display/GFX issue with Ubuntu 16.04 not seen in 14.04

Jim Abernathy jfabernathy at outlook.com
Wed Aug 24 11:05:58 UTC 2016

On 08/23/2016 10:33 AM, Christopher Barry wrote:
> On Tue, 23 Aug 2016 06:53:13 -0400
> Jim Abernathy <jfabernathy at outlook.com> wrote:
>> On 08/19/2016 10:17 AM, Jim Abernathy wrote:
>>> Not having much luck with the Distro forums on this issue so I
>>> thought I'd ask for advice here.
>>> I've been running Ubuntu 14.04.5 for some time on Intel Core i5 GFX
>>> without any issues.  My display is HDMI from the PC to an Onkyo A/V
>>> receiver then to a Sony KDL-XBR6.
>>> When I try a fresh install of 16.04.1, I get a display that blanks
>>> out for 3-5 seconds at random times depending on what is being
>>> displayed at the time.  I also have small abouts of video noise that
>>> is random horizontal lines about 1 pixel tall scattered through the
>>> page.
>>> I noticed that 14.04.05 uses X server 1.17.2 and 16.04.1 uses 1.18.3.
>>> When I do the command xrandr --verbose I see some small differences
>>> between 14.04 and 16.04, but it's things like 2 digits displayed
>>> instead of 1.  i.e. 60.0 vs. 60.00. I'm only concerned with 1080P HD.
>>> I've tried this on different computers all with Intel GFX. same
>>> results.
>>> This does not occur on other monitors or TVs.
>>> I'd blame it on Sony and Onkyo if they didn't work so well with
>>> Windows, all versions, and ubuntu all versions except 16.04.
>>> It's almost like the auto detection software in the newest version
>>> of X is off just enough to make my display flaky.  Kind of like the
>>> old analog CRT TVs that were sensitive to small tweaks to the
>>> horizontal and vertical adjustments.
>>> Any help would be appreciated.
>>> Jim A
>> Can someone let me know where I can ask questions regarding problems
>> with X??  I thought this forum would be the place?
>> Jim A
> Jim,
>  From the data above, I do not think it's possible to troubleshoot very
> effectively. It also seems like (to me anyway) that you have a fairly
> non-standard kind of configuration going on.
> If I understand it, you have a media-center type PC with an integrated
> Intel graphics card on an core i5 processor. Using an HDMI cable, you're
> plugging into an Onkyo A/V receiver (you do not mention the model),
> which in turn connects to a Sony KDL-XBR6 LCD TV.
> What happens when you connect your PC to a the Sony directly or to
> a normal PC LCD monitor? Does that work?
At first I thought I found a solution when I connected directly to the 
Sony, but since the occurrence is random it's hard to tell. at first it 
wasn't occurring when directly on the Sony, but then it started just as 
bad.  I don't see this on any other monitor or TV, or O/S. On Ubuntu as 
long as I stay with 14.04.4 I'm fine.  If I move to 14.04.5 it changes 
kernels and xorg and I see the problems start.

On 16.04.1 with a clean install, the blackouts last so long it's hard to 
get work with the GUI long enough to get it installed. After I did an 
update to the most current changes, the blackouts were much less 
frequent, only 3-4 per minute and they only lasted 3-5 seconds.

> Are you using an xorg configuration file, or are you allowing automatic
> setup via kernel mode switching? If you a have config file(s), what
> happens when you move them out of the way temporarily and allow
> automatic config?
> What's in your /var/log/Xorg.0.log?
> People here help quite readily if they have data to act upon.
> --
> Regards,
> Christopher Barry
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