd10/05/2013:svnDellInc.:pnLatitudeE7240:pvr01:rvnDellInc.:rn0G05MN:rvrX01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7240
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

[penalvch (penalvch)]

Taihsiang Ho, thank you for reporting this and helping make Ubuntu better.

As per http://www.dell.com/support/home/us/en/19/product-support/product/latitude-e7240-ultrabook/drivers/advanced an update to your computer's buggy and outdated BIOS is available (A17). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?

Once the BIOS is updated, if the problem is still reproducible:
1) Please provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2) Please make a comment specifically advising on if there was an improvement or not.
3) Please mark this report Status Confirmed. If it's not reproducible, please mark this as Invalid.

Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]