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

[Jim Abernathy]

On 08/23/2016 01:10 PM, David Weinehall wrote:
> 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
gen: 6
pch: 2
is_mobile: yes
is_i85x: no
is_i915g: no
is_i945gm: no
is_g33: no
need_gfx_hws: yes
is_g4x: no
is_pineview: no
is_broadwater: no
is_crestline: no
is_ivybridge: no
is_valleyview: no
is_haswell: no
is_skylake: no
is_preliminary: no
has_fbc: yes
has_pipe_cxsr: no
has_hotplug: yes
cursor_needs_physical: no
has_overlay: no
overlay_needs_physical: no
supports_tv: no
has_llc: yes
has_ddi: no
has_fpga_dbg: no
jim at test:~$

> Also, since it might be a kernel issue, the kernel version would be
> nice to know too (uname -a).
>
Linux test 4.4.0-34-generic #53-Ubuntu SMP Wed Jul 27 16:06:39 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

Intel Desktop DCP847SKE NUC with Intel Celeron CPU 847 @ 1.10GHZ

>> 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