My KnoppMyth setup has been working great except for one thing. If I leave it on live TV for several hours, the display locks up. I see a frozen image on the screen and hear a buzz coming out of the speakers. I'm able to ssh to the box, but haven't been able to figure out a way to get it working again except by rebooting.

Any advice on tracking down what's going wrong? The last lockup happend at around 17:00 this evening. Here's a snippet from mythbackend.log:

2006-10-13 19:00:01.349 Finished recording The Simpsons "Homer and Ned's Hail Mary Pass": channel 10225
2006-10-13 19:00:01.703 TVRec(1): Enabling Full LiveTV UI.
[mpeg @ 0xb713c278]Parser not found for Codec Id: 94210 !
2006-10-13 19:00:02.288 TVRec(1): RingBufferChanged()
2006-10-13 19:00:02.322 Finished recording The Simpsons "Homer and Ned's Hail Mary Pass": channel 10225
0: start_time: 808.459 duration: 162.018
1: start_time: 218.520 duration: 162.022
2: start_time: 808.417 duration: -9223372036854.775
stream: start_time: 2428.000 duration: 8355.072 bitrate=1115 kb/s
2006-10-13 19:00:05.426 AFD: Opened codec 0x82104e0, id(MPEG2VIDEO) type(Video)
2006-10-13 19:00:05.430 AFD: Opened codec 0x82161b0, id(MP2) type(Audio)

There's some weirdness in /var/log/messages, but I have no idea what it means. Can't tell if it's just the mlnet process crashing or a bigger problem.

