[Samsung Galaxy Nexus] julienvt:
here is the twrp recovery log

~ # cat /tmp/recovery.log
Starting TWRP 2.5.0.0 on Sun Jan 2 18:47:30 2000
BOARD_HAS_NO_REAL_SDCARD := true
I:Internal path defined: '/data/media'
I:External path defined: '/usb-otg'
I:Mount: Unable to find partition for path '/data'
SP1_NAME := efs
RECOVERY_SDCARD_ON_DATA := true
TW_NO_USB_STORAGE := true
TW_INCLUDE_CRYPTO := true
Starting the UI...Pixel format: 720x1280 @ 32bpp
Pixel format: BGR_565
framebuffer: fd 3 (720 x 1280)
=> Linking mtab
=> Processing recovery.fstab
I:Processing '/system'
I:Processing '/cache'
I:Recreating /cache/recovery folder.
I:Processing '/data'
I:Can't probe device /dev/block/mmcblk0p12
I:Unable to mount '/data'
I:Actual block device: '/dev/block/mmcblk0p12', current file system: 'ext4'
I:Can't probe device /dev/block/mmcblk0p12
I:Unable to mount '/data'
I:Actual block device: '/dev/block/mmcblk0p12', current file system: 'ext4'
I:Backup folder set to '/data/media/TWRP/BACKUPS/0A3BDBBB0B01F015'
I:Settings storage is '/data/media'
I:Processing '/misc'
I:Processing '/boot'
I:Processing '/recovery'
I:Processing '/sbl'
I:Processing '/xloader'
I:Processing '/radio'
I:Processing '/efs'
I:Created '/efs' folder.
I:Processing '/usb-otg'
I:Created '/usb-otg' folder.
Updating partition details...
I:Can't probe device /dev/block/mmcblk0p10
E:Unable to mount '/system'
I:Actual block device: '/dev/block/mmcblk0p10', current file system: 'ext4'
I:Can't probe device /dev/block/mmcblk0p3
E:Unable to mount '/efs'
I:Actual block device: '/dev/block/mmcblk0p3', current file system: 'ext4'
I:Unable to mount '/usb-otg'
I:Actual block device: '', current file system: 'vfat'
I:Unmounting main partitions...

Partition Logs:
/system | /dev/block/mmcblk0p10 | Size: 0MB Used: 0MB Free: 0MB Backup Size: 0MB
Flags: Can_Be_Mounted Can_Be_Wiped Can_Be_Backed_Up Wipe_Available_in_GUI IsPresent
Primary_Block_Device: /dev/block/mmcblk0p10
Display_Name: System
Storage_Name: System
Backup_Path: /system
Backup_Name: system
Backup_Display_Name: System
Storage_Path: /system
Current_File_System: ext4
Fstab_File_System: ext4
Backup_Method: files

/cache | /dev/block/mmcblk0p11 | Size: 425MB Used: 7MB Free: 418MB Backup Size: 7MB
Flags: Can_Be_Mounted Can_Be_Wiped Can_Be_Backed_Up Wipe_During_Factory_Reset Wipe_Available_in_GUI IsPresent
Primary_Block_Device: /dev/block/mmcblk0p11
Display_Name: Cache
Storage_Name: Cache
Backup_Path: /cache
Backup_Name: cache
Backup_Display_Name: Cache
Storage_Path: /cache
Current_File_System: ext4
Fstab_File_System: ext4
Backup_Method: files

/data | /dev/block/mmcblk0p12 | Size: 13865MB
Flags: Can_Be_Wiped Can_Be_Backed_Up Wipe_During_Factory_Reset Wipe_Available_in_GUI IsPresent Can_Be_Encrypted Is_Encrypted Has_Data_Media Is_Storage Is_Settings_Storage
Symlink_Path: /data/media
Symlink_Mount_Point: /sdcard
Primary_Block_Device: /dev/block/mmcblk0p12
Display_Name: data
Storage_Name: Internal Storage
Backup_Path: /data
Backup_Name: data
Backup_Display_Name: Data
Storage_Path: /data/media
Current_File_System: emmc
Fstab_File_System: ext4
Backup_Method: dd

