Unable to Fix Screen Tearing in 4.1 / XFCE 4.14

[SenorFusion]

Qubes OS release

4.1 current

Brief summary

Extreme screen tearing during video playback

Steps to reproduce

Open Firefox or Chromium
Play a youtube video

Expected behavior

video plays without tearing

System

Lenovo Thinkpad P70 Skylake
Nvidia M3000 Quadro
noveau
xen 4.14.5
kernel 5.10.112

What I have Tried

All of the suggestions in #4208 #3194 #4943 #5092 #5244
None of these work and all of the issues are nearly 3 years old at this point and none are about Qubes 4.1

The suggestions mostly boil down to 2 things:

Window Tweak Settings > Compositor> Synchronize drawing on the vertical blank.

This is no longer available in Xfce 4.14 so cannot be done that I can find.

I also tried disabling the compositor completely under WIndows Tweaks, that did not help either.

Add items to a xorg config file as listed in the GUI Configuration Doc

Section "Device"
		Identifier "Intel Graphics"
		Driver "intel"
		Option "TearFree" "true"
EndSection

I've tried multiple other variations on this file with i915, vsync, and triplebuffer.

After every attempt at adding this file qubes GUI does not boot and I have to log in from the terminal and rm the file.

It hangs on the screen that shows all boot checks (which do not normally show during boot) and then stops at Starting Hold until boot process finishes up.... but it never finishes

Attached is a picture of the boot hang, and a copy of Xorg log

Xorg.0.log

[marmarek]

You have two graphics cards, try adding BusID "PCI:0@0:2:0" to the Device section to be specific which one to use. Otherwise, connecting intel driver to Nvidia card indeed may result in Xorg not starting at all.

[SenorFusion]

Thank you for the help! I tried the following in /etc/X11/xorg.conf.d/90-intel.conf

Section "Device"
		Identifier "Intel Graphics"
                BusID "PCI:0@0:2:0"
		Driver "intel"
		Option "TearFree" "true"
EndSection

It didn't work but it failed at a slightly different place in the boot process:

Xorg.0.log

[marmarek]

Are you sure this log if from the time you tried with /etc/X11/xorg.conf.d/90-intel.conf ? I don't see any mention of using "intel" driver there, but only "modeset" one.

[SenorFusion]

Are you sure this log if from the time you tried with /etc/X11/xorg.conf.d/90-intel.conf ? I don't see any mention of using "intel" driver there, but only "modeset" one.

I am sure it is the most recent copy of that log. But does Xorg log even get generated if X11 never starts?

After your first post I:

-Created the new 90-intel.conf file
-Restart
-Hangs at boot as seen in picture on my last post
-login via console
cd /etc/X11/xorg.conf.d
sudo rm 90-intel.conf
sudo reboot now
-Login normally
-Go to Dom0 Terminal and qvm-copy xorg log to this VM and post it for you

[SenorFusion]

boot.log

Here is the boot log from yesterday when I was trying this if that is helpful

[marmarek]

In that case, copy somewhere Xorg.0.log (just to avoid overriding it by subsequent Xorg start) before removing 90-intel.conf.
You can also take a look at Xorg.0.log.old, maybe it's still there.

[SenorFusion]

Some improvement! For whatever reason I was able to boot this time. Maybe I had a typo before.

Section "Device"
		Identifier "Intel Graphics"
                BusID "PCI:0@0:2:0"
		Driver "intel"
		Option "TearFree" "true"
EndSection

Positive: The tearing is not happening anymore, at least on the laptop screen.

Negative: System is not recognizing any external displays. xrandr shows in eDP1 (built in display) Nothing else, even though 2 external displays are still plugged in exactly as before I rebooted - 1 DP, 1 HDMI.

hybrid systems are such a pain!

Here is the xorg log from this current boot (laptop screen only). I looked at xor.log.old but it was last edited over a month ago so I dont think it will have anything useful.

Xorg.0.log