Chiming in, seeming to have the same or similar issues. Had a couple of kernel panics in a row yesterday, stack trace on reboot seemed to have graphics-like modules in it. Also (and perhaps more impactful to me) is that virtually 80% of my wake-by-opening-clamshell results in a black screen, yet it's clearly backlit (the apple logo on the other side of the screen is glowing). I have to hold down the power button for 5 seconds to force-kill the machine. Every day!
Hopefully this is enough to go on here - I'll open an apple radar if necessary, but I'm also trying out the gfxCard menu thing, and keeping it on the discrete GPU to see if that affects things.
panic(cpu 6 caller 0xffffff80052b7b95): Kernel trap at 0xffffff7f86358e0b, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0x0000000000000000, CR3: 0x00000001d1a92095, CR4: 0x00000000001606e0
RAX: 0x0000000000000000, RBX: 0x0000000000000000, RCX: 0xffffff800585cba0, RDX: 0xffffff802e586c08
RSP: 0xffffff81519eb810, RBP: 0xffffff81519eb830, RSI: 0x0000000000000003, RDI: 0x0000000000000004
R8: 0x00000000000013ea, R9: 0x0000000000000000, R10: 0x0000000000000000, R11: 0x00000000baae0005
R12: 0xffffff80d8a3abe0, R13: 0xffffff802e81c000, R14: 0xffffff802d9c8400, R15: 0x000000000000001a
RFL: 0x0000000000010286, RIP: 0xffffff7f86358e0b, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000000, Error code: 0x0000000000000000, Fault CPU: 0x6
Backtrace (CPU 6), Frame : Return Address
0xffffff81519eb4b0 : 0xffffff800521d5f6
0xffffff81519eb520 : 0xffffff80052b7b95
0xffffff81519eb6f0 : 0xffffff80052ce4ad
0xffffff81519eb710 : 0xffffff7f86358e0b
0xffffff81519eb830 : 0xffffff7f86a2c680
0xffffff81519ebc60 : 0xffffff7f869c8efa
0xffffff81519ebc90 : 0xffffff7f869ccf9f
0xffffff81519ebcb0 : 0xffffff7f8635b2a4
0xffffff81519ebcd0 : 0xffffff7f8635b237
0xffffff81519ebd00 : 0xffffff7f869e48cc
0xffffff81519ebd30 : 0xffffff7f869c95d2
0xffffff81519ebd80 : 0xffffff7f869e304f
0xffffff81519ebdb0 : 0xffffff7f86a23e25
0xffffff81519ebde0 : 0xffffff7f869e57b2
0xffffff81519ebe00 : 0xffffff7f86a07b4f
0xffffff81519ebe20 : 0xffffff7f869e57f9
0xffffff81519ebe40 : 0xffffff8005662ef5
0xffffff81519ebe60 : 0xffffff8005294456
0xffffff81519ebe80 : 0xffffff8005220abd
0xffffff81519ebeb0 : 0xffffff8005210448
0xffffff81519ebf00 : 0xffffff80052195fb
0xffffff81519ebf70 : 0xffffff80052a5ad6
0xffffff81519ebfb0 : 0xffffff80052ced13
Kernel Extensions in backtrace:
com.apple.GeForce(8.0)[91C40470-82BA-329A-A9D7-4C70F28275FD]@0xffffff7f869c3000 ->0xffffff7f86a85fff
dependency: com.apple.NVDAResman(8.0.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f859 1d000
dependency: com.apple.iokit.IONDRVSupport(2.3.4)[E37F420A-B5CD-38ED-9441-5247583B6ACE]@0xff ffff7f85909000
dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f85892000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[5D671681-D21B-3CCA-9810-B15E648C1B27]@0 xffffff7f858c6000
com.apple.iokit.IOSurface(86.0.2)[7199A934-B665-33C1-A15A-F56A811A1C2B]@0xfffff f7f86357000->0xffffff7f86368fff
BSD process name corresponding to current thread: PluginProcess