Checking in 17.10 PRIME Synchronization can be enabled & works in
UbuntuGnome but doesn't in Ubuntu. Main reason is in UbuntuGnome
nvidia_drm.modeset can be enabled, in Ubuntu it can't.
ex.'s
UbuntuGnome, gdm3
$ sudo cat /sys/module/nvidia_drm/parameters/modeset
[sudo] password for doug:
Y
$ xrandr --verbose
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
eDP-1-1 connected primary 1920x1080+0+0 (0x46) normal (normal left inverted
right x axis y axis) 345mm x 194mm
Identifier: 0x42
Timestamp: 21140
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
_MUTTER_PRESENTATION_OUTPUT: 0
EDID:
00ffffffffffff0030e4d90200000000
00150103802313780a15d59e59509826
0e505400000001010101010101010101
0101010101017e3680b070381f403020
350059c2100000190000000000000000
00000000000000000000000000fe004c
4720446973706c61790a2020000000fe
004c503135365746312d544c4232004b
PRIME Synchronization: 1
supported: 0, 1
Same machine in Ubuntu
sudo cat /sys/module/nvidia_drm/parameters/modeset
[sudo] password for doug:
N
$ xrandr --verbose
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
eDP-1-1 connected primary 1920x1080+0+0 (0x46) normal (normal left inverted
right x axis y axis) 345mm x 194mm
Identifier: 0x42
Timestamp: 12578
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0030e4d90200000000
00150103802313780a15d59e59509826
0e505400000001010101010101010101
0101010101017e3680b070381f403020
350059c2100000190000000000000000
00000000000000000000000000fe004c
4720446973706c61790a2020000000fe
004c503135365746312d544c4232004b
PRIME Synchronization: 0
supported: 0, 1
So until shown otherwise am adding lightdm
** Summary changed:
- PRIME synchronization not working with xserver-1.19.x
+ PRIME synchronization not working with xserver-1.19.x in Ubuntu
** Also affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1674304
Title:
PRIME synchronization not working with xserver-1.19.x in Ubuntu
Status in lightdm package in Ubuntu:
New
Status in nvidia-prime package in Ubuntu:
Confirmed
Bug description:
xserver-1.19.x is being proposed for 17.04, currently available in test ppa
https://launchpad.net/~canonical-x/+archive/ubuntu/x-staging
FFe - https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1671799
On 2 separate Optimus laptops there is no sign of it actually working,
tearing while using nvidia drivers (375.x) is rampart.
Testing with both current 4.10.0-13 & previous 4.9.0-11 kernels.
Shows this in kern.log so support is enabled
Mar 19 08:18:47 doug-Lenovo-IdeaPad-Y510P kernel: [ 1.746443] [drm]
Supports vblank timestamp caching Rev 2 (21.10.2013).
Mar 19 08:18:47 doug-Lenovo-IdeaPad-Y510P kernel: [ 1.746444] [drm] Driver
supports precise vblank timestamp
But in Xorg.0.log -
randr: falling back to unsynchronized pixmap sharing
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: nvidia-prime 0.8.4
ProcVersionSignature: Ubuntu 4.10.0-13.15-generic 4.10.1
Uname: Linux 4.10.0-13-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Mon Mar 20 07:53:12 2017
InstallationDate: Installed on 2017-03-15 (4 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 (20170311)
SourcePackage: nvidia-prime
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1674304/+subscriptions
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