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Old 05-30-2011, 01:41 AM
Default 11.04 webcam fail (was: ecryptfs problem after update)

On 2011-05-27, John Thompson <john@os2.dhs.org> wrote:
> I just updated my xubuntu-9.10 system to 10.10 (would have gone to 11.04,
> but the installer kept crashing). I told the installer to leave my /home
> filesystem alone -- and it did -- but now I can't access the encrypted
> data in my home directory. I have the unwrapped passphrase from the 9.10
> installation but can't find any info on how to use it to access my data.
> I have tried using "ecryptfs-mount-private" but it complains "ERROR:
> Encrypted private directory is not set up properly" and bails.
> Whither now?

I manager to install xubuntu-11.04 by using the "alternate" install media,
yay! Used "ecryptfs-recover-private" to access my encrypted $HOME, copied
it out to a new directory, updated pointers, etc. & seems to be working
now, mostly. $HOME is unencrypted at the moment, but once I feel motivated
I can change that.

Alas, my built-in webcam is not working! It worked fine right out of the
box with xubuntu-9.10, but no more. Hardware is Acer Aspire One "ZG8" with
2Gb RAM. Cheese complained about "No device found," "v4l2-ctl --list-devices"
complains "Failed to open /dev/video0: No such file or directory." Sure 'nuff,
there is no "/dev/video0." Isn't the device mapper supposed to create these
devices? Whatever. I do "mknod /dev/video0 c 81 0" to create the device file,
but no joy:

root@stolat:/dev# v4l2-ctl --list-devices
Failed to open /dev/video0: No such device or address
root@stolat:/dev# ls -l /dev/video0
crw-r--r-- 1 root root 81, 0 2011-05-29 20:25 /dev/video0

lsmod shows:

root@stolat:~# lsmod|grep uvc
uvcvideo 66851 0
videodev 75143 3 uvcvideo,bttv,v4l2_common

So what's wrong now?


-John (john@os2.dhs.org)

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