Dean Vanden Heuvel wrote:
Please help. I have not yet discovered the trick for enticing enough folks to read one of the posts such that I might get a helpful response. I am not indicating that readers are not helpful, but rather that I cannot seem to grab their attention. In any case, I hope this subject is more *catchy*...
In any case, I am (and reportedly others are) having a continuing problem with "re-entry" into Live TV mode. In virtually all cases, the first time (post reboot) I try to watch live TV, all is well. When I exit back to the GUI, and attempt to re-enter live TV...failure. Most often this is a segfault, but I have had cases where the on-screen video DOES APPEAR, then freezes, never to restart. Sometimes this happens when I attempt to watch an already recorded program, sometimes not. But ALWAYS, it happens on a re-entry to one of the video display modes. NEVER on the first pass.
I have seen other very similar errors reported, and I have previously posted to this effect on both the users and dev mailing lists. Other similar errors and assorted list postings include include "stuttering video" on the frontend upon re-entry, black screen on re-entry, stuttering audio on re-entry. This appears to afflict a variety of graphics/system hardware (Pundit, Nvidia,...) and a wide variety of system CPU and bus speeds.
I have personally re-created all of the symptoms using kernels from 2.6.5 thru 2.6.9-r4, ivtv versions from 0.1.100z thru 0.3.1t, using a vaiety of ivtv fw modules, using both Xv and XvMC modes. Others report using all sorts of things with strikingly similar issues. The fact that there are various symptoms surrounding this, IMHO, indicates some sort of timing/race, or other multi-task coordination issue, which thus manifests itself slightly differently on each and every distinct combination of HW, SW, settings, and timing. But, the problem is there and appears quite pervasive. If you have not yet experienced it, I think it may be just a matter of time until you hit the *wrong* combination.
BTW, the one and only thing I have been able to use to dramatically improve the situation (now failure only 1 in 4 tries) is to use ALSA sound as opposed to OSS. I was initially encouraged, but the problem persists, albeit reduced.
There is one common thread. The errors ALWAYS occur on re-entry to a video mode. Never on the first pass. Now I ask, "what is different upon re-entry vs. initial entry?". I would be happy to investigate further, if I knew where to start. Any ideas on where the differences might lie?
-dvh _______________________________________________ mythtv-users mailing list [EMAIL PROTECTED] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
I'm having the same issue here.
Here is the error message
ivtv-osd: mode is 720x480x32, linelength=2880
Unable to handle kernel NULL pointer dereference<1>Unable to handle kernel NULL
pointer dereference at virtual address 00000000
printing eip:
00000000
*pde = 00000000
Oops: 0000 [#1]
Modules linked in: ivtv_fb(U) msp3400(U) saa7127(U) saa7115(U) tuner(U) tveeprom
(U) ivtv(U) i2c_algo_bit videodev i2c_core lirc_dev(U) parport_pc lp parport aut
ofs4 sunrpc ipt_REJECT ipt_state ip_conntrack iptable_filter ip_tables xfs dm_mo
d md5 ipv6 uhci_hcd ehci_hcd snd_via82xx snd_ac97_codec snd_pcm_oss snd_mixer_os
s snd_pcm snd_timer snd_page_alloc gameport snd_mpu401_uart snd_rawmidi snd_seq_
device snd soundcore via_rhine mii floppy ext3 jbd
CPU: 0
EIP: 0060:[<00000000>] Tainted: GF VLI
EFLAGS: 00010246 (2.6.9-1.681_FC3)
EIP is at 0x0
eax: 21a7d540 ebx: 02361130 ecx: 21a7d220 edx: 05d3aba4
esi: 1b495140 edi: 00000180 ebp: 21a7d540 esp: 05d3ab48
ds: 007b es: 007b ss: 0068
Process modprobe (pid: 2907, threadinfo=05d3a000 task=1f510e50)
Stack: 021eac97 00000000 00000000 1b4905d0 00000000 00000001 ffffffff 00000030
