On Wed, 2009-08-26 at 07:33 -0700, Dalton Harvie wrote:
> Hi,
>
> I'm no expert with this stuff but have been using mythtv under ubuntu
> for a while. Lately the machine became quite sluggish.
>
> I have two Leadtek 1000DTV cards and a usb remote in a ubuntu 8.04
> (2.6.24-24-generic) machine with the standard packaged kernel.
>
> >From /var/log/dmesg
> [ 56.656386] cx88[0]: subsystem: 107d:665f, board: WinFast DTV1000-T
> [card=35,autodetected]
>
>
> I installed powertop and found that there were 500 wakeups/s occuring
> from `run_workqueue (ir_timer)' which I assume is to do with polling
> the built in remote receiver on these tuner cards. I no longer use
> these Leadtek remotes, instead using a mceusb type one - so would like
> to stop this polling.
>
> I tried a hack with my limited c knowledge - I edited cx88-input.c to
> remove all references to the DTV1000 card (two places) and recompiled
> the modules. Now the rapid polling has gone. The reponse of the new
> mceusb remote seems to be much better now too. The problem is that I
> don't want to have to recompile these modules each time there is an
> update package to the kernel available.
>
> My question is - is there any way to stop this polling without having
> to recompile the modules? Some option to pass to them maybe?
No. No.
> If there isn't, would it be a good idea?
Maybe.
> Thanks for any help.
Try this. It adds a module option "noir" that accepts an array of
int's. For a 0, that card's IR is set up as normal; for a 1, that
card's IR is not initialized.
# modprobe cx88 noir=1,1
Regards,
Andy
cx88: Add module option for disabling IR
If an IR receiver isn't in use, there's no need to incurr the penalties
for polling.
Reported-by: Dalton Harvie <dalton_harvie@xxxxxxxxxxxx>
Signed-off-by: Andy Walls <awalls@xxxxxxxxx>
diff -r 28f8b0ebd224 linux/drivers/media/video/cx88/cx88-cards.c
--- a/linux/drivers/media/video/cx88/cx88-cards.c Sun Aug 23 13:55:25 2009 -0300
+++ b/linux/drivers/media/video/cx88/cx88-cards.c Wed Aug 26 19:23:17 2009 -0400
@@ -32,14 +32,17 @@
static unsigned int tuner[] = {[0 ... (CX88_MAXBOARDS - 1)] = UNSET };
static unsigned int radio[] = {[0 ... (CX88_MAXBOARDS - 1)] = UNSET };
static unsigned int card[] = {[0 ... (CX88_MAXBOARDS - 1)] = UNSET };
+static unsigned int noir[] = {[0 ... (CX88_MAXBOARDS - 1)] = UNSET };
module_param_array(tuner, int, NULL, 0444);
module_param_array(radio, int, NULL, 0444);
module_param_array(card, int, NULL, 0444);
+module_param_array(noir, int, NULL, 0444);
MODULE_PARM_DESC(tuner,"tuner type");
MODULE_PARM_DESC(radio,"radio tuner type");
MODULE_PARM_DESC(card,"card type");
+MODULE_PARM_DESC(noir, "disable IR (default: 0, IR enabled)");
static unsigned int latency = UNSET;
module_param(latency,int,0444);
@@ -3490,7 +3493,8 @@
}
cx88_card_setup(core);
- cx88_ir_init(core, pci);
+ if (!noir[core->nr])
+ cx88_ir_init(core, pci);
return core;
}
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