/misc | /dev/block/mmcblk0p5 | Size: 4MB
Flags: IsPresent
Primary_Block_Device: /dev/block/mmcblk0p5
Display_Name: misc
Storage_Name: misc
Backup_Path: /misc
Backup_Name: misc
Backup_Display_Name: misc
Storage_Path: /misc
Current_File_System: emmc
Fstab_File_System: emmc
Backup_Method: dd

/boot | /dev/block/mmcblk0p7 | Size: 8MB
Flags: Can_Be_Backed_Up IsPresent
Primary_Block_Device: /dev/block/mmcblk0p7
Display_Name: Boot
Storage_Name: boot
Backup_Path: /boot
Backup_Name: boot
Backup_Display_Name: Boot
Storage_Path: /boot
Current_File_System: emmc
Fstab_File_System: emmc
Backup_Method: dd

/recovery | /dev/block/mmcblk0p8 | Size: 11MB
Flags: Can_Be_Backed_Up IsPresent
Primary_Block_Device: /dev/block/mmcblk0p8
Display_Name: Recovery
Storage_Name: recovery
Backup_Path: /recovery
Backup_Name: recovery
Backup_Display_Name: Recovery
Storage_Path: /recovery
Current_File_System: emmc
Fstab_File_System: emmc
Backup_Method: dd

/sbl | /dev/block/mmcblk0p2 | Size: 3MB
Flags: IsPresent
Primary_Block_Device: /dev/block/mmcblk0p2
Display_Name: sbl
Storage_Name: sbl
Backup_Path: /sbl
Backup_Name: sbl
Backup_Display_Name: sbl
Storage_Path: /sbl
Current_File_System: emmc
Fstab_File_System: emmc
Backup_Method: dd

/xloader | /dev/block/mmcblk0p1 | Size: 0MB
Flags: IsPresent
Primary_Block_Device: /dev/block/mmcblk0p1
Display_Name: xloader
Storage_Name: xloader
Backup_Path: /xloader
Backup_Name: xloader
Backup_Display_Name: xloader
Storage_Path: /xloader
Current_File_System: emmc
Fstab_File_System: emmc
Backup_Method: dd

/radio | /dev/block/mmcblk0p9 | Size: 16MB
Flags: IsPresent
Primary_Block_Device: /dev/block/mmcblk0p9
Display_Name: radio
Storage_Name: radio
Backup_Path: /radio
Backup_Name: radio
Backup_Display_Name: radio
Storage_Path: /radio
Current_File_System: emmc
Fstab_File_System: emmc
Backup_Method: dd

/efs | /dev/block/mmcblk0p3 | Size: 0MB Used: 0MB Free: 0MB Backup Size: 0MB
Flags: Can_Be_Mounted Can_Be_Wiped Can_Be_Backed_Up IsPresent
Primary_Block_Device: /dev/block/mmcblk0p3
Display_Name: EFS
Storage_Name: EFS
Backup_Path: /efs
Backup_Name: efs
Backup_Display_Name: EFS
Storage_Path: /efs
Current_File_System: ext4
Fstab_File_System: ext4
Backup_Method: files

/usb-otg | | Size: 0MB Used: 0MB Free: 0MB Backup Size: 0MB
Flags: Can_Be_Mounted Can_Be_Wiped Wipe_Available_in_GUI Removable Is_Storage
Primary_Block_Device: /dev/block/sda1
Alternate_Block_Device: /dev/block/sda
Display_Name: USB-OTG
Storage_Name: USB-OTG
Backup_Path: /usb-otg
Backup_Name: usb-otg
Backup_Display_Name: USB-OTG
Storage_Path: /usb-otg
Current_File_System: vfat
Fstab_File_System: vfat
Backup_Method: files

