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Video/Audio in slow-mo after update? Ubuntu 15.10

17 posts / 0 new
Ravenel's picture

Feb 21, 2016 - 11:45am

  • Hi all,


    I've been using these graphics drivers in Ubuntu 15.10 on an Intel NUC for a couple of months now with no issues. On Friday evening, I ran a regular apt-get update/upgrade, which installed the new version of the graphics installer.


    Since then, all video and audio (video files on local machine, youtube, etc) has been playing in what seems to be slow motion--pitch is very low, and video seems to be slow. This doesn't seem to be a performance type slowdown with jerky video.


    I'm not 100% sure this is related to the new video drivers, but seems like a logical place to start.


    Has anyone seen anything similar? Any ideas on where to start to debug this? Appreciate any help.


    Feb 21, 2016 - 11:45am
  • So, as an update to this--definitely seems to be something related to the new drivers. I uninstalled them using an adaptation of the instructions as the below link (basically, told apt to treat the Ubuntu distro packages as higher priority than the Intel packages, which causes it to downgrade all of the Intel installed packages back to the Ubuntu versions), and this fixed the issue.


    Not sure if anyone else is seeing anything similar or if this was just some weird quirk of my system, but wanted folks to be aware of it.


    Uninstall instructions:

    Feb 21, 2016 - 12:00pm
  • Hi - thanks for the info - it sounds like a regression - I haven't seen this on any of the kit I have to test with but I don't have a NUC here - would you mind telling me the exact model you have? The lspci -kvnn output (at least for the video device) could be very helpful in tracking this down.

    Feb 22, 2016 - 04:55pm
  • Sure--it is an NUC5i3RYH. LSPCI output is at (cannot paste here--is apparently being blocked by the spam filters).

    Feb 23, 2016 - 06:32am
  • Those filters can be a pain. Thanks, passing the info on, let's see what comes back.

    Feb 23, 2016 - 09:04am
  • Bug filed:

    Mar 01, 2016 - 09:35am
  • Looks like the bug won't be looked at unless it happens with a vanilla kernel (no backport). Any chance you could try a 4.3 kernel on the nuc in question?

    Mar 02, 2016 - 08:43am
  • I'm experiencing the same problem with my audio playing in 'slow motion' when connecting to an external monitor via hdmi after upgrading the intel graphics drivers last week (on Ubuntu 15.10). Although i havent experienced the video problems like the original poster, connecting via hdmi has become very difficult since the driver upgrade with my laptop refusing to connect and struggling to cope with the resolution differences between the two monitors. These issues weren't present before the upgrade and there isnt an issue with any hardware as the hdmi works when running windows 10. I'm not entirely sure what to do, is there an easy way to revert the upgrade? Or, should i wait for perhaps an upcoming update (if there's going to be one)?

    Mar 10, 2016 - 05:28am
  • If it's the update to the kernel module then removing the i915-4.3.3-4.2.0-dkms package and rebooting should do the trick.
    while we're here, could you tell me the PCI info for your GPU? lspci -kvnn should tell you, it's the section which says "Kernel driver in use: i915" I'm interested in.

    Mar 10, 2016 - 06:46am
  • Ok thanks, i'll give that a try. I'm using the integrated gpu within my core i7 (Intel Corporation Broadwell-U Integrated Graphics [8086:1616]), is that the information you need?

    Mar 10, 2016 - 08:11am
  • Yes, thanks. As you can imagine there's a very wide range of hardware supported by this driver going back more than 10 years and unfortunately it isn't possible to test on all of them so sometimes regressions creep in.

    Mar 10, 2016 - 09:39am