[mythtv-users] judder problems with nvidia 358.16

Thu Mar 17 07:25:25 UTC 2016

Hi again,

On Tuesday, March 15, 2016 09:11 CET, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
 maybe nvctrl extensions was removed from the nvidia drivers.

Would have to implement the new xrandr

which version of xrandr do you have ?1.5
On 15 March 2016 at 01:34, Marius Schrecker <marius.schrecker at lyse.net> wrote:
...
>
> On Tuesday, 8 March 2016, Marius Schrecker <marius.schrecker at lyse.net>
> wrote:
>>
>> Stupid of me not to check that! The GUI refresh rates are the NVIDIA
>> "false" rates: 50Hz, 51 Hz, 52 Hz, etc..
>>
>>
>
>
> That's what your problem is then, 50Hz is the closest to 23.93. So myth is
> doing the right thing as far as its concerned.
>
> Which version of Xrandr do you have installed?
>
> libxrandr2 : 1.5
>
> Myth only supports 1.2 or the nvidia X extension(libnvctrl) , but this needs
> to be installed and present.
> Normally the nvidia installer would install it automatically.
>
>The strange thing is that the nvidia settings panel displays The NV-CONTROL version - 1.29 I think (will check), but I can't find any reference to the library file that it's using and X-org is certainly failing to find/load it.

Neither can I find a library that is recognisable as the control extension in any of the Nvidia installer tarballs that I nhave looked at - latest attempt being 352.x which was reported as working by another user.  So I think that the problem may still exist between the chair and the keyboard ;).

yesterday I decided to give up and disable dynamic twin view, by setting it "false" in xorg.conf

 To my dismay the problem persists and I still see the "false" refresh rates in mythtv settings
> Hmmmm. This is proving to be black magic. Explicitly adding the module load
> directive to xorg conf does result in:
>
> 343408.826] (II) LoadModule: "nv-control"
> [343408.826] (WW) Warning, couldn't open module nv-control
> [343408.826] (II) UnloadModule: "nv-control"
> [343408.826] (II) Unloading nv-control
> [343408.826] (EE) Failed to load module "nv-control" (module does not exist,
> 0)
>
>
> So I started digging.
>
> There IS a Ubuntu package called:
>
> libxnvctrl0
>
> so I installed it.
> # apt-cache show libxnvctrl0
> Package: libxnvctrl0
> Priority: optional
> Section: libs
> Installed-Size: 74
> Maintainer: Ubuntu MOTU Developers <ubuntu-motu at lists.ubuntu.com>
> Original-Maintainer: Debian NVIDIA Maintainers
> <pkg-nvidia-devel at lists.alioth.debian.org>
> Architecture: amd64
> Source: nvidia-settings
> Version: 352.21-0ubuntu1
> Depends: libc6 (>= 2.14), libx11-6 (>= 2:1.4.99.1), libxext6
> Filename: pool/main/n/nvidia-settings/libxnvctrl0_352.21-0ubuntu1_amd64.deb
> Size: 11534
> MD5sum: 69b4410f3c2428d3e2bfbc851ae3f4b2
> SHA1: 1a0ef460048106be1fed88d668d53680767a1a69
> SHA256: 9f81e8f9e8c10551e047dad6de23800fd9d69365f32bb2419da16851b4f7c6c8
> Description-en: NV-CONTROL X extension (runtime library)
> The NV-CONTROL X extension provides a mechanism for X clients to
> query and set configuration parameters of the NVIDIA X driver.
> State set by the NV-CONTROL X extension is assumed to be persistent
> only for the current server generation.
> .
> This package contains the shared library.
> Description-md5: 6d4f8aebac836277193a58e922a49603
> Bugs: https://bugs.launchpad.net/ubuntu/+filebug
> Origin: Ubuntu
> Supported: 9m
>
>
> The version is 352.21-0ubuntu1 >> and itseems to install the library file libXNVCtrl.so to /usr/lib:
>
> # locate libXNVCtrl.so
> /usr/lib/libXNVCtrl.so.0
> /usr/lib/libXNVCtrl.so.0.0.0
>
>
> (NOT to "/usr/lib/xorg/modules") which is where Xorg is expecting to find
> them.
>
> Question 1: Should I symlink?
>
> I then looked in the nvidia driver source for traces of the same library,
> but found nothing, so either it has a different name here or needs to be
> downloaded separately, but I have yet to find where.
>
> As the packaged version of the livrary was 352.21, I decided to try again to
> install the same version of the driver, first using the sgfxi script (which
> refuses), then using the pre-packaged version, which looses my nvidia GLX> extension.>
> So that's where I am so far.
>
> Maybe the control library doesn't need to be in the same version as the
> rest of the driver, in which case I could reinstall 358 or 361 from source
> (sgfxi or manual build) and run against libXNVCtrl 352.21 symlinked to
> /usr/lib/xorg/modules
>
> Otherwise I do need to work out where to find or how to build the version
> of the library matching a buildable driver.
>
> any clues?
>
> BR.
>
> --Marius--
>
>
>
>
>
>
> If you completely clear any nvidia drivers and install from nvidia official
> installer. Does it work?
>
> When starting X do you see any error about not being able to load the nvctrl
> X extension?
>
> Do you see anything in mythtv log about being enable to access it?
>
> That would explain why you are seeing this.
>
> An alternative is to disable nvidia TwinView; then the refresh rates
> reported to Xrandr will be the real ones (though as Xrandr 1.4 and earlier
> can only deal with integers, you will only get things like 24, 25, 30 50,
> 60, not 59.997)
>
>
>>
>> Then it will automatically set your screen to the right refresh rate,
>> provided your screen supports it.
>>
>> (To test if changing refresh rate works, when you play with xrandr do you
>> see the refresh rate the screen is getting changing?)
>>>
>>>
>>
>> Xrandr reports and sets the real refresh rates (confirmed with TV)
>>
>>
>> In the meantime I also added the mythuser (login user) to audio and set up
>> limits.conf as per the wiki.
>
>
> Don't need that IMHO.
> Those instructions were written like 10 years ago, all obsolete with the new
> audio stack which was added like in 2009 or something!
>
>>

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