Hi for the last 3 kernels i have been getting errors and hangs that ultimately end in a completely frozen system this is the error that appears in the in the log Mar 07 11:00:43 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 4 Get 0xfffffffffc Put 0x0000fffff8 IbGet 0x000001fe IbPut 0x000001ff State 0xc0040022 (err: MEM_FAULT) Push 0x00400040 Mar 07 11:45:27 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x002002893c Put 0x0020029774 IbGet 0x0000035a IbPut 0x0000035b State 0x80004861 (err: INVALID_CMD) Push 0x00400040 Mar 07 11:54:36 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 4 Get 0xfffffffffc Put 0x0000fffff8 IbGet 0x00000237 IbPut 0x00000238 State 0xc0040022 (err: MEM_FAULT) Push 0x00400040 Mar 07 12:00:14 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x002002bd20 Put 0x002002bd80 IbGet 0x000002ff IbPut 0x00000300 State 0xc0000020 (err: MEM_FAULT) Push 0x00400040 Mar 07 12:16:33 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x002002d538 Put 0x002002d554 IbGet 0x00000243 IbPut 0x00000244 State 0x80000314 (err: INVALID_CMD) Push 0x00400040 Mar 07 12:21:09 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x0020035140 Put 0x002003af14 IbGet 0x00000362 IbPut 0x00000365 State 0x80004861 (err: INVALID_CMD) Push 0x00400040 Mar 07 12:25:06 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x0020030ad4 Put 0x0020030b8c IbGet 0x000001bc IbPut 0x000001bf State 0xc0000020 (err: MEM_FAULT) Push 0x00400040 Mar 07 12:25:42 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x0020037348 Put 0x0020037e78 IbGet 0x0000035a IbPut 0x0000035b State 0xc0004861 (err: MEM_FAULT) Push 0x00400040 Mar 07 13:02:36 7-of-9 kernel: delay: estimated 192, actual 0 Mar 07 13:04:22 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 4 Get 0x00200d4984 Put 0x00200d4d1c IbGet 0x00000250 IbPut 0x00000251 State 0x8000745c (err: INVALID_CMD) Push 0x00400040 Mar 07 13:04:22 7-of-9 kernel: nouveau E[ PGRAPH][0000:01:00.0] DATA_ERROR INVALID_BITFIELD Mar 07 13:04:22 7-of-9 kernel: nouveau [ PGRAPH][0000:01:00.0] DATA_ERROR Mar 07 13:04:22 7-of-9 kernel: nouveau E[ PGRAPH][0000:01:00.0] ch 4 [0x003f96e000] subc 3 class 0x8597 mthd 0x1458 data 0xffffffff Mar 07 13:04:22 7-of-9 kernel: nouveau E[ PFB][0000:01:00.0] trapped read at 0x0000000000 on channel 0x0003f96e PFIFO/PFIFO_READ/PUSHBUF reason: PT_NOT_PRESENT Mar 07 13:11:59 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x0020008fe4 Put 0x0020008ff8 IbGet 0x00000327 IbPut 0x00000329 State 0x80000064 (err: INVALID_CMD) Push 0x00400040 Mar 07 13:11:59 7-of-9 kernel: nouveau [ PFIFO][0000:01:00.0] CACHE_ERROR - Ch 2/0 Mthd 0x0060 Data 0xffffffff at present running KDE 4.10.1 kernel 3.7.10-1 4Gb ram currently running with 2.56Gib free memory video card is a GeForce GT220 @1Gb memory. Twin monitors USB external sound card (onboard card is pants) New install middle of January Thanks Pete . -- Linux 7-of-9 3.7.10-1-ARCH #1 SMP PREEMPT Thu Feb 28 09:50:17 CET 2013 x86_64 GNU/Linux