Ubuntu launchpad bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1020041 Lenovo Ideapad s205 AMD64 E-450 No sound on HDMI screen, not even if plugged in at boot. No able to select it in sound settings. Tested with Kernel v3.5-rc6-quantal, bug still present. It works on older kernels. Attached files from ubuntu apport-collect. ApportVersion: 2.3-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: mads 1836 F.... pulseaudio /dev/snd/controlC0: mads 1836 F.... pulseaudio CurrentDmesg: [ 38.488008] init: plymouth-stop pre-start process (1328) terminated with status 1 DistroRelease: Ubuntu 12.10 HibernationDevice: RESUME=UUID=3f8eb1eb-e922-4eec-aa30-39ccd17fe056 InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120709.1) MachineType: LENOVO 1038D4G Package: linux (not installed) ProcEnviron: LANGUAGE=en_US:en TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-4-generic root=UUID=d6a193cf-f328-477a-b050-a99989a018f8 ro quiet splash ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6 RelatedPackageVersions: linux-restricted-modules-3.5.0-4-generic N/A linux-backports-modules-3.5.0-4-generic N/A linux-firmware 1.83 StagingDrivers: rts5139 Tags: quantal running-unity staging Uname: Linux 3.5.0-4-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 08/10/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 4BCN24WW dmi.board.asset.tag: Base Board Asset Tag Unknown dmi.board.name: Inagua dmi.board.vendor: LENOVO dmi.board.version: 109-B78210-00A dmi.chassis.asset.tag: Chassis Asset Tag Unknown dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Chassis Version Unknown dmi.modalias: dmi:bvnLENOVO:bvr4BCN24WW:bd08/10/2011:svnLENOVO:pn1038D4G:pvrIdeapadS205:rvnLENOVO:rnInagua:rvr109-B78210-00A:cvnLENOVO:ct10:cvrChassisVersionUnknown: dmi.product.name: 1038D4G dmi.product.version: Ideapad S205 dmi.sys.vendor: LENOVO
Created attachment 76501 [details] Apport-collect files
Did you pass audio=1 option to radeon driver? Otherwise HDMI/DP audio is disabled as default. And which older kernel did it work exactly?
In Ubuntu 11.10 it worked without problems, in 12.04 the screen needs to be connected at bootup, and in 12.10 it does not work at all. (all version numbers with default kernels). Regarding "audio=1" i have not done anything but to test Quantal Alpha on my laptop, and my skill are insufficient to test this without guiding. -Please advice. thanks you.
Better to ask on Ubuntu's forum, then...
As part of testing for Ubuntu QA team i have reported a bug on this, on launchpad: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1020041 See comment #24 If it is futile or i am to unskilled please tell me and i will reported it back.
Usually passing "radeon.audio=1" at boot option should work. But this isn't guaranteed to work always, depending on distro and its version, so I suggested to ask Ubuntu how to do it. More than that I cannot help at this moment.
Ok, thank you. I will do.
Also, it's not clear what you exactly tested. Such a problem is often not only in the kernel but in other levels. Did you test the problem with an older kernel on the new system? I mean just replacing the kernel with old one but keeping others as is. This is the standard test for a kernel regression. The bug description doesn't tell what application is used with which sound backend. Or, imagine how you can reproduce the problem on other machines with other distribution. See? The bug must be reproduced in a more low-level way, e.g. just using ALSA-native apps like aplay without PulseAudio. So, please try to strip down the way to reproduce the bug on a minimal system not being Ubuntu-specific. Then it'll make easier to understand the cause of the problem.
Thank you for your advice. My laptop are in for repair (mouse button), but as soon as i get it back i will get on with testing.