Arch Linux

Xwang

Member

From: EU

Registered: 2012-05-14

Posts: 414

Prime issue betwwen Nvidia and Intel

Hi,
I've an asus n752vx with Nvidia 950m.
I've added the nvidia-drm.modeset=1 option to the kernel line which is:

BOOT_IMAGE=/vmlinuz-linux root=UUID=74296c4e-84df-4eda-87a1-09be9d8e114b rw quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 splash mitigations=auto,nosmt pci=noaer nvidia-drm.modeset=1

but it seems that the syncronization is not active for the screen in use (the laptop one) and I see a lot of tearing watching videos:

xrandr --prop
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 382mm x 215mm
        EDID: 
                00ffffffffffff0030e4e80400000000
                00190104952615780a0bb5a35955a027
                0c505400000001010101010101010101
                0101010101012e3680a070381f403020
                35007ed71000001a0000000000000000
                00000000000000000000000000fe004c
                4720446973706c61790a2020000000fe
                004c503137335746342d53504633004f
        PRIME Synchronization: 0 
                supported: 0, 1

This is the output of dmesg |grep drm:

[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=74296c4e-84df-4eda-87a1-09be9d8e114b rw quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 splash mitigations=auto,nosmt pci=noaer nvidia-drm.modeset=1
[    0.139358] Kernel command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=74296c4e-84df-4eda-87a1-09be9d8e114b rw quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 splash mitigations=auto,nosmt pci=noaer nvidia-drm.modeset=1
[    1.348443] fb0: switching to inteldrmfb from EFI VGA
[    1.349484] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.349484] [drm] Driver supports precise vblank timestamp query.
[    1.350483] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_27.bin (v1.27)
[    1.361714] [drm] Initialized i915 1.6.0 20190822 for 0000:00:02.0 on minor 0
[    1.375223] fbcon: i915drmfb (fb0) is primary device
[    1.375226] i915 0000:00:02.0: fb0: i915drmfb frame buffer device
[    1.530462] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
[    1.935323] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.935324] [drm] No driver support for vblank timestamp query.
[    1.935326] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:01:00.0 on minor 1

When I activated PRIME syncronization a lot of months ago (as soon as it was available), it worked.
Can you please help me?
Is it a bug?

zaxmyth

Member

From: Seattle / San Francisco

Registered: 2019-03-25

Posts: 25

Website

Re: Prime issue betwwen Nvidia and Intel

Are you running kernel 5.4? Looks like synchronization is broken without a patch: https://bbs.archlinux.org/viewtopic.php?id=251032

Xwang

Member

From: EU

Registered: 2012-05-14

Posts: 414

Re: Prime issue betwwen Nvidia and Intel

Yes, I'm am.
Switching to LTS has solved the issue.
If nobody has opened a bug, I'll open it.
Thanks.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,237

Re: Prime issue betwwen Nvidia and Intel

As established it is known a patch is available and nvidia fixed it already in the vulkan branch, so please don't open a bug it will be fixed in the next stable nvidia release.

Xwang

Member

From: EU

Registered: 2012-05-14

Posts: 414

Re: Prime issue betwwen Nvidia and Intel

As established it is known a patch is available and nvidia fixed it already in the vulkan branch, so please don't open a bug it will be fixed in the next stable nvidia release.

OK