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Re: on-screen artifacts (red pixels) at high resolution with Intel HD 630 (Kaby Lake)

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On 07.12.2017 16:33, Alexandre Rossi wrote:
> (please CC me as I am not subscribed to the list)
>
> Hi,
>
> I am experiencing on-screen artifacts (red dots) when running at
> 1920x1080 on HDMI out. I've ruled out a hardware (cable, TV or GPU)
> issue by installing win10 which does not show those problems.
>
> This is by using stretch, issue occurs with both kernel 4.9 or 4.13
> available in the backports. The hardware is intel HD 630 (Kaby Lake).
> Xorg uses the modeset driver.
>
> I was wondering where to get help regarding whether this is a bug :
> - xorg?
> - kernel i915?
> - kernel drm?
> - other component?
>
> Thanks,
>
> Alex
>
A screenshot would be helpful. Does these artifacts appear every single
time or sporadically?

I'd suggest to check RAM first of all with `memtest86+` and let it run
overnight. Not sure if test will get into memory area used as video
memory though.

There was a microcode bug discovered recently in Kabylake-Skylake CPUs.
It causes memory corruption if I remember it correctly. It could be
fixed for certain CPUs by updating firmware for your motherboard or
installing "intel-microcode" package. It could be the cause for your issue.


-- 
With kindest regards, Alexander.

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on-screen artifacts (red pixels) at high resolution with Intel HD 630  (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-07 12:40 +0100
  Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) "Alexander V. Makartsev" <avbetev@gmail.com> - 2017-12-07 13:30 +0100
    Re: on-screen artifacts (red pixels) at high resolution with Intel  HD 630 (Kaby Lake) Shin Ice <shin.ice@shinice.net> - 2017-12-07 14:20 +0100
    Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-08 13:40 +0100
      Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) "Alexander V. Makartsev" <avbetev@gmail.com> - 2017-12-08 16:00 +0100
        Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-09 15:40 +0100
          Re: on-screen artifacts (red pixels) at high resolution with Intel  HD 630 (Kaby Lake) David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 16:20 +0100
  Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Benny Simonsen <benny@slbs.dk> - 2017-12-09 17:00 +0100
    Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-10 11:20 +0100
  Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Jörg-Volker Peetz <jvpeetz@web.de> - 2017-12-10 12:30 +0100
    Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-11 10:10 +0100
      Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Jörg-Volker Peetz <jvpeetz@web.de> - 2017-12-11 12:20 +0100
        Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-14 23:00 +0100
          Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Ben Caradoc-Davies <ben@transient.nz> - 2017-12-14 23:50 +0100
            Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-19 08:30 +0100
          Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Felix Miata <mrmazda@earthlink.net> - 2017-12-15 00:30 +0100
            Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Alexandre Rossi <alexandre.rossi@gmail.com> - 2017-12-21 23:10 +0100
              Re: on-screen artifacts (red pixels) at high resolution with Intel HD  630 (Kaby Lake) Felix Miata <mrmazda@earthlink.net> - 2017-12-22 00:10 +0100

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