** Also affects: xorg-server (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: nvidia-graphics-drivers (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu Kinetic)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/2009767
Title:
external HDMI monitor is laggy on NV reverse PRIME system
Status in OEM Priority Project:
New
Status in nvidia-graphics-drivers package in Ubuntu:
Confirmed
Status in xorg-server package in Ubuntu:
Fix Released
Status in xorg-server source package in Jammy:
Confirmed
Status in nvidia-graphics-drivers source package in Kinetic:
New
Status in xorg-server source package in Kinetic:
Fix Released
Bug description:
[Summary]
When the graphic mode is on-demand mode and plug in the monitor to HDMI port,
there are two issue occures:
1. External monitor's screen is very laggy in external monitor mode only.
2. External monitor's screen sometimes (~50%) will be blak in join display
mode.
[Steps to reproduce]
1. Boot in OS
2. Plug in the external monitor in HDMI port
3. Find the cursor moving in external monitor is laggy
[Additional information]
Feedback from NV:
An NVIDIA driver built with the features needed to get rid of the laggy
monitor problem causes Xorg 1.21.1.3 to crash. There's a patch for Xorg to fix
the crash (https://gitlab.freedesktop.org/xorg/xserver/-/issues/1275) and it
was first included in the 1.21.1.4 release.
Since the older X servers crash, NVIDIA deliberately does a version check in
the driver and enables these features for Xorg servers that are known to work,
i.e. 1.21.1.4 or higher.
This unfortunately prevents backporting the fix to 1.21.1.3.
Engineering has chosen this approach since a crash is worse than the
low FPS lag and the user might lose work merely by plugging/unplugging
displays. If it was about a performance degradation, slight
corruption, or something non-fatal, we wouldn't need to check Xorg
version
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