Hi,
I am building B2G on a 64-bit freshly installed Kubuntu 12.10 on a Ivy-Bridge 
system with 16 GB Ram.

The compilation runs fine, but when I launch ./run-emulator the emulator starts 
but something seems to hang and I get black screen.

I tried many suggestions I found googling around but none has resolved the 
issue so I suspect it might be a new one.

I also tried to switch to mozilla-aurora b2g but nothing has changed.

I noticed the following error during starting:
E/GeckoConsole(   43): [JavaScript Error: "this.webapps[msg.id] is undefined" 
{file: "resource://gre/modules/Webapps.jsm" line: 636}]

and clicking on certain spots(invisible UI parts?) on the black screen triggers 
this error in the log:
E/GeckoConsole(   43): [JavaScript Error: "NS_ERROR_XPC_BAD_CONVERT_JS: Could 
not convert JavaScript argument arg 0 [nsIDOMWindow.getComputedStyle]" {file: 
"chrome://global/content/BrowserElementChild.js" line: 905}]

Can anyone help me?
Thank you in advance,
Riccardo

Full emulator and logcat output:
B2GBUILD/B2G$ ./run-emulator.sh
emulator: autoconfig: -system ./out/target/product/generic//system.img
emulator: autoconfig: -ramdisk ./out/target/product/generic//ramdisk.img
emulator: autoconfig: -datadir ./out/target/product/generic/
emulator: Found target ABI=armeabi-v7a, architecture=arm
emulator: Found target API level: 15
emulator: using core hw config path: 
./out/target/product/generic//hardware-qemu.ini
emulator: keyset loaded from: /home/droidcoder/.android/default.keyset
emulator: trying to load skin file 
'./development/tools/emulator/skins/HVGA/layout'
emulator: skin network speed: 'full'
emulator: skin network delay: 'none'
emulator: Using initial system image: ./out/target/product/generic//system.img
emulator: autoconfig: -initdata ./out/target/product/generic//userdata.img
emulator: autoconfig: -sdcard ./out/target/product/generic//system.img
emulator: Physical RAM size: 512MB

emulator: Auto-config: -qemu -cpu cortex-a8
Content of hardware configuration file:
  hw.cpu.arch = arm
  hw.cpu.model = cortex-a8
  hw.ramSize = 512
  hw.screen = touch
  hw.mainKeys = yes
  hw.trackBall = yes
  hw.keyboard = no
  hw.keyboard.lid = no
  hw.keyboard.charmap = qwerty2
  hw.dPad = yes
  hw.gsmModem = yes
  hw.gps = yes
  hw.battery = yes
  hw.accelerometer = yes
  hw.audioInput = yes
  hw.audioOutput = yes
  hw.sdCard = yes
  hw.sdCard.path = ./out/target/product/generic//system.img
  disk.cachePartition = yes
  disk.cachePartition.size = 66m
  hw.lcd.width = 320
  hw.lcd.height = 480
  hw.lcd.depth = 16
  hw.lcd.density = 160
  hw.lcd.backlight = yes
  hw.gpu.enabled = yes
  hw.camera.back = emulated
  hw.camera.front = none
  vm.heapSize = 48
  hw.sensors.proximity = yes
  hw.sensors.magnetic_field = yes
  hw.sensors.orientation = yes
  hw.sensors.temperature = yes
  kernel.path = ./prebuilts/qemu-kernel/arm/kernel-qemu-armv7
  kernel.parameters =  android.checkjni=1
  disk.ramdisk.path = ./out/target/product/generic//ramdisk.img
  disk.systemPartition.initPath = ./out/target/product/generic//system.img
  disk.systemPartition.size = 512m
  disk.dataPartition.path = 
./out/target/product/generic//./out/target/product/generic/userdata.img
  disk.dataPartition.size = 512m
  avd.name = <build>
.
QEMU options list:
emulator: argv[00] = "./out/host/linux-x86/bin/emulator64-arm"
emulator: argv[01] = "-cpu"
emulator: argv[02] = "cortex-a8"
emulator: argv[03] = "-android-hw"
emulator: argv[04] = "./out/target/product/generic//hardware-qemu.ini"
Concatenated QEMU options:
 ./out/host/linux-x86/bin/emulator64-arm -cpu cortex-a8 -android-hw 
./out/target/product/generic//hardware-qemu.ini
emulator: registered 'boot-properties' qemud service
emulator: nand_add_dev: 
system,size=0x20000000,initfile=./out/target/product/generic//system.img
emulator: mapping 'system' NAND image to /tmp/android-droidcoder/emulator-yM90p0
emulator: rounding devsize up to a full eraseunit, now 20004000

