The mac does not start and stop on a white screen after the apple. Occasionally this white screen is replaced by a black screen or a blue screen with lines also when I try to launch it in safe mkde. When the mac starts normally, before the appearance of the login screen you can see a strong image noise that it reappears when it is put under stress the GPU. Sometimes the computer freezes completely even under conditions of normal use despite having been installed gfxCardStatus and with whom is daily except the discrete card.
Welcome to the club.
Now that I have the problem again and now how to manage it a bit better I can actually dig a bit into it.
You might want to try:
gzcat /var/log/system.log.*.gz | grep -C12 "GPU hang"
This will check your saved old logs for all occurences of nasty error messages usually related to this problem. This will only reach one week back but better than nothing.
You might want to note down the first occurence of:
Feb 23 01:12:36 xena kernel[0]: GPU Hang State = 0x00000000
Feb 23 01:12:36 xena kernel[0]: GPU hang:
Feb 23 01:12:36 xena kernel[0]: Trying restart GPU ...
And this:
Feb 23 09:46:20 xena kernel[0]: GPU Hang State = 0x00000000
Feb 23 09:46:20 xena kernel[0]: GPU hang:
Feb 23 09:46:20 xena kernel[0]: Trying restart GPU ...
Feb 23 09:46:20 xena kernel[0]: AMDTurksGraphicsAccelerator: bad busy count (255,1)
Feb 23 09:46:20 xena kernel[0]: Backtrace 0xffffff800068dec2 0xffffff800068dcb6 0xffffff7f82176a63 0xffffff7f821564a5 0xffffff7f8215da57 0xffffff7f8216230d 0xffffff7f821b86f4
Feb 23 09:46:20 xena kernel[0]: Kernel Extensions in backtrace:
Feb 23 09:46:20 xena kernel[0]: com.apple.iokit.IOAcceleratorFamily(98.7.1)[024BF8EC-2925-3C4B-ADBB-CFE36F7D41C 5]@0xffffff7fa514e000->0xffffff7fa51a6fff
Feb 23 09:46:20 xena kernel[0]: dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7fa38ce000
Feb 23 09:46:20 xena kernel[0]: dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7fa41b4000
Feb 23 09:46:20 xena kernel[0]: com.apple.AMDRadeonX3000(1.1.4)[4333F950-8969-31AB-93E2-DF7D2DE76A9F]@0xffffff7 fa51b3000->0xffffff7fa5553fff
Feb 23 09:46:20 xena kernel[0]: dependency: com.apple.iokit.IOAcceleratorFamily(98.7.1)[024BF8EC-2925-3C4B-ADBB-CFE36F7D41C 5]@0xffffff7fa514e000
Feb 23 09:46:20 xena kernel[0]: dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7fa38ce000
Feb 23 09:46:20 xena kernel[0]: dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7fa41b4000
Funny enough, this way I found out today that Apple actually tries to keep track of GPU restarts, there's a directory called "/private/var/db/GPURestartReporter" -- I wonder what that is for if there's no problem with GPUs...