This bug was fixed in the package mutter - 3.36.9-0ubuntu0.20.04.1
---------------
mutter (3.36.9-0ubuntu0.20.04.1) focal; urgency=medium
* New upstream release (LP: #1919143)
- Do not ping unmanaging windows
- Improve freezes when switching workspace
- Fix drag cancel animation when using geometry scaling
- Fix stuck icon in DND operation between X11 and wayland
- Fix restoring focus to windows using globally active input
- Fix _NET_WM_FRAME_DRAWN timestamps
- Fix unwanted position changes on window resize
- Fix device configuration not being picked up on X11
- Fix size hints with CSD
- Disable CRTCs if there is no monitor (LP: #1905825)
- Fixed crashes
- Plugged memory leaks
-- Marco Trevisan (Treviño) <ma...@ubuntu.com> Wed, 31 Mar 2021
02:15:27 +0200
** Changed in: mutter (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1905825
Title:
[SRU] Disable CRTCs when system becomes headless
Status in HWE Next:
New
Status in OEM Priority Project:
New
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Focal:
Fix Released
Status in mutter source package in Groovy:
Fix Committed
Status in mutter source package in Hirsute:
Fix Released
Bug description:
[Impact]
On new Intel SoCs, after all connectors are unplugged and the system becomes
headless, it cannot detect monitor hotplug event from type-c port.
[Fix]
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1561
Based on "drm/i915 Intel GFX Driver, Hotplug" [1]:
"Finally, the userspace is responsible for triggering a modeset upon
receiving the hotplug uevent, disabling or enabling the crtc as needed."
[Test]
Unplug type-c monitor from an Intel Tiger Lake desktop. Replug the monitor
back, monitor is blank.
With the fix applied, the system can detect monitor again.
[Where problems could occur]
This fix disables CRTCs when there's no monitor, if driver has trouble
dealing with it, we may see something break.
To manage notifications about this bug go to:
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