00000030 00000008 00000000 00000000 00000000 00000000 05d3ab7c 00000400
00000010 00000001 000000ff 021eea7b 021eebbf 1b495140 033f1000 00000000
Call Trace:
[<021eac97>] accel_putcs+0x48c/0x4c7
[<021eea7b>] fb_sysmove_buf_aligned+0x0/0x37
[<021eebbf>] fb_sysmove_buf_unaligned+0x0/0xac
[<0215693a>] find_extend_vma+0x12/0x4f
[<021eb7cb>] fbcon_putcs+0x74/0x7c
[<0222c397>] vt_console_print+0x24d/0x2a3
[<0222c14a>] vt_console_print+0x0/0x2a3
[<021202ed>] __call_console_drivers+0x36/0x40
[<021209e1>] release_console_sem+0x139/0x20b
[<021207d4>] vprintk+0x27f/0x2f5
[<0211937e>] do_page_fault+0x0/0x511
[<02120552>] printk+0xe/0x11
[<021196d1>] do_page_fault+0x353/0x511
[<0211b101>] recalc_task_prio+0x128/0x133
[<0211b101>] recalc_task_prio+0x128/0x133
[<021efaea>] fb_set_var+0x89/0x147
[<0211b15f>] activate_task+0x53/0x5f
[<0211d27c>] autoremove_wake_function+0xd/0x2d
[<0211937e>] do_page_fault+0x0/0x511
[<021eac97>] accel_putcs+0x48c/0x4c7
[<0224a885>] end_that_request_last+0x6c/0x7e
[<021eea7b>] fb_sysmove_buf_aligned+0x0/0x37
[<021eebbf>] fb_sysmove_buf_unaligned+0x0/0xac
[<021eb7cb>] fbcon_putcs+0x74/0x7c
[<02228c70>] do_update_region+0x10f/0x154
[<0222972d>] redraw_screen+0x184/0x1b9
[<0222cb3b>] take_over_console+0x22d/0x2da
[<021ea42e>] fbcon_takeover+0x4a/0x74
[<021ee90d>] fbcon_fb_registered+0x15/0x1a
[<021ee94a>] fbcon_event_notify+0x38/0x62
[<0212f76d>] notifier_call_chain+0x17/0x2b
[<021f0749>] register_framebuffer+0x187/0x193
[<021f1fe9>] fb_alloc_cmap+0x8d/0xa0
[<21824353>] init_module+0x353/0x3af [ivtv_fb]
[<21824000>] init_module+0x0/0x3af [ivtv_fb]
[<0213be92>] sys_init_module+0x207/0x2ef
Code: <3>Debug: sleeping function called from invalid context at include/linux/r
wsem.h:43
in_atomic():0[expected: 0], irqs_disabled():1
[<0211cbcb>] __might_sleep+0x7d/0x8a
[<0215e726>] rw_vm+0x20e/0x47a
[<0215ee70>] get_user_size+0x30/0x57
[<0210682b>] show_registers+0x109/0x15e
[<02106a2f>] die+0x14a/0x241
[<0211937e>] do_page_fault+0x0/0x511
[<0211937e>] do_page_fault+0x0/0x511
[<02119733>] do_page_fault+0x3b5/0x511
[<0224841d>] ll_back_merge_fn+0x109/0x164
[<02249f27>] __make_request+0x2e2/0x5cc
[<0224a3a1>] generic_make_request+0x190/0x1a0
[<0211ba78>] scheduler_tick+0x38f/0x4c0
[<0211b101>] recalc_task_prio+0x128/0x133
[<0211937e>] do_page_fault+0x0/0x511
[<021eac97>] accel_putcs+0x48c/0x4c7
[<021eea7b>] fb_sysmove_buf_aligned+0x0/0x37
[<021eebbf>] fb_sysmove_buf_unaligned+0x0/0xac
[<0215693a>] find_extend_vma+0x12/0x4f
[<021eb7cb>] fbcon_putcs+0x74/0x7c
[<0222c397>] vt_console_print+0x24d/0x2a3
[<0222c14a>] vt_console_print+0x0/0x2a3
[<021202ed>] __call_console_drivers+0x36/0x40
[<021209e1>] release_console_sem+0x139/0x20b
[<021207d4>] vprintk+0x27f/0x2f5
[<0211937e>] do_page_fault+0x0/0x511
[<02120552>] printk+0xe/0x11
[<021196d1>] do_page_fault+0x353/0x511
[<0211b101>] recalc_task_prio+0x128/0x133
[<0211b101>] recalc_task_prio+0x128/0x133
[<021efaea>] fb_set_var+0x89/0x147
[<0211b15f>] activate_task+0x53/0x5f
[<0211d27c>] autoremove_wake_function+0xd/0x2d
[<0211937e>] do_page_fault+0x0/0x511
[<021eac97>] accel_putcs+0x48c/0x4c7
[<0224a885>] end_that_request_last+0x6c/0x7e
[<021eea7b>] fb_sysmove_buf_aligned+0x0/0x37
[<021eebbf>] fb_sysmove_buf_unaligned+0x0/0xac
[<021eb7cb>] fbcon_putcs+0x74/0x7c
[<02228c70>] do_update_region+0x10f/0x154
[<0222972d>] redraw_screen+0x184/0x1b9
[<0222cb3b>] take_over_console+0x22d/0x2da
[<021ea42e>] fbcon_takeover+0x4a/0x74
[<021ee90d>] fbcon_fb_registered+0x15/0x1a
[<021ee94a>] fbcon_event_notify+0x38/0x62
[<0212f76d>] notifier_call_chain+0x17/0x2b
[<021f0749>] register_framebuffer+0x187/0x193
[<021f1fe9>] fb_alloc_cmap+0x8d/0xa0
[<21824353>] init_module+0x353/0x3af [ivtv_fb]
[<21824000>] init_module+0x0/0x3af [ivtv_fb]
[<0213be92>] sys_init_module+0x207/0x2ef
Bad EIP value.
-- ---- Jim Gifford [EMAIL PROTECTED]
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