[mythtv-users] Mythbuntu 16.04 and nvidia drivers

[Klaas de Waal]

Mythbuntu with nvidia driver 367.57 gives the same frame rate problem on my
GT520 card. Downgrading to nvidia driver 340.98 with the "Software &
Updates" app of Ubuntu solves the problem.

The puzzling part is that if you manually specify a framerate with xrandr,
e.g. "sudo xrandr --display :0 --rate 51" with the rate from 50 to 64, each
rate value gives the same frequency setting for both drivers. This suggests
it could be a change in the binary interface to the driver that causes
MythTV to set the wrong frequency.


On Wed, Dec 7, 2016 at 9:39 PM, klaas de waal <klaas at kldo.nl> wrote:

> Mythbuntu with nvidia driver 367.57 gives the same frame rate problem on
> my GT520 card. Downgrading to nvidia driver 340.98 with the "Software &
> Updates" app of Ubuntu solves the problem.
>
> The puzzling part is that if you manually specify a framerate with xrandr,
> e.g. "sudo xrandr --display :0 --rate 51" with the rate from 50 to 64, each
> rate value gives the same frequency setting for both drivers.
>
>
>
> On Wed, Dec 7, 2016 at 5:55 PM, John Finlay <finlay at moeraki.com> wrote:
>
>> On 12/7/2016 3:04 AM, Hika van den Hoven wrote:
>> > Hoi John,
>> >
>> > Wednesday, December 7, 2016, 10:19:14 AM, you wrote:
>> >
>> >
>> >
>> >> On 12/06/2016 11:15 PM, Marius Schrecker wrote:
>> >>> Thanks Hika,
>> >>>
>> >>> On Tuesday, December 6, 2016 17:43 CET, Hika van den Hoven
>> >>> <hikavdh at gmail.com> wrote:
>> >>>
>> >>>> Hoi Marius,
>> >>>>
>> >>>> Tuesday, December 6, 2016, 10:48:03 AM, you wrote:
>> >>>>
>> >>>>> Hi,
>> >>>>> ARound the time that 16.04 came out I did an upgrade of an older
>> >>>>> mythbuntu system with a GT610 video adapter and hit problems with
>> >>>>> the nvidia nv-control module, which wasn't allowing mythtv to match
>> >>>>> the monitor refresh rate to the frame rate of the content I was
>> >>>> trying to play.
>> >>>>
>> >>>>> I tried "everything" at the time, using all the available versions
>> >>>>> I could easily install using packages, scripted installers and
>> >>>>> vanilla nvidia installer, all with no success. I eventually gave up
>> >>>>> and lived with the problem, allowing the available drivers,
>> >>>>> packages, mythtv code to mature over time before trying again.
>> >>>>> I haven't had much time since to play with mythtv, but last night,
>> >>>>> for the hell of it, after being irritated again with the jumpy
>> >>>>> video, I decided to downgrade from the version that was installed (I
>> >>>>> can't remember now whether it was 358, 361 or 364) to 340, which was
>> >>>>> mentioned in another recent thread regarding a working driver for
>> >>>> legacy cards.
>> >>>>
>> >>>>> I rebooted and was surprised and pleased to see that the refresh
>> >>>>> rates were now being set correctly... Problem solved!
>> >>>>> However, as we have now moved on quite a bit since April and as
>> >>>>> there are newer driver versions available, does anyone know if
>> >>>>> something changed radically since 340 in the way Nvidia handles
>> >>>> refresh rates?
>> >>>>
>> >>>>> Can anyone say which driver version might now be considered optimal
>> >>>> for the GT610 on a mythTV system?
>> >>>>
>> >>>>> I'm a bit wary about breaking again whatever fixed itself
>> >>>>> yesterday, so don't want to just blindly cycle through the driver
>> >>>> versions.
>> >>>>
>> >>>>> BR.
>> >>>>> --Marius--
>> >>>>>
>> >>>>
>> >>>> http://www.nvidia.com/object/IO_32667.html
>> >>>>
>> >>> Hmm, so the GT 610 isn't there as it's not considered lagacy hardware.
>> >>> All the same, the driver seems to work far better than the version I
>> >>> had installed before. At least when it comes to updating refresh
>> rates.
>> >>>
>> >>> Any other GT610 users out there:Please can you say which nvidia driver
>> >>> you're using with Myth?
>> >>>
>> >>>  Thanks
>> >>>
>> >> I have a FE with a GT610 that successfully uses the 367.57 driver in
>> >> Mythbuntu 16.04.
>> >> John
>> >> _______________________________________________
>> > Ah, but Nvidia itself does not guaranty that! If I remember correct
>> > they place it as a 340 legacy card. It's some time ago I
>> > used/installed a GT610. I guess you will see warnings in your bootlog
>> > about things not working properly.
>> >
>> >
>> >
>>
>> The 367.57 was the driver installed by Mythbuntu 16.04 during
>> installation. I had to install 16.04 from scratch since the upgrade from
>> 14.04 failed miserably. I checked the log and I don't see any error
>> messages and from my use so far it looks good. When using 14.04 I was
>> using 340.98 and it also worked well.
>>
>> John
>> _______________________________________________
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>>
>
>
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