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. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org ⠈⠳⣄⠀⠀⠀⠀
