Garbled sound when YouTube fullscreen mode

[FelineZoo]

Hello,

I have been running Linux Mint for 1.5 yrs so a bit of a newbie. Sound has been fine until recently but not sure what has happened. The audio is fine when I'm watching a Youtube video, but when I switch to full screen mode it becomes garbled. This also occur when playing music files (FLAC, mp3) in Clementine 1.2.3. Audio sounds fine but when I drag music from file list to playlist, or even just move the mouse around the audio becomes garbled. I have searched all over the internet and this forum and tried various things but nothing seems to work. I have tried to alter setting in pulseaudio (various suggestions here and other forums) or run ALSA mode in Clementine, but still the same result.

It seems that the audio becomes garbles when the CPU or video card are taxed. Is that possible and if so how can I determine if that is the case. I have include info on distro and computer. Thanks for your assistance.



System: Host: ThinkPad60 Kernel: 3.13.0-37-generic i686 (32 bit, gcc: 4.8.2) Desktop: N/A Distro: Linux Mint 17.1 Rebecca
Machine: System: LENOVO (portable) product: 87445BU version: ThinkPad T60
Mobo: LENOVO model: 87445BU Bios: LENOVO version: 7IET30WW (1.11 ) date: 07/13/2007
CPU: Dual core Intel Core2 CPU T7200 (-MCP-) cache: 4096 KB flags: (lm nx sse sse2 sse3 ssse3 vmx) bmips: 7977.2
Clock Speeds: 1: 2000.00 MHz 2: 1000.00 MHz
Graphics: Card: Advanced Micro Devices [AMD/ATI] RV515/M54 [Mobility Radeon X1400] bus-ID: 01:00.0
X.org: 1.15.1 drivers: ati,radeon (unloaded: fbdev,vesa) tty size: 156x39 Advanced Data: N/A for root
Audio: Card: Intel NM10/ICH7 Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture ver: k3.13.0-37-generic
Network: Card-1: Qualcomm Atheros AR5418 Wireless Network Adapter [AR5008E 802.11(a)bgn] (PCI-Express)
driver: ath9k bus-ID: 03:00.0
IF: wlan0 state: up mac: <filter>
Card-2: Intel 82573L Gigabit Ethernet Controller driver: e1000e ver: 2.3.2-k port: 3000 bus-ID: 02:00.0
IF: eth0 state: down mac: <filter>
Drives: HDD Total Size: 1000.2GB (22.1% used) 1: id: /dev/sda model: ST1000LM014 size: 1000.2GB
Partition: ID: / size: 914G used: 206G (24%) fs: ext4 ID: swap-1 size: 3.22GB used: 0.00GB (0%) fs: swap
RAID: No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors: System Temperatures: cpu: 44.0C mobo: 35.0C
Fan Speeds (in rpm): cpu: 3057
Info: Processes: 168 Uptime: 45 min Memory: 893.0/3028.7MB Runlevel: 2 Gcc sys: 4.8.4 Client: Shell inxi: 1.8.4