[Intel-gfx] Display problems after upgrade to X v1.18.3

[David Weinehall]

On Tue, Aug 23, 2016 at 11:40:53AM -0400, 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 14.04.4 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.

Core i5 is a bit vague; to know what graphics generation you run,
could you provide the output of:

sudo cat /sys/kernel/debug/dri/0/i915_capabilities

Also, since it might be a kernel issue, the kernel version would be
nice to know too (uname -a).

> 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 amouts 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.


Kind regards, David Weinehall