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[TxSx <ts-p42245@xxxxxxxxxx>]

Another workaround is to add "radeon.modeset=0" after splash  to /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=0"

(Kernel mode setting to user mode setting. What is actually means for
graphics card?)

After setting this there are no more WLAN breaks while watching fullscreen youtube.  
Also sound problems disappear. The above setting reduces CPU load. I see no obvious troubles in video 
performance. What other consequences this setting may have I don't know. I also don't know if this 
works for other Linux distros or for other than Thinkpad T60 users.

I'm not sure what setting was on in Xubuntu 12.10 when I was comparing
to it.

So, IMHO ATI Radeon driver developers should take a look at this
problem.

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https://bugs.launchpad.net/bugs/1277598

Title:
  8086:4227 [Lenovo ThinkPad T60] WLAN connection break under load
  (iwl3945)

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  How to reproduce: Watch a YouTube with Opera full screen, then jump
  back and forth in the video and observe connection break.

  Tried with kernels:
  3.13.1-031301.201401291035
  3.8.0-35.50~precise1
  3.8.0.35.35
  Attachment is from the latest kernel.

  WORKAROUND: Don't watch Flash videos.

  ---
  ApportVersion: 2.13.2-0ubuntu5
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2047 F.... pulseaudio
   /dev/snd/pcmC0D0p:   ubuntu     2047 F...m pulseaudio
  CasperVersion: 1.337
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140224)
  MachineType: LENOVO 2008YZE
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-11-generic N/A
   linux-backports-modules-3.13.0-11-generic  N/A
   linux-firmware                             1.125
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-11-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 09/19/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 79ETD9WW (2.19 )
  dmi.board.name: 2008YZE
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: L3PN735
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr79ETD9WW(2.19):bd09/19/2007:svnLENOVO:pn2008YZE:pvrThinkPadT60:rvnLENOVO:rn2008YZE:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2008YZE
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO

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