WARNING: Data partition already in use. Changes will not persist!
emulator: nand_add_dev: userdata,size=0x20000000
emulator: mapping 'userdata' NAND image to 
/tmp/android-droidcoder/emulator-4UphxS
emulator: rounding devsize up to a full eraseunit, now 20004000

emulator: registered 'boot-properties' qemud service
emulator: Adding boot property: 'dalvik.vm.heapsize' = '48m'
emulator: Adding boot property: 'qemu.sf.lcd_density' = '160'
emulator: Adding boot property: 'qemu.hw.mainkeys' = '1'
emulator: Adding boot property: 'qemu.sf.fake_camera' = 'back'
emulator: nand_add_dev: cache,size=0x4200000
emulator: mapping 'cache' NAND image to /tmp/android-droidcoder/emulator-vs1BEK
emulator: Initializing hardware OpenGLES emulation support
emulator: Kernel parameters: qemu.gles=1 qemu=1 console=ttyS0 
android.qemud=ttyS1 android.checkjni=1 ndns=1
emulator: Trace file name is not set

emulator: autoconfig: -scale 1
emulator: Found ro.adb.qemud build property: 1
emulator: control console listening on port 5554, ADB on port 5555
emulator: sent '0012host:emulator:5555' to ADB server
emulator: ping program: /home/developer/B2G/out/host/linux-x86/bin/ddms
emulator: ping command: /home/developer/B2G/out/host/linux-x86/bin/ddms ping 
emulator 20.0 "Intel Open Source Technology Center" "Mesa DRI Intel(R) 
Ivybridge Desktop " "3.0 Mesa 9.0"
goldfish_fb_get_pixel_format:167: display surface,pixel format:
  bits/pixel:  16
  bytes/pixel: 2
  depth:       16
  red:         bits=5 mask=0xf800 shift=11 max=0x1f
  green:       bits=6 mask=0x7e0 shift=5 max=0x3f
  blue:        bits=5 mask=0x1f shift=0 max=0x1f
  alpha:       bits=0 mask=0x0 shift=0 max=0x0


