This is an issue with the driver message log filling with warnings, and NOT an actual issue with the hardware or software functionality. Sound on this system works as expected, but dmesg becomes cluttered with log information that does not appear of significant value, considering the frequency and repetition of the warnings.
The following message appears, repeated on multiple consecutive lines: "sound hdaudioC0D0: HDMI ATI/AMD: no speaker allocation for ELD" and on some occasions is accompanied by an entry stating: "[drm:dce4_afmt_write_speaker_allocation] *ERROR* Couldn't read Speaker Allocation Data Block: 0"
The system in question is a laptop with an external monitor connected over HDMI. It has been freshly built with Lubuntu 14.10 Beta 2, and the same issue also occurs when using testing the mainline kernel 3.17.0-031700rc7.201409281835.
The occasions on which this issue (the repeated warnings) occurs under strict testing conditions include:
* Using the Monitor Preferences (LXRandR) to turn OFF and ON the external monitor (approx 10 warnings for each action)
* Putting the system into the suspend power mode and subsequently resuming (approx 30 warnings)
No warnings occur when:
* unplugging or plugging the HDMI cable
* locking and unlocking the lightdm desktop
I have observed occasions where the warnings are written many, many hundreds of times, on an almost continuous basis, but I have not been able to reproduce this behavior in controlled circumstances.
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-20-generic 3.16.0-20.27
ProcVersionSignature: Ubuntu 3.16.0-20.27-generic 3.16.3
Uname: Linux 3.16.0-20-generic x86_64
ApportVersion: 2.14.7-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: art 2113 F.... pulseaudio
/dev/snd/controlC0: art 2113 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory: 'iw'
CurrentDesktop: LXDE
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Fri Oct 3 19:20:02 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-09-26 (7 days ago)
InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
MachineType: Acer AO722
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-20-generic root=UUID=bf9f8de0-2b70-4f49-85ee-54f7d94a6508 ro
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
dmi.bios.date: 09/25/2012
dmi.bios.vendor: Acer
dmi.bios.version: V1.11
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: JE10-BZ
dmi.board.vendor: Acer
dmi.board.version: Base Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.11
dmi.modalias: dmi:bvnAcer:bvrV1.11:bd09/25/2012:svnAcer:pnAO722:pvrV1.11:rvnAcer:rnJE10-BZ:rvrBaseBoardVersion:cvnAcer:ct10:cvrV1.11:
dmi.product.name: AO722
dmi.product.version: V1.11
dmi.sys.vendor: Acer
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