Oct 13 18:59:44 mythtv kernel: Modules linked in: snd_pcm_oss sg i2c_viapro ehci_hcd shpchp pci_hotplug analog 8250_pnp pcspkr lirc_serial cx8800 cx88xx ir_common ivtv_fb \
ivtv lirc_i2c lirc_dev ipv6 ttusb_dec ttusbdecfe dvb_ttusb_budget cx22700 budget_av tda10021 budget_ci budget s5h1420 budget_core dvb_ttpci l64781 tda8083 stv0297 sp8870 t\
tpci_eeprom saa7146_vv saa7146 mt312 dvb_bt8xx nxt6000 mt352 dvb_pll sp887x dst_ca or51211 lgdt330x tda1004x ves1820 stv0299 dst bt878 cx24110 bttv i2c_algo_bit btcx_risc \
ves1x93 dvb_core video_buf v4l2_common evdev v4l1_compat videodev usbhid skge autofs4 af_packet snd_mixer_oss snd_via82xx gameport snd_ac97_codec snd_ac97_bus snd_pcm snd_\
timer snd_page_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore tda9887 msp3400 saa7127 saa7115 tuner tveeprom i2c_core via_rhine mii via_agp agpgart via_irc\
c irda crc_ccitt parport_pc parport 8250 serial_core pcmcia firmware_class yenta_socket rsrc_nonstatic pcmcia_core video thermal processor fan container button battery ac
Oct 13 18:59:44 mythtv kernel: tc ohci1394 ieee1394 usb_storage ohci_hcd uhci_hcd usbcore a100u2w megaraid tmscsim BusLogic tsdev
Oct 13 18:59:44 mythtv kernel: CPU: 0
Oct 13 18:59:44 mythtv kernel: EIP: 0060:[cache_alloc_refill+216/496] Not tainted VLI
Oct 13 18:59:44 mythtv kernel: EFLAGS: 00010046 (2.6.15-chw-2)
Oct 13 18:59:44 mythtv kernel: EIP is at cache_alloc_refill+0xd8/0x1f0
Oct 13 18:59:44 mythtv kernel: eax: a0a0a0a0 ebx: 00000003 ecx: c9fc8000 edx: cffed7c0
Oct 13 18:59:44 mythtv kernel: esi: cffed7c0 edi: c9fc801c ebp: cffe5a00 esp: c5611d88
Oct 13 18:59:44 mythtv kernel: ds: 007b es: 007b ss: 0068
Oct 13 18:59:44 mythtv kernel: Process mlnet (pid: 18414, threadinfo=c5610000 task=c0532030)
Oct 13 18:59:44 mythtv kernel: Stack: c9fc801c cffed7c8 cffed7e8 cffef180 00000282 000000d0 c5611e4c c01558e0
Oct 13 18:59:44 mythtv kernel: cffef180 000000d0 cbebc598 000000d0 c133f580 c0182c2c 00000034 000000d0
Oct 13 18:59:44 mythtv kernel: fffffff4 c3dd23e8 c1cfd0dc c5611e4c c0178a2a c3dd23e8 c5611e4c c5611e4c
Oct 13 18:59:44 mythtv kernel: Call Trace:
Oct 13 18:59:44 mythtv kernel: [__kmalloc+96/112] __kmalloc+0x60/0x70
Oct 13 18:59:44 mythtv kernel: [d_alloc+364/400] d_alloc+0x16c/0x190
Oct 13 18:59:44 mythtv kernel: [real_lookup+122/192] real_lookup+0x7a/0xc0
Oct 13 18:59:44 mythtv kernel: [do_lookup+110/128] do_lookup+0x6e/0x80
Oct 13 18:59:44 mythtv kernel: [__link_path_walk+1785/3504] __link_path_walk+0x6f9/0xdb0
Oct 13 18:59:44 mythtv kernel: [ext3_count_free_inodes+41/80] ext3_count_free_inodes+0x29/0x50
Oct 13 18:59:44 mythtv kernel: [ext3_count_free_inodes+64/80] ext3_count_free_inodes+0x40/0x50
Oct 13 18:59:44 mythtv kernel: [link_path_walk+71/224] link_path_walk+0x47/0xe0
Oct 13 18:59:44 mythtv kernel: [path_lookup+147/336] path_lookup+0x93/0x150
Oct 13 18:59:44 mythtv kernel: [__user_walk+35/64] __user_walk+0x23/0x40
Oct 13 18:59:44 mythtv kernel: [vfs_stat+23/80] vfs_stat+0x17/0x50
Oct 13 18:59:44 mythtv kernel: [sys_stat64+17/48] sys_stat64+0x11/0x30
Oct 13 18:59:44 mythtv kernel: [swapwriter_release_storage+80/176] swapwriter_release_storage+0x50/0xb0
Oct 13 18:59:44 mythtv kernel: [do_IRQ+38/48] do_IRQ+0x26/0x30
Oct 13 18:59:44 mythtv kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Oct 13 18:59:44 mythtv kernel: Code: 55 00 8b 51 10 8b 41 14 42 89 51 10 8b 3c 24 8b 04 87 89 41 14 8b 44 24 20 3b 50 58 73 06 4b 83 fb ff 75 c1 8b 51 04 8b 01 89 02 <89> \
50 04 c7 01 00 01 10 00 c7 41 04 00 02 20 00 83 79 14 ff 0f
Oct 13 18:59:44 mythtv kernel: <6>note: mlnet[18414] exited with preempt_count 1

Way back in R5A22 days, I had a similiar problem. I can't remember the exact setting, but it was something like "ring buffer" that I had set at 10GB. The problem was the actual size of the buffer was 9.xxx GB. I changed the setting to 9GB and never had a problem after that.

I should be clear that I haven't experienced this problem since then (on any of the later KM versions). And I'm just throwing out the suggestion based on the described behavior (live tv locking up after several hours), not based on anything you posted in your log files.

If you need more detail, let me know and I'll see if I can look it up on my mythbox at home.

Thanks for following up. I've decided to try switching to a VIA EPIA setup. Not because of this--primarily because the existing Celeron box I have is too loud, hot and inefficient. Hopefully once I switch hardware, this problem will just go away. I'll let you know if it still happens with the new box.