Hi Sean, first please CC me because I am not subscribed to the list. > I can't reproduce this problem on a similar configuration of debian > testing amd64, so I'm going to wager a guess that this may be > hardware-specific. We may need to know more information about Mira's > hardware. Sorry again for not precise description of problem. Problem appears when gnome3 auto_sleep_system , I have suspend turned off (I called it suspend but not really sure if this is suspend). I tried reproduce this problem here with suspend (which I normally not use) , but I can't. Maybe thread should be renamed. Here is my lspci output on my desktop: 00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 02) 00:01.0 PCI bridge: Intel Corporation 4 Series Chipset PCI Express Root Port (rev 02) 00:19.0 Ethernet controller: Intel Corporation 82567LF-2 Gigabit Network Connection 00:1a.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4 00:1a.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5 00:1a.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6 00:1a.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2 00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller 00:1d.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1 00:1d.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2 00:1d.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3 00:1d.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90) 00:1f.0 ISA bridge: Intel Corporation 82801JIR (ICH10R) LPC Interface Controller 00:1f.2 IDE interface: Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1 00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller 00:1f.5 IDE interface: Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cedar PRO [Radeon HD 5450] 01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cedar HDMI Audio [Radeon HD 5400/6300 Series] 02:02.0 USB controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 62) 02:02.1 USB controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 62) 02:02.2 USB controller: VIA Technologies, Inc. USB 2.0 (rev 65) 02:03.0 RAID bus controller: Silicon Image, Inc. PCI0680 Ultra ATA-133 Host Controller (rev 02) > Lastly: one thing I always suggest to those who have problems with > PulseAudio is, try killing PA and playing audio through a plain ALSA > application. Try something like `aplay` or `gst-launch-0.10` with alsa > hw:0 device or similar, to avoid going through PA. If you can > reproduce the defect with pure ALSA without pulseaudio involved, > 99.9999% chance it's not a PA bug, but an alsa-lib or alsa-kernel bug. I tried many times when this occurs to start jackd and play sound through it. It worked always. Because jackd connecting itself to ALSA it led me to think about pulseaudio problem. I will test it your way too immediately it appears again. > That should be reported upstream IMHO, esp. if you're using the latest > stable kernel or newer. I am running 3.2.0-2-rt-amd64 but tried also not_real_time kernel and issue appeared. regards mira