Linux Mint 14 - Cinnamon 1.6.7 crashes

[AK23]

Today I installed Mint 14.1 64 bit on my main desktop pc, only to find that cinnamon always crashes after some time, leaving me without a panel and without window borders... pretty much the desktop environment is dead, however I can still type into windows and even move some around. Some information about my system:

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andreas@powerplant:~$ inxi -Fxz
System:    Host: powerplant Kernel: 3.5.0-17-generic x86_64 (64 bit, gcc: 4.7.2) Desktop: Gnome Distro: Linux Mint 14 Nadia
Machine:   Mobo: ASRock model: Z68 Pro3-M Bios: American Megatrends version: P1.00 date: 04/27/2011
CPU:       Quad core Intel Core i5-2500K CPU (-MCP-) cache: 6144 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 26339.4 
           Clock Speeds: 1: 1600.00 MHz 2: 1600.00 MHz 3: 1600.00 MHz 4: 1600.00 MHz
Graphics:  Card: Intel 2nd Generation Core Processor Family Integrated Graphics Controller bus-ID: 00:02.0 
           X.Org: 1.13.0 driver: intel Resolution: 1680x1050@60.0hz 
           GLX Renderer: Mesa DRI Intel Sandybridge Desktop GLX Version: 3.0 Mesa 9.0 Direct Rendering: Yes
Audio:     Card: Intel 6 Series/C200 Series Chipset Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
           Sound: Advanced Linux Sound Architecture ver: 1.0.25
Network:   Card: Realtek RTL8111/8168B PCI Express Gigabit Ethernet controller 
           driver: r8169 ver: 2.3LK-NAPI port: e000 bus-ID: 05:00.0
           IF: eth0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:    HDD Total Size: 1060.2GB (35.6% used) 1: id: /dev/sda model: CSSD size: 60.0GB 
           2: id: /dev/sdb model: WDC_WD5000AAJS size: 500.1GB 3: id: /dev/sdc model: WDC_WD5000BEVT size: 500.1GB 
Partition: ID: / size: 47G used: 4.0G (9%) fs: ext4 ID: /home size: 459G used: 348G (80%) fs: ext4 
           ID: swap-1 size: 9.00GB used: 0.00GB (0%) fs: swap 
RAID:      No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors:   System Temperatures: cpu: 30.0C mobo: N/A 
           Fan Speeds (in rpm): cpu: N/A 
Info:      Processes: 165 Uptime: 39 min Memory: 856.6/7711.6MB Runlevel: 2 Gcc sys: 4.7.2 Client: Shell inxi: 1.8.4 

When cinnamon is crashed and I try to restart it, I get this:

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andreas@powerplant:~$ cinnamon
      JS LOG: About to start Cinnamon
Fensterverwalter-Warnung:Log level 16: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject
Fensterverwalter-Warnung:Log level 16: Error registering polkit authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject (polkit-error-quark 0)
      JS LOG: Cinnamon started at Sat Dec 01 2012 19:58:14 GMT+0100 (CET)
      JS LOG: network applet: Cannot find connection for active (or connection cannot be read)
intel_do_flush_locked failed: Eingabe-/Ausgabefehler

I should also mention that I still experienced the bug where the wrong graphics driver is chosen and xorg burns 300% cpu, so I created an xorg.conf with

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Section "Device"
        Identifier "My device"
        Driver "intel"
EndSection

like it was suggested by clem on the launchpad bugtracker. The cinnamon error appeared before I did this however.

Has anyone else noticed this behaviour? Any clues what is going wrong here?

Regards, Andreas

[AK23]

So in case anyone has the same problem, it appears that the solution was to add this line

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GRUB_CMDLINE_LINUX_DEFAULT="i915.i915_enable_rc6=0 quiet splash"

to the GRUB menu for Linux Mint 14, as described in this thread:

http://forums.linuxmint.com/viewtopic.php?f=59&t=113043

At least since I did this yesterday I didn't experience any more crashes of cinnamon.