[2.6.2-rc1] BTTV, RTC and I2C warning messages
From: Michael Buesch (mbuesch_at_freenet.de)
Date: 01/24/04
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To: kraxel@bytesex.org, frodol@dds.nl, greg@kroah.com Date: Sat, 24 Jan 2004 20:03:39 +0100
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Hi,
I got these messages in the syslog while watching TV with
the "tvtime" application.
Jan 24 18:04:24 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=1b0b6000,rc=1b0b601c]
Jan 24 18:21:54 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=1b0b6000,rc=1b0b601c]
Jan 24 18:29:01 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=d52b000,rc=d52b01c]
Jan 24 18:41:09 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=1b0b4000,rc=1b0b401c]
Jan 24 18:59:21 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=1b0b4000,rc=1b0b401c]
Jan 24 19:27:27 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=d569000,rc=d56901c]
Jan 24 19:40:39 lfs kernel: bttv0: skipped frame. no signal? high irq latency? [main=1fd81000,o_vbi=1fd81018,o_field=1b0b4000,rc=1b0b4264]
Jan 24 19:43:59 lfs kernel: i2c IR (Hauppauge): unknown key: key=0x3f raw=0x3fff down=1
Jan 24 19:43:59 lfs kernel: i2c IR (Hauppauge): unknown key: key=0x3f raw=0x3fff down=0
Jan 24 19:44:27 lfs kernel: rtc: lost some interrupts at 1024Hz.
The "skipped frame" and "lost interrupt" messages were there
forever in kernel 2.6 for me. (I never saw them in 2.4). I had
several threads about them on lkml but nobody could really help me, so
I began to ignore these, as it runs even with them pretty good.
But the new message I got today was the "i2c IR (Hauppauge):" message
Yes, my Happauge WinTV PCI has an IR connector for remote control.
So kernel tells me, that someone pressed an unknown key on the
remote control (I guess this from the message). But the curious thing is:
There's no IR remote-control device connected to the Hauppauge
connection pin for at least a year, now. :) I've no IR-device
connected to any port.
yes, the "rtc" message... . I think it has something to do with that
tvtime uses RTC to display some picture or so. So tvtime accesses
the bttv driver and the rtc driver at once. So my guess: Probably a
race condition here? Probably in the kernel? Who knows... I don't.
mb@lfs:~> cat /proc/interrupts
CPU0
0: 7284059 IO-APIC-edge timer
1: 10495 IO-APIC-edge i8042
2: 0 XT-PIC cascade
4: 49597 IO-APIC-edge serial
8: 7222782 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 279485 IO-APIC-edge i8042
14: 104363 IO-APIC-edge ide0
15: 40 IO-APIC-edge ide1
16: 1160911 IO-APIC-level eth0, nvidia
17: 528152 IO-APIC-level bttv0
19: 64980 IO-APIC-level uhci_hcd, Ensoniq AudioPCI
20: 0 IO-APIC-level ohci_hcd
21: 0 IO-APIC-level ohci_hcd
22: 0 IO-APIC-level ehci_hcd
23: 0 IO-APIC-level uhci_hcd
NMI: 0
LOC: 7284538
ERR: 0
MIS: 0
Yes, somebody told me, that assigning a lower interrupt number to
the bttv card removed the "lost interrupt" messages, but how to do that?
I've tried to move the card around in the pci-slots, but it has always
been assigned the same IRQ. I've tried to set some interrupt options in
the bios, but that also didn't help. Is there any way to tell bttv to use
for example IRQ 11 or something like that? Also loading bttv before
the eth0 driver didn't work. As you see, bttv still has a higher IRQ.
Thanks you for all your help and suggestions.
- --
Regards Michael Buesch [ http://www.tuxsoft.de.vu ]
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