Comment # 27 on bug 917411 from macias -

> If it happens during media playback,

Never when watching a movie, only (if) listening to some music. So there was no
displaying video involved.

> a suspected culprit is the video driver, of course.  What video driver are you 
> using?

How do I check this?

# lspci
00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev
03)
00:01.0 PCI bridge: Intel Corporation 4 Series Chipset PCI Express Root Port
(rev 03)
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
00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root
Port 1
00:1c.3 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root
Port 4
00:1c.4 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root
Port 5
00:1c.5 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root
Port 6
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 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI
Controller
00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller
01:00.0 VGA compatible controller: NVIDIA Corporation G96 [GeForce 9400 GT]
(rev a1)
02:00.0 Ethernet controller: Qualcomm Atheros AR8121/AR8113/AR8114 Gigabit or
Fast Ethernet (rev b0)
03:00.0 SATA controller: JMicron Technology Corp. JMB361 AHCI/IDE (rev 02)
03:00.1 IDE interface: JMicron Technology Corp. JMB361 AHCI/IDE (rev 02)
04:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6315 Series Firewire
Controller
06:00.0 Ethernet controller: Qualcomm Atheros AR5212/AR5213 Wireless Network
Adapter (rev 01)

> Did you ever test with a newer upstream kernel (3.18 / 3.19)? 

As I wrote, yes, those 2-3 last freezes was on 3.19 in debug mode.

> Also, what about the newer openSUSE-13.2 kernel in OBS Kernel:openSUSE-13.2 
> repo?

What do you mean, there is something even newer than 3.19? I can only see 3.16
there.

http://download.opensuse.org/repositories/Kernel:/openSUSE-13.2/standard/x86_64/

How to turn back dmesg to its default level? I.e. I know how to set it, I don't
what level of messages was the default on installation.