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Hello,
I have some kind of "any distribution" bugs here it is :
With every kernel more recent than 3.12 (I haven't still found the exact commit, but the first ubuntu released kernel in which it happens is the 3.13rc1), it seems that the kernel is loaded with radeon.audio=1 by default, and the ATI 4550 (and probably others) can't boot (black screen with frozen system) or only with nomodeset.

This error is repoductible with any ubuntu version or flavor, and even
with other distros.

So to boot any kernel more recent than 3.12 I have to use radeon.audio=0
as an argument to boot.

But the second problem is that now, audio over HDMI is disabled, but I
have found somewhere a command that make audio over HDMI back : "xrandr
--output HDMI-0 --set audio on".

I'm free to answer any question and to help to debug it as much I'm
skilled enough to do it.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
Uname: Linux 3.13.11-03131102-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Wed May 21 11:46:10 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] RV710 [Radeon HD 4350/4550] [1002:954f] (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited / Sapphire Technology Device [174b:e164]
InstallationDate: Installed on 2014-05-19 (1 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 004: ID 0d8c:0201 C-Media Electronics, Inc. CM6501
 Bus 002 Device 003: ID 046d:c51b Logitech, Inc. V220 Cordless Optical Mouse for Notebooks
 Bus 002 Device 002: ID 045e:0752 Microsoft Corp. Wired Keyboard 400
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: System manufacturer System Product Name
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.11-03131102-generic root=UUID=e6dbe289-d08f-46a5-8b48-a183d6e38d92 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/25/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS M2N-E SLI ACPI BIOS Revision 0801
dmi.board.name: M2N-E SLI
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: 1.XX
dmi.chassis.asset.tag: 123456789000
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSM2N-ESLIACPIBIOSRevision0801:bd04/25/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N-ESLI:rvr1.XX:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Wed May 21 11:38:15 2014
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        Microsoft Wired Keyboard 400 KEYBOARD, id 8
 input        Logitech USB Receiver MOUSE, id 9
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2
xserver.video_driver: radeon

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 4550 amd apport-bug ati radeon.audio trusty ubuntu
-- 
Radeon 4550 can't boot without radeon.audio=0 since kernel 3.13
https://bugs.launchpad.net/bugs/1321889
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