On Tue, Apr 21, 2015 at 9:49 PM, Kynn Jones <kyn...@gmail.com> wrote:
> OK, I found a way to turn off one of the two snd_hda_intel,
> but it turned out to be the one on IRQ 45. (In any case,
> doing this did not solve the problem.) The method I used was
> 1. find the prefix of the audio device(s) in the output of lspci
> 2. search for a path under /sys/devices with this prefix in the basename
> 3. add a line of the form
> echo 1 > /path/found/in/previous/step/remove
> When did step (1) I found two candidate prefixes 00:03.0 and 00.1b.0,
from the lines
> 00:03.0 Audio device: Intel Corporation Haswell HD Audio Controller
(rev 06)
> 00:1b.0 Audio device: Intel Corporation Lynx Point High Definition
Audio Controller (rev 04)
> but in step (2) I was able to find only one matching path, namely
> /sys/devices/pci0000:00/0000:00:1b.0
Correction: when I looked again I did find a file for 00.03.0:
/sys/devices/pci0000:00/0000:00:03.0
I'm not sure why I missed it the first time.
> I went ahead and added the line
> echo 1 > /sys/devices/pci0000:00/0000:00:1b.0/remove
> to /etc/rc.local, and rebooted.
I repeated the same thing once more with this line instead:
echo 1 > /sys/devices/pci0000:00/0000:00:03.0/remove
...and now after rebooting the IRQ 16 line of /proc/interrupts
shows only one driver:
# grep '^ 16:' /proc/interrupts
16: 1211 0 0 0 IR-IO-APIC-fasteoi
ehci_hcd:usb1
But, unfortunately, this turned out to be a red herring: the
unhandled IRQ 16 error continues to happen, and along with it the
mouse that, as it were, "wakes drunk from sleep". (At least the
system's sound continues to work fine, AFAICT.)
Now it looks like the problem is with the ehci_hcd driver.
In this case, I don't think that disabling the driver is an
option, so I decided to send a full bug report to the
debian-kernel list, here:
https://lists.debian.org/debian-kernel/2015/04/msg00348.html
Putting aside the main issue (the problem with the mouse) I now
have the additional (but far less pressing) question of which of
the two instances of snd_hda_intel I should keep around?
kj
