12.04 - Minecraft crashes and logs out of Unity

Background: This recently started happening only after I installed some updates or possibly after I installed jDownloader.

What happens? I run Minecraft and can get to the login page, but after logging in and seeing the Mojang logo my screen goes black and sends me back to the login screen.

Output of dmesg:

Code:

[139320.407817] [fglrx] IRQ 44 Disabled [139320.881792] fglrx_pci 0000:01:00.0: irq 44 for MSI/MSI-X [139320.883514] [fglrx] Firegl kernel thread PID: 30509 [139320.883716] [fglrx] Firegl kernel thread PID: 30510 [139320.883927] [fglrx] Firegl kernel thread PID: 30511 [139320.884209] [fglrx] IRQ 44 Enabled [139321.072416] [fglrx] Gart USWC size:1280 M. [139321.072419] [fglrx] Gart cacheable size:508 M. [139321.072422] [fglrx] Reserved FB block: Shared offset:0, size:1000000 [139321.072424] [fglrx] Reserved FB block: Unshared offset:fbfd000, size:403000 [139321.072425] [fglrx] Reserved FB block: Unshared offset:3fff4000, size:c000

And output of the crash report:

Code:

# # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007f917dcded90, pid=30426, tid=140263097546496 # # JRE version: 6.0_24-b24 # Java VM: OpenJDK 64-Bit Server VM (20.0-b12 mixed mode linux-amd64 compressed oops) # Derivative: IcedTea6 1.11.5 # Distribution: Ubuntu 12.04 LTS, package 6b24-1.11.5-0ubuntu1~12.04.1 # Problematic frame: # C [libxcb-glx.so.0+0xfd90] xcb_glx_gen_queries_arb_data_length+0x0 # # If you would like to submit a bug report, please include # instructions how to reproduce the bug and visit: # https://bugs.launchpad.net/ubuntu/+source/openjdk-6/ # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # --------------- T H R E A D --------------- Current thread (0x00007f9120036000): JavaThread "Minecraft main thread" daemon [_thread_in_native, id=30461, stack(0x00007f918c0ab000,0x00007f918c1ac000)] siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x0000000000000004 Registers: RAX=0x0000000000000000, RBX=0x0000000000000000, RCX=0x0000000000000000, RDX=0x00007f9118018808 RSP=0x00007f918c1aa438, RBP=0x00007f91184aa000, RSI=0x0000000000000000, RDI=0x0000000000000000 R8 =0x00007f9118018830, R9 =0x0000000000000000, R10=0x00007f918c1aa1d0, R11=0x00007f917dcded90 R12=0x00007f911803f6c0, R13=0x0000000000009080, R14=0x00007f918c1aa520, R15=0x00007f9120036000 RIP=0x00007f917dcded90, EFLAGS=0x0000000000010202, CSGSFS=0x0000000000000033, ERR=0x0000000000000004 TRAPNO=0x000000000000000e Top of Stack: (sp=0x00007f918c1aa438) 0x00007f918c1aa438: 00007f917e33d03f 00000006fc750270 0x00007f918c1aa448: 00000006fc750270 00007f918c1aa4e0 0x00007f918c1aa458: 0000000000000000 00000006fc750270 0x00007f918c1aa468: 00007f919d010d68 00007f916411bfa0 0x00007f918c1aa478: 00007f916411bfa0 00000006fffffffe 0x00007f918c1aa488: 0000000000000000 00000006fc4bb880 0x00007f918c1aa498: 0000000000000000 00007f918c1aa4a0 0x00007f918c1aa4a8: 00000006fc750270 00007f918c1aa520 0x00007f918c1aa4b8: 00000006fc7518e0 0000000000000000 0x00007f918c1aa4c8: 00000006fc750270 0000000000000000 0x00007f918c1aa4d8: 00007f918c1aa500 00007f918c1aa568 0x00007f918c1aa4e8: 00007f919d00585a 00000006fc751878 0x00007f918c1aa4f8: 00007f919d00df58 00007f917e0f49e0 0x00007f918c1aa508: 00007f918c1aa568 00007f91184aa000 0x00007f918c1aa518: 00000007aed90e08 0000000000009080 0x00007f918c1aa528: 00007f918c1aa528 00000006fc75017a 0x00007f918c1aa538: 00007f918c1aa590 00000006fc7518e0 0x00007f918c1aa548: 0000000000000000 00000006fc7501b0 0x00007f918c1aa558: 00007f918c1aa500 00007f918c1aa590 0x00007f918c1aa568: 00007f918c1aa5d8 00007f919d00585a 0x00007f918c1aa578: 00007f917e0f49e0 0000000000000000 0x00007f918c1aa588: 00000007ad7d8228 00000007aed90e08 0x00007f918c1aa598: 00007f918c1aa598 00000006fc72f015 0x00007f918c1aa5a8: 00007f918c1aa638 00000006fc74b250 0x00007f918c1aa5b8: 0000000000000000 00000006fc72f210 0x00007f918c1aa5c8: 00007f918c1aa590 00007f918c1aa628 0x00007f918c1aa5d8: 00007f918c1aa690 00007f919d00585a 0x00007f918c1aa5e8: 0000000000000000 0000000000000000 0x00007f918c1aa5f8: 0000000000000000 0000000000000000 0x00007f918c1aa608: 0000000000000000 0000000000000000 0x00007f918c1aa618: 0000000000000020 0000000000000022 0x00007f918c1aa628: 00000007ad970b60 00000007b04c0d48 Instructions: (pc=0x00007f917dcded90) 0x00007f917dcded70: 0c a1 ff ff 48 83 c4 58 c3 0f 1f 80 00 00 00 00 0x00007f917dcded80: 48 8d 47 20

Let me know if I can provide any more information.

AMD Phenom II X6 1055T
SAPPHIRE Radeon HD 6870 1GB 256-bit GDDR5
GIGABYTE GA-990XA-UD3 AM3+ AMD 990X

edit: I may have accidentally updated the kernel and it's also possible that my graphics drivers were built manually. I'm going to try uninstalling reinstalling/updating.

edit #2: uninstalling the previous fglrx drivers and installing new ones worked (updated catalyst to 12.10 while I was at it). It actually solved a plethora of other issues I was ignoring too, like Steam looking buggy etc etc.