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Thread: openSUSE-11.4: Webcam very dark

  1. #1
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    Default openSUSE-11.4: Webcam very dark

    I've just noticed that my Logitech webcam is totally unusable in openSUSE 11.4. It worked perfectly in 11.3.

    I tried it with Skype-2.1.0.47, -2.1.0.81 and -2.2.0.25 - no change, too dark (but it works though). I wanted to try it with Cheese but it shows me it failed to detect a camera. Tried the Webcam, it also failed to detect the camera. Tried with Kopete - it works but also too dark (the brightness/contrast/gamma barely change anything).

    I also tried both versions of v4l - one from the OSS and one from the Webcam drivers repo - no difference. If I use this Skype command: LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so skype - the camera works but is too dark, if I simply use 'skype' the camera doesn't work.

    Anyone know what's changed from 11.3 to 11.4 and how to fix this? Thank you.
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  2. #2
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    Default Re: openSUSE-11.4: Webcam very dark

    On Fri, 06 May 2011 18:36:01 +0530, linuxoidoz
    <linuxoidoz@no-mx.forums.opensuse.org> wrote:

    >
    > I've just noticed that my Logitech webcam is totally unusable in
    > openSUSE 11.4. It worked perfectly in 11.3.
    >
    > I tried it with Skype-2.1.0.47, -2.1.0.81 and -2.2.0.25 - no change,
    > too dark (but it works though). I wanted to try it with Cheese but it
    > shows me it failed to detect a camera. Tried the Webcam, it also failed
    > to detect the camera. Tried with Kopete - it works but also too dark
    > (the brightness/contrast/gamma barely change anything).



    if you're running a 64bit system, the command to open cheese is

    LD_PRELOAD=/usr/lib64/libv4l/v4l1compat.so cheese

    since cheese is a 64bit app., unlike skype.


    > I also tried both versions of v4l - one from the OSS and one from the
    > Webcam drivers repo - no difference. If I use this Skype command:
    > LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so skype - the camera works but is
    > too dark, if I simply use 'skype' the camera doesn't work.
    >
    > Anyone know what's changed from 11.3 to 11.4 and how to fix this? Thank
    > you.


    this didn't happen to me after upgrading to 11.4. my webcam's still the
    same; perhaps a little better quality with the latest skype beta, but not
    sure about that.

    i've had limited success improving webcam quality using the v4lctl
    command. (there's a man page for that.)

    per example, "v4lctl bright 180", or even 200, increases brightness. the
    command "v4lctl list" lists all attributes the command understand.
    unfortunately, my webcam understands only two or three of them. worth
    playing around with perhaps.


    --
    phani.

  3. #3
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    Default Re: openSUSE-11.4: Webcam very dark

    phanisvara, Thank you for the Cheese command, it worked.

    But video is still dark in both Skype and Cheese. Is it anything to do with the newer webcam driver in openSUSE 11.4?

    PS. Just to clarify - I have good lighting, so it's not that. Something's changed from 11.3 to 11.4.
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  4. #4
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    Default Re: openSUSE-11.4: Webcam very dark

    On Sun, 08 May 2011 06:06:01 +0530, linuxoidoz
    <linuxoidoz@no-mx.forums.opensuse.org> wrote:

    >
    > phanisvara, Thank you for the Cheese command, it worked.
    >
    > But video is still dark in both Skype and Cheese. Is it anything to do
    > with the newer webcam driver in openSUSE 11.4?
    >
    > PS. Just to clarify - I have good lighting, so it's not that.
    > Something's changed from 11.3 to 11.4.
    >


    then it must be due to a different camera; for me there was no change. did
    you try those "v4lctl" commands, to be run from the command line? like
    "v4lctl bright 200", that should brighten up your image; unfortunately
    they tend to get washed out. there are other commands too, for contrast &
    color, but not all cameras understand all of them. look into "man v4lctl"
    for more details.


    --
    phani.

  5. #5
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    Default Re: openSUSE-11.4: Webcam very dark

    it must be due to a different camera
    No, it's the same camera I used in 11.3.

    did
    you try those "v4lctl" commands, to be run from the command line? like
    "v4lctl bright 200", that should brighten up your image; unfortunately
    they tend to get washed out.
    Yes, I tried that and this is exactly what happens.
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  6. #6
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    Default Re: openSUSE-11.4: Webcam very dark

    On Sun, 08 May 2011 13:36:05 +0530, linuxoidoz
    <linuxoidoz@no-mx.forums.opensuse.org> wrote:

    >
    >> it must be due to a different camera

    > No, it's the same camera I used in 11.3.



    i meant difference in cameras between your's and mine. for me nothing
    changed after upgrading to 11.4, for you it did.


    >> did
    >> you try those "v4lctl" commands, to be run from the command line? like
    >> "v4lctl bright 200", that should brighten up your image; unfortunately
    >> they tend to get washed out.

    > Yes, I tried that and this is exactly what happens.



    nothing else comes to mind, unfortunately. would be a strange coincidence
    if your camera went bad at the same time you upgraded. i'd borrow some
    other webcams from friends and see how they perform. after my last one
    died i bought a real cheap one off the shelve, some strange no-name
    assembled god-knows-where, and it works fine. if you find one that works
    ok, just buy a new one?


    --
    phani.

  7. #7
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    Default Re: openSUSE-11.4: Webcam very dark

    On Sun, 08 May 2011 13:36:05 +0530, linuxoidoz
    <linuxoidoz@no-mx.forums.opensuse.org> wrote:

    >
    >> it must be due to a different camera

    > No, it's the same camera I used in 11.3.
    >
    >> did
    >> you try those "v4lctl" commands, to be run from the command line? like
    >> "v4lctl bright 200", that should brighten up your image; unfortunately
    >> they tend to get washed out.

    > Yes, I tried that and this is exactly what happens.
    >


    just seen an interesting post of someone who had a similar problem, and
    his somewhat radical solution. so you're not alone with the problem it
    seems:

    ---------------
    http://forums.opensuse.org/showthread.php?t=458894

    I thought that I would report that I have resolved this issue. It seems
    that the zc3xx driver has been adjusted over time to respond to user
    complaints that *their* quickcams are too dark. The end result is that
    mine is too bright. Sigh.

    I resolved this problem by pulling the latest gspca source (2.12.24)
    from 'here' (http://moinejf.free.fr/) and the 2.6.35.13 kernel source
    from kernel.org. I pulled the files zc3xx-reg.h, zc3xx.c, and
    coarse_expo_autogain.h from the 2.6.35.13 kernel and copied them into
    the gspca build directory and built/installed the drivers. My quickcam
    not behaves as it did under SUSE 11.3.


    --
    JJMT
    ---------------

    --
    phani.

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