X freezes randomly, screen turning black or flickering

Hey everyone,
I'm having this annoying issue where X freezes randomly, I can't tell exactly when it happens. But when it happens, the following occurs:
- Screen is frozen, sometimes turns black, sometimes turns black and reappears, but still frozen.
- Cursor and sound (e.g. music) still works
- When switching to a new tty (CTRL-ALT-F6), I can log in and restart gdm using
sudo systemctl restart gdm
- When I'm in the other tty and trying to switch back to the graphical view, I get stuck completely, not even switching consoles works now.Reset is the only option from there
- Blindly restarting gnome-shell doesn't work
I somehow have the feeling, it happens more often when I physically move my laptop, but thats just a gut feeling. It also happens often when my screen is locked and I try to log back in.
I found this bug report, but its quite old and that doesn't help me: https://bugs.archlinux.org/task/14594
Any help would be very appreciated, its really annoying to lose my work so often.
My specs:
$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea XT GL [FirePro M4000]
Gallium 0.4 on AMD CAPE VERDE
Last edited by freijon (2014-04-12 10:33:22)

I can't tell whether they're relevant, but there are some errors:
journalctl -n 100 wrote:$ journalctl -n 100 | grep ERROR
Apr 14 22:51:11 arch kernel: [drm:si_dpm_set_power_state] *ERROR* si_set_sw_state failed
Apr 14 22:51:22 arch kernel: [drm:r600_ib_test] *ERROR* radeon: fence wait failed (-35).
Apr 14 22:51:22 arch kernel: [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on GFX ring (-35).
Apr 14 22:51:24 arch kernel: [drm:si_dpm_set_power_state] *ERROR* si_set_sw_state failed
Apr 14 22:51:25 arch kernel: [drm:r600_ib_test] *ERROR* radeon: fence wait failed (-35).
Apr 14 22:51:25 arch kernel: [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on GFX ring (-35).
Apr 14 22:51:25 arch kernel: [drm:radeon_pm_resume_dpm] *ERROR* radeon: dpm resume failed
I uploaded the full logs here: https://www.dropbox.com/s/0x3xed11zr13x … ogs.tar.gz in case anyone would like to check it out.

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    com.apple.driver.DspFuncLib    2.2.5a5
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    com.apple.iokit.IOHDAFamily    2.2.5a5
    com.apple.nvidia.nv50hal    7.3.2
    com.apple.NVDAResman    7.3.2
    com.apple.iokit.IONDRVSupport    2.3.4
    com.apple.iokit.IOGraphicsFamily    2.3.4
    com.apple.iokit.IOFireWireIP    2.2.5
    com.apple.driver.IOPlatformPluginLegacy    5.0.0d8
    com.apple.driver.IOPlatformPluginFamily    5.1.1d6
    com.apple.driver.AppleSMC    3.1.3d10
    com.apple.driver.AppleUSBBluetoothHCIController    4.0.8f17
    com.apple.iokit.IOBluetoothFamily    4.0.8f17
    com.apple.iokit.IOSCSIBlockCommandsDevice    3.2.1
    com.apple.iokit.IOUSBMassStorageClass    3.0.3
    com.apple.iokit.IOUSBHIDDriver    5.0.0
    com.apple.driver.AppleUSBMergeNub    5.1.0
    com.apple.driver.AppleUSBComposite    5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.2.1
    com.apple.iokit.IOBDStorageFamily    1.7
    com.apple.iokit.IODVDStorageFamily    1.7.1
    com.apple.iokit.IOCDStorageFamily    1.7.1
    com.apple.iokit.IOSCSIArchitectureModelFamily    3.2.1
    com.apple.iokit.IOFireWireFamily    4.4.8
    com.apple.iokit.IO80211Family    420.3
    com.apple.iokit.IOAHCIFamily    2.0.8
    com.apple.iokit.IONetworkingFamily    2.1
    com.apple.iokit.IOUSBUserClient    5.0.0
    com.apple.iokit.IOUSBFamily    5.1.0
    com.apple.driver.NVSMU    2.2.9
    com.apple.iokit.IOHIDFamily    1.7.1
    com.apple.driver.AppleEFIRuntime    1.6.1
    com.apple.iokit.IOSMBusFamily    1.1
    com.apple.security.sandbox    177.11
    com.apple.kext.AppleMatch    1.0.0d1
    com.apple.driver.DiskImages    331.7
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    com.apple.driver.AppleKeyStore    28.18
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    com.apple.iokit.IOPCIFamily    2.7
    com.apple.iokit.IOACPIFamily    1.4
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    ModelName "Monitor Model"
    EndSection
    Section "Device"
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    #Option "SWcursor" # [<bool>]
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    #Option "CacheLines" # <i>
    #Option "Dac6Bit" # [<bool>]
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    #Option "NoDDC" # [<bool>]
    #Option "ShowCache" # [<bool>]
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    Option "NoDDC" "True"
    Option "XAANoOffscreenPixmaps" "True"
    Option "EnablePageFlip" "True"
    Option "RenderAccel" "True"
    Identifier "Card0"
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    VendorName "Intel Corporation"
    BoardName "Mobile 945GME Express Integrated Graphics Controller"
    BusID "PCI:0:2:0"
    EndSection
    Section "Screen"
    Identifier "Screen0"
    Device "Card0"
    Monitor "Monitor0"
    DefaultDepth 24
    SubSection "Display"
    Viewport 0 0
    Depth 1
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 4
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 8
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 15
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 16
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 24
    Modes "1024x600
    EndSubSection
    EndSection
    Section "Extensions"
    Option "Composite" "Enable"
    EndSection
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