proprietary nvidia drivers broken since 16.04 [SOLVED!]

[Peter Silva]

So I got nvidia prime working with the nvidia-367, but:
  -- could not switch live (aka bumblebee/primus/optirun)
  -- when running in intel mode (prime-select intel) Chrome browser
would hang in individual windows a lot.  could not even get
into chrome://settings to change anything...
  -- laptop ran really hot.


So I went back to entirely stock repos (so nvidia-361), and followed
these instructions to get bumblebee/optirun/primus working:

https://lenovolinux.blogspot.ca/2016/05/bumblebee-on-lenovo-t440p-nvidia-gt.html

Had to do it a couple of times because various bits got corrupted by
various other activities, but eventually got to the point where it all
appeared correct, but even then I was getting:

blacklab% optirun glxinfo
[  102.026241] [ERROR]Cannot access secondary GPU - error: [XORG] (EE)

[  102.026271] [ERROR]Aborting because fallback start is disabled.
blacklab%

found this:
https://github.com/Bumblebee-Project/Bumblebee/issues/749

"If you are on Debian testing/unstable or ubuntu 16.04 or any
derivative with Xorg >= 1.18, make sure you don't have
xserver-xorg-legacy installed, as it's incompatible with bumblebee."

 apt-get purge xserver-xorg-legacy

( This is perhaps because laptop was 14.04 upgraded to 16.04. )

now it all works.  Default Intel GPU, and I put 'primusrun %command%"
to run games, and it uses the nvidia gpu just for that.

runs much cooler in general.


On Sat, Jul 2, 2016 at 2:18 PM, Ralf Mardorf <silver.bullet at zoho.com> wrote:
> Consider to at least inform us about the output of
>
>   $ grep EE /var/log/Xorg.0.log
>
> On Sat, 2 Jul 2016 12:50:52 -0400, Peter Silva wrote:
>>Advice about who to submit a bug report to would be helpful:
>
> Ubuntu packages:
> https://help.ubuntu.com/community/ReportingBugs
> I prefer to report bugs the classical way, by logging in and using
> https://bugs.launchpad.net/ubuntu or by directly reporting bugs
> upstream.
>
> Perhaps NVIDIA upstream bugs could be reported here, but consider to
> use a search engine:
> http://www.nvidia.com/object/driverqualityassurance.html
>
>>not some vendor script that will break at every kernel
>>upgrade.
>
> There most likely is a way for apt(-get) hooks, so that dkms
> automatically builds modules, when a kernel gets upgraded.
>
> Regards,
> Ralf
>
>
>
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