I:Loading package: TWRP (/res/ui.xml)
I:Loading resources...
I:Loading variables...
I:Loading pages...
I:Loading page main
I:Loading page main2
I:Loading page install
I:Loading page flash_confirm
I:Loading page flash_zip
I:Loading page flash_done
I:Loading page clear_vars
I:Loading page confirm_action
I:Loading page action_page
I:Loading page singleaction_page
I:Loading page action_complete
I:Loading page filecheck
I:Loading page rebootcheck
I:Loading page wipe
I:Loading page advancedwipe
I:Loading page formatdata
I:Loading page formatdata_confirm
I:Loading page backup
I:Loading page backupname1
I:Loading page backupname2
I:Loading page backup_run
I:Loading page restore
I:Unable to open '/data/media/TWRP/BACKUPS/0A3BDBBB0B01F015'
I:Loading page restore_select
I:Loading page renamebackup
I:Loading page restore_run
I:Loading page selectstorage
I:Loading page mount
I:Loading page usb_mount
I:Loading page usb_umount
I:Loading page reboot
I:Loading page settings
I:Loading page timezone
I:Loading page screen
I:Loading page advanced
I:Loading page partsdcard
I:Loading page htcdumlock
I:Loading page lock
I:Loading page filemanagerlist
I:Loading page filemanageroptions
I:Loading page choosedestinationfolder
I:Loading page filemanagerrenamefile
I:Loading page filemanagerrenamefolder
I:Loading page filemanagerchmod
I:Loading page filemanagerconfirm
I:Loading page filemanageracction
I:Loading page decrypt
I:Loading page trydecrypt
I:Loading page terminalfolder
I:Loading page terminalcommand
I:Loading page sideload
I:Loading page installsu
I:Loading page fixsu
I:Switching packages (TWRP)
E:Cannot load volume /misc!
E:Cannot load volume /misc!
Startup Commands: ro.secure=0
ro.allow.mock.location=1
ro.debuggable=1
persist.sys.usb.config=mtp,adb
ro.build.id=IMM76L
ro.build.display.id=cm_maguro-eng 4.0.4 IMM76L eng.dees_troy.20130408.213053 test-keys
ro.build.version.incremental=eng.dees_troy.20130408.213053
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.4
ro.build.date=Mon Apr 8 21:31:04 UTC 2013
ro.build.date.utc=0
ro.build.type=eng
ro.build.user=dees_troy
ro.build.host=ded1.ktechnology.net
ro.build.tags=test-keys
ro.product.model=Galaxy Nexus
ro.product.brand=Google
ro.product.name=yakju
ro.product.device=maguro
ro.product.board=tuna
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Samsung
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=omap4
ro.build.product=maguro
ro.build.description=yakju-user 4.0.4 IMM76I 330937 release-keys
ro.build.fingerprint=google/yakju/maguro:4.0.4/IMM76I/330937:user/release-keys
ro.build.characteristics=nosdcard
ro.cm.device=maguro
rild.libpath=/vendor/lib/libsec-ril.so
rild.libargs=-d /dev/ttys0
telephony.lteOnCdmaDevice=0
ro.telephony.call_ring.multiple=0
ro.rommanager.developerid=cyanogenmod
keyguard.no_require_sim=true
ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html
ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html
ro.com.google.clientidbase=android-google
ro.com.android.wifi-watchlist=GoogleGuest
ro.setupwizard.enterprise_mode=1
ro.com.android.dateformat=MM-dd-yyyy
ro.com.android.dataroaming=false
ro.cm.version=9.0.0-RC0-maguro-UNOFFICIAL
ro.modversion=9.0.0-RC0-maguro-UNOFFICIAL
ro.config.ringtone=CyanTone.ogg
ro.config.notification_sound=CyanMessage.ogg
ro.config.alarm_alert=CyanAlarm.ogg
wifi.interface=wlan0
wifi.supplicant_scan_interval=15
ro.opengles.version=131072
ro.sf.lcd_density=320
dalvik.vm.heapstartsize=8m
dalvik.vm.heapgrowthlimit=64m
dalvik.vm.heapsize=256m
ro.kernel.android.checkjni=1
ro.setupwizard.mode=OPTIONAL
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
net.change=net.bt.name
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.factorytest=0
ro.serialno=0A3BDBBB0B01F015
ro.bootmode=unknown
ro.baseband=I9250XXLA2
ro.carrier=unknown
ro.bootloader=PRIMELA03
ro.hardware=tuna
ro.revision=9
ro.emmc=0
init.svc.recovery=running
service.adb.root=1
init.svc.adbd=running

E:TWFunc::Copy_Log -- Can't open destination log file: '/cache/recovery/log'
I:Copying file /cache/recovery/log to /cache/recovery/last_log
Failed closing /dev/block/mmcblk0p5
(I/O error)
E:Unable to set emmc bootloader message.
I:Is encrypted, do decrypt page first
I:Switching packages (TWRP)
I:Set page: 'decrypt'
I:Cannot find file /nobrightness