Could be a power state issue. I just recently added intel_pstate=skylake_hwp to my grub while working on my own build. If it is a similar issue, perhaps the instructions on this page will help.

IIRC I added this to F27 but not yet to F28, just to make sure I didn't break anything. My video stuttering issue is really with F28.

https://blogs.igalia.com/vjaquez/2017/12/07/enabling-huc-for-sklkbl-in-debiantesting/

On Thu, Sep 13, 2018 at 8:16 AM Stephen via talk <talk@gtalug.org> wrote:
And help and/or advise appreciated.

I am using 18.4 and apply all updates.

I have been using ffmpeg for many years to convert file formats. I am
now getting errors that have me confused. Here is the command line:

ffmpeg -i 101.Cat.avi -c:v libx264 -c:a copy 101.Cat.mp4

I now get many errors:

libGL error: unable to load driver: i965_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: i965
libGL error: unable to load driver: i965_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: i965
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
X Error: GLXBadContext
Request Major code 155 (GLX)
Request Minor code 6 ()
Error Serial #55
Current Serial #54

I Google the errors and everything seems to focus on bugs in Android
Studio which I don't use.

So I am at a loss for how to fix this.


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Stephen
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Russell