B2G/out/host/linux-x86/bin$ ./adb logcat
I/qemu-props(   33): connected to 'boot-properties' qemud service.
I/qemu-props(   33): receiving..
I/qemu-props(   33): received: dalvik.vm.heapsize=48m
I/DEBUG   (   35): debuggerd: Nov  2 2012 00:24:18
I/Vold    (   32): Vold 2.1 (the revenge) firing up
D/Vold    (   32): Volume sdcard state changing -1 (Initializing) -> 0 
(No-Media)
I/qemu-props(   33): receiving..
I/qemu-props(   33): received: qemu.sf.lcd_density=160
I/qemu-props(   33): receiving..
I/qemu-props(   33): received: qemu.hw.mainkeys=1
I/qemu-props(   33): receiving..
I/qemu-props(   33): received: qemu.sf.fake_camera=back
I/qemu-props(   33): receiving..
I/qemu-props(   33): exiting (4 properties set).
I/Netd    (   34): Netd 1.0 starting
D/Vold    (   32): Volume sdcard state changing 0 (No-Media) -> 1 
(Idle-Unmounted)
E/Netd    (   34): Unable to bind netlink socket: No such file or directory
E/Netd    (   34): Unable to open quota2 logging socket
I/        (   37): ServiceManager: 0x18910
I/        (   38): ServiceManager: 0xf958
I/AudioFlinger(   38): Loaded primary audio interface from LEGACY Audio HW HAL 
(audio)
I/AudioFlinger(   38): Using 'LEGACY Audio HW HAL' (audio.primary) as the 
primary audio interface
D/AudioHardwareInterface(   38): setMode(NORMAL)
I/CameraService(   38): CameraService started (pid=38)
D/EmulatedCamera_QemuClient(   38): Emulated camera list: 
D/EmulatedCamera_FakeCamera(   38): Initialize: Fake camera is facing back
V/EmulatedCamera_Factory(   38): 1 cameras are being emulated. Fake camera ID 
is 0
I/AudioFlinger(   38): AudioFlinger's thread 0x10fa8 ready to run
W/AudioFlinger(   38): Thread AudioOut_1 cannot connect to the power manager 
service
I/AudioPolicyService(   38): Loaded audio policy from LEGACY Audio Policy HAL 
(audio_policy)
E/profiler(   43): Registering start signal
D/        (   43): HostConnection::get() New Host Connection established 
0x430f07d0, tid 43
I/Gonk    (   43): Socket open for RIL
I/VolumeManager(   43): changing state from 'Uninitialized' to 'Starting'
I/VolumeManager(   43): Connected to vold
D/VoldCmdListener(   32): volume list
I/VolumeManager(   43): Volume sdcard: changing state from Init to Idle (1 
observers)
I/VolumeManager(   43): changing state from 'Starting' to 'Volumes Ready'
E/AutoMounter(   43): Unable to open file 
'/sys/devices/virtual/usb_composite/usb_mass_storage/enable' for reading
E/AutoMounter(   43): Unable to open file 
'/sys/devices/virtual/switch/usb_configuration/state' for reading
I/AutoMounter(   43): UpdateState: umsAvail:0 umsEnabled:0 mode:0 
usbCablePluggedIn:0 tryToShare:0
I/AutoMounter(   43): UpdateState: Volume sdcard is Idle and inserted
D/VoldCmdListener(   32): volume mount sdcard
I/Vold    (   32): /dev/block/vold/179:0 being considered for volume sdcard
D/Vold    (   32): Volume sdcard state changing 1 (Idle-Unmounted) -> 3 
(Checking)
W/Vold    (   32): Skipping fs checks
I/VolumeManager(   43): Volume sdcard: changing state from Idle to Checking (3 
observers)
E/Vold    (   32): /dev/block/vold/179:0 failed to mount via VFAT (Invalid 
argument)
E/Vold    (   32): Volume sdcard found no suitable devices for mounting :(
D/Vold    (   32): Volume sdcard state changing 3 (Checking) -> 1 
(Idle-Unmounted)
I/VolumeManager(   43): Volume sdcard: changing state from Checking to Idle (3 
observers)
W/Vold    (   32): Returning OperationFailed - no handler for errno 22
E/AutoMounter(   43): Command 'volume mount sdcard' failed: 400 'volume 
operation failed (Invalid argument)'
E/AutoMounter(   43): Unable to open file 
'/sys/devices/virtual/usb_composite/usb_mass_storage/enable' for reading
E/AutoMounter(   43): Unable to open file 
'/sys/devices/virtual/switch/usb_configuration/state' for reading
I/AutoMounter(   43): UpdateState: umsAvail:0 umsEnabled:0 mode:0 
usbCablePluggedIn:0 tryToShare:0
I/AutoMounter(   43): UpdateState: Volume sdcard is Idle and inserted
D/VoldCmdListener(   32): volume mount sdcard
I/Vold    (   32): /dev/block/vold/179:0 being considered for volume sdcard
D/Vold    (   32): Volume sdcard state changing 1 (Idle-Unmounted) -> 3 
(Checking)
I/VolumeManager(   43): Volume sdcard: changing state from Idle to Checking (3 
observers)
W/Vold    (   32): Skipping fs checks
E/Vold    (   32): /dev/block/vold/179:0 failed to mount via VFAT (Invalid 
argument)
E/Vold    (   32): Volume sdcard found no suitable devices for mounting :(
D/Vold    (   32): Volume sdcard state changing 3 (Checking) -> 1 
(Idle-Unmounted)
I/VolumeManager(   43): Volume sdcard: changing state from Checking to Idle (3 
observers)
