HDMI shudder issue

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1

I am using two monitors. The main one is a Sharp TV, connected via hdmi. The other monitor is a Lenovo that connects vga. They are connected to a Intel Integrated 630 video card.

The hdmi monitor frequently starts to “jump” or shudder. Occasionally it jumps once or twice but most often when it starts to shudder is gets faster and the screen is unusable. I switched from X11 to Wayland and that helped a bit.

What I discovered by accident is that shuddering stops if I run a video. I can go to Youtube and run a random video or run a stored video on vlc. A reboot will bring the shudder back but not immediately . The video does not have to run continuously. I merely have to run it and the shudder stops as soon as the video starts.

Since this happens only on the hdmi connection to the TV and not to the monitor, I assume I have to correct some hdmi setting. Any help is gratefully received.

2

Give Arch Wiki a look. I have two 630s, including that I type this from:

# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 630 (rev 04)
# cat /proc/cmdline
root=LABEL=...i915.enable_guc=2...
#

You may want to try GUC and/or HUC. I’ve been using GUC too long to remember why. Could be it was one of @malcolmlewis’ suggestions. :wink: If neither help you, you may want to give other i915 options there a try.

3

I have three Dell systems with the “Intel CometLake-S GT2 [UHD Graphics 630]” I expect setting guc=2 will help, you need to install the intel-gpu-tools and run intel_gpu_top. If you want to run as your user, then, as root you need to run setcap cap_perfmon=ep $(which intel_gpu_top)

Also check what intel packages are installed as well, eg intel-media-driver intel-vaapi-driver

4

I reviewed the Arch wiki. I have all the files listed here. I ran intel_gpu_top but I don’t know what I’m looking at. I see listings of my open app, like chrome. I need to be told what commands to run. Don’t know if I should run as root or user or how to set that up. I’m the only one touching this computer, so does it matter?

I keep running a short video in vlc when the shudder appears and that stops it, at least temporarily.

5

@Prexy so do you see render/3d and video engines in use?

6

I have vlc open. When I run intel-gpu-top, I see vlc is running and there is also xwaylandvideobr. There is nothing else video oriented. The columns labeled render/3d and video are almost empty. As I type this, the summary says Render/3D is between .05-1.5% busy.

Starting a video makes Render/3D jump to 4-5% and a reading shows up for Video. That reading is over 10%.

7

Is a motherboard firmware (BIOS) update available?

8

@Prexy so that indicates hardware decoding is working…

9

I can’t get to the bios. A restart jumps immediately to grub. I’ve tried esc and F12 and neither interrupts the boot process. As an aside, the running video trick is getting less effective after a recent zypper dup.

10

I have to figure out what the previous suggestions need to activate. The arch wiki is way past my skill level.

11

BBS menu hotkey depends on who made the motherboard:

  • Abit F9
  • Acer F12 or ESC or F9
  • ASRock F11
  • Asus F8
  • Biostar F9
  • Dell F12
  • DFI ESC
  • eCS F12 or F10
  • eMachines F10
  • EVGA F7
  • Fujitsu ?
  • Gateway F12 or F10
  • Gigabyte F12
  • HP/Compaq F10, F9 or ESC or ESC,F9
  • Intel F10
  • Lenovo F12 or F8 or F10
  • MSI F11
  • Shuttle ESC or F11 or F7
  • Toshiba F12

When I paste the above in other forums as “list”, the tabs following the names output as tabs, not collapsed to single spaces as here. :frowning:

12

Using @mrmazda list, I got to the bios. No update available. I’ll see if I can figure out the other suggestions.

13

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