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Old 06-03-2007, 04:09 PM   #1
LQ Newbie
Registered: Dec 2005
Posts: 1

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irw kills lircd on Ubuntu 7.04 (w/MythTV)

Hi all,
I'm trying to setup a homebrew serial IR receiver to work with a MythTV installation on Ubuntu 7.04. I've been following the instructions on, but when I get to the part that has me start lircd and run irw, I run into problems that I'm too naive to fix.

So when I run "sudo /usr/sbin/lircd -n --driver=default -d /dev/lirc0", I get the following response:

lircd-0.8.2-CVS[8678]: repeat_gap will be ignored if CONST_LENGTH flag is set
lircd-0.8.2-CVS[8678]: lircd(userspace) ready

Then in another terminal (tab), I run "irw", which kills the lircd command immediately and generates the following lines in the first tab:

lircd-0.8.2-CVS[8678]: accepted new client on /dev/lircd
lircd-0.8.2-CVS[8678]: could not open /dev/lirc0
lircd-0.8.2-CVS[8678]: default_init(): Device or resource busy
lircd-0.8.2-CVS[8678]: caught signal

"lsmod | grep lirc" shows the following:

lirc_serial 14080 0
lirc_dev 15988 1 lirc_serial

"dmesg" shows the following new lines:

[92062.233994] IRQ handler type mismatch for IRQ 3
[92062.234011] current handler: acpi
[92062.234064] [<c015410e>] setup_irq+0x12e/0x1e0
[92062.234094] [<c0109646>] read_tsc+0x6/0x10
[92062.234130] [<e05274a0>] irq_handler+0x0/0x5d0 [lirc_serial]
[92062.234147] [<c0154263>] request_irq+0xa3/0xc0
[92062.234165] [<e0528200>] set_use_inc+0xb0/0x1f4 [lirc_serial]
[92062.234181] [<e0405a43>] irctl_open+0xe3/0x240 [lirc_dev]
[92062.234196] [<c017eff5>] may_open+0x65/0x260
[92062.234222] [<c01ed6af>] kobject_get+0xf/0x20
[92062.234233] [<e0405960>] irctl_open+0x0/0x240 [lirc_dev]
[92062.234245] [<c0179458>] chrdev_open+0xa8/0x170
[92062.234262] [<c01793b0>] chrdev_open+0x0/0x170
[92062.234269] [<c0174caa>] __dentry_open+0xba/0x1c0
[92062.234302] [<c0174e65>] nameidata_to_filp+0x35/0x40
[92062.234316] [<c0174ec0>] do_filp_open+0x50/0x60
[92062.234367] [<c0174f1e>] do_sys_open+0x4e/0xf0
[92062.234387] [<c0174ffc>] sys_open+0x1c/0x20
[92062.234397] [<c01031f0>] sysenter_past_esp+0x69/0xa9
[92062.234437] =======================
[92062.234600] lirc_serial: IRQ 3 busy

I don't know enough about serial ports and IRQs to know why IRQ 3 is busy.

Any help would be appreciated!


feisty fawn, irw, lirc, ubuntu

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