W/Vold    (   32): Returning OperationFailed - no handler for errno 22
E/AutoMounter(   43): Command 'volume mount sdcard' failed: 400 'volume 
operation failed (Invalid argument)'
E/AutoMounter(   43): Unable to open file 
'/sys/devices/virtual/usb_composite/usb_mass_storage/enable' for reading
E/AutoMounter(   43): Unable to open file 
'/sys/devices/virtual/switch/usb_configuration/state' for reading
I/AutoMounter(   43): UpdateState: umsAvail:0 umsEnabled:0 mode:0 
usbCablePluggedIn:0 tryToShare:0
I/AutoMounter(   43): UpdateState: Volume sdcard is Idle and inserted
D/VoldCmdListener(   32): volume mount sdcard
I/Vold    (   32): /dev/block/vold/179:0 being considered for volume sdcard
D/Vold    (   32): Volume sdcard state changing 1 (Idle-Unmounted) -> 3 
(Checking)
I/VolumeManager(   43): Volume sdcard: changing state from Idle to Checking (3 
observers)
W/Vold    (   32): Skipping fs checks
E/Vold    (   32): /dev/block/vold/179:0 failed to mount via VFAT (Invalid 
argument)
E/Vold    (   32): Volume sdcard found no suitable devices for mounting :(
D/Vold    (   32): Volume sdcard state changing 3 (Checking) -> 1 
(Idle-Unmounted)
I/VolumeManager(   43): Volume sdcard: changing state from Checking to Idle (3 
observers)
W/Vold    (   32): Returning OperationFailed - no handler for errno 22
E/AutoMounter(   43): Command 'volume mount sdcard' failed: 400 'volume 
operation failed (Invalid argument)'
I/Gonk    (   43): Unable to open file 
/sys/class/android_usb/android0/f_rndis/ethaddr.
I/Gonk    (   43): fail to give rndis interface an address
I/Gonk    (   43): Connected to netd
I/EventHub(   43): New device: id=1, fd=81, path='/dev/input/event0', 
name='qwerty2', classes=0x2d, configuration='/system/usr/idc/qwerty2.idc', 
keyLayout='/system/usr/keylayout/qwerty.kl', 
keyCharacterMap='/system/usr/keychars/qwerty2.kcm', builtinKeyboard=true
E/EventHub(   43): could not get driver version for /dev/input/mouse0, Not a 
typewriter
E/EventHub(   43): could not get driver version for /dev/input/mice, Not a 
typewriter
I/InputReader(   43): Device reconfigured: id=0, name='qwerty2', surface size 
is now 320x480, mode is 1
I/InputReader(   43): Device added: id=0, name='qwerty2', sources=0x00011307
E/GeckoConsole(   43): [JavaScript Warning: "Unknown property 
'-moz-align-self'.  Declaration dropped." {file: 
"resource://gre-resources/ua.css" line: 44}]
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Idle
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Checking
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Idle
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Checking
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Idle
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Checking
I/nsVolumeService(   43): UpdateVolume: 'sdcard' state Idle
I/FMRadio (   43): FMRadio is initialized.
I/GeckoDump(   43): Opened socket on 9999
I/Gecko   (   43): RIL Worker: DateTimeZone string 
12/11/02:10:13:36+4:0:posix!Europe!Vatican
W/AudioFlinger(   38): Thread AudioOut_1 cannot connect to the power manager 
service
I/Gecko   (   43): [AccessFu] INFO attach
D/NetUtils(   43): failed to remove default route for tiwlan0: No such device
E/GeckoConsole(   43): [JavaScript Error: "this.webapps[msg.id] is undefined" 
{file: "resource://gre/modules/Webapps.jsm" line: 636}]
E/profiler(  141): Registering start signal
E/GeckoConsole(  141): [JavaScript Warning: "Unknown property 
'-moz-align-self'.  Declaration dropped." {file: 
"resource://gre-resources/ua.css" line: 44}]
E/GeckoConsole(   43): [JavaScript Warning: "Unknown property 
'-moz-align-self'.  Declaration dropped." {file: 
"resource://gre-resources/ua.css" line: 44}]
E/WifiHW  (   43): Cannot open "/system/etc/wifi/wpa_supplicant.conf": No such 
file or directory
E/WifiHW  (   43): Wi-Fi will not be enabled
I/IdleService(   43): DailyCallback started
I/IdleService(   43): DailyCallback running
I/IdleService(   43): DailyCallback registering Idle observer
I/IdleService(   43): Register idle observer 425603c0 for 300 seconds
I/IdleService(   43): Register: adjusting next switch from -1 to 300 seconds
I/IdleService(   43): next timeout 1351851526952903 usec (299995 msec from now)
I/IdleService(   43): SetTimerExpiryIfBefore: next timeout 1351851526952903 usec
I/IdleService(   43): reset timer expiry from 0 usec to 1351851526962903 usec
E/GeckoConsole(   43): [JavaScript Error: "NS_ERROR_XPC_BAD_CONVERT_JS: Could 
not convert JavaScript argument arg 0 [nsIDOMWindow.getComputedStyle]" {file: 
"chrome://global/content/BrowserElementChild.js" line: 905}]


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