Intel Skylake HD520 Screen flickering
Submitted by Dominik Klementowski
Assigned to Intel GFX Bugs mailing list
Link to original bug (#109953)
Description
Created attachment 143620
dmesg output on booted Arch with 5.0.0-rc7-drm-intel-next-git-b4bf44d2dcbd and enabled debug flag
== Machine details ==
Host: Aspire E5-574 V1.14
CPU: Intel i5-6200U (4) @ 2.700GHz
GPU: Intel Skylake GT2 [HD Graphics 520]
Memory: 15904MiB (2 * 8GB)
Resolution: 1920x1080
== Issue description ==
This problem was already solved for me once. When I bought this laptop I immediately changed its hardware configuration. As far as I remember, that problem was introduced when I extended RAM memory from 1x4GB to 2x8GB. Any Linux OS with any kernel version (that supported Skylake graphics at all) had that issue. System starts normally and image rendering is totally fine, but sometimes I can see that some part of the screen is black for a small fraction of a second. Sometimes I can see some little scratches and distortions too.
Back then I commented on existing, related bug https://bugs.freedesktop.org/show_bug.cgi?id=94605#c87 I posted some dmesg outputs and then Paulo Zanoni posted kernel patches I tested and first patch was enough for me to not experiencing this issue anymore.
For now I modified my hardware configuration again by replacing harddrive (from 256G SSD to 512GB SSD). Unfortunately now the problem is back. I already checked Windows and it works just fine without any flickering nor any distortions at all. I don't know why it happens, maybe new harddrive consumes more power or something.
Anyway there was also something that Paulo Zanoni suggested - sometimes first row of pixels is broken while playing video. Back when we exchanged comments I wasn't able to reproduce this issue, but on regular basis I started to notice green line on top of the screen showin ocasionally when playing fullscreen video.
== Steps to reproduce ==
Simply run any graphical environment with i915 and sooner or later I can experience some broken frames. It feels like it happens the more often, the more GPU resources are used - e.g. playing YouTube video and running Virtual Machine with other OS makes it happening pretty often.
I doesn't seem like X.org related problem, because I can easily reproduce it on the Wayland session.
== Logs ==
When this happens, this appears in dmesg output:
[ 2609.752028] [drm:intel_hpd_irq_handler [i915]] HPD interrupt storm detected on PIN 6
[ 2609.752539] [drm] HPD interrupt storm detected on connector DP-1: switching from hotplug detection to polling
The dmesg.txt attachment has full dmesg output. I added kernel parameters drm.debug=0xe and log_buf_len=4M so maybe those logs would be any useful.
== Environments ==
I tried with few different kernel versions and distros and it's the same everywhere:
Arch Linux: Linux 5.0
Arch Linux: Linux 5.0-rc7 (linux-drm-intel-next)
KDE Neon (Ubuntu?): Linux ~4.16
Debian Stable: Linux 4.8
== Summary ==
Since this is not any blocking sort of bug, it is really annoying and breaks the overall experience.
I would be very grateful for help / fixes. From my side, if I only have some time, I can make any tests, compile kernels, provide logs and so on.
Attachment 143620, "dmesg output on booted Arch with 5.0.0-rc7-drm-intel-next-git-b4bf44d2dcbd and enabled debug flag":
dmesg.txt