The bug also affects my PC since yesterday. Ubuntu 20.04 Xorg, 2 screens
(HDMI and a DVI connector) connected running on a propetary NVidia
driver.

$ sudo journalctl -S "2020-11-29 07:30:00" --no-pager -f | grep -i ERR

Nov 29 07:59:17 Hostname gsd-power[3039]: Error setting property 
'PowerSaveMode' on interface org.gnome.Mutter.DisplayConfig: Timeout was 
reached (g-io-error-quark, 24)
Nov 29 07:59:17 Hostname Flameshot.desktop[3123]: QDBusTrayIcon encountered a 
D-Bus error: QDBusError("org.freedesktop.DBus.Error.NoReply", "Did not receive 
a reply. Possible causes include: the remote application did not send a reply, 
the message bus security policy blocked the reply, the reply timeout expired, 
or the network connection was broken.")
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.535333:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: 
Framebuffer is incomplete.
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.535431:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: 
Framebuffer is incomplete.
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.535513:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: Draw 
framebuffer is incomplete
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.537230:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: 
Framebuffer is incomplete.
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.538480:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: 
Framebuffer is incomplete.
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.538539:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: 
Framebuffer is incomplete.
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.538601:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: Draw 
framebuffer is incomplete
Nov 29 07:59:23 Hostname gnome-shell[8041]: 
[8116:8116:1129/075923.539957:ERROR:gl_utils.cc(314)] 
[.RendererMainThread-0x1fc6ea5ee700] GL_INVALID_FRAMEBUFFER_OPERATION: 
Framebuffer is incomplete.
Nov 29 07:59:27 Hostname gnome-shell[8041]: 
[8116:8116:1129/075927.478266:ERROR:shared_context_state.cc(785)] 
SharedContextState context lost via ARB/EXT_robustness. Reset status = 
GL_UNKNOWN_CONTEXT_RESET_KHR
Nov 29 07:59:27 Hostname gnome-shell[8041]: 
[8116:8116:1129/075927.479271:ERROR:gpu_service_impl.cc(1127)] Exiting GPU 
process because some drivers can't recover from errors. GPU process will 
restart shortly.
Nov 29 07:59:27 Hostname gnome-shell[8041]: 
[1599635:1599635:1129/075927.614514:ERROR:vaapi_wrapper.cc(541)] vaInitialize 
failed: unknown libva error
Nov 29 07:59:32 Hostname gsd-power[3039]: Error setting property 
'PowerSaveMode' on interface org.gnome.Mutter.DisplayConfig: Timeout was 
reached (g-io-error-quark, 24)
Nov 29 07:59:42 Hostname com.teamviewer.TeamViewer[2843]: 
qrc:/ui/MainWindow/Partnerlist/ItemDetailView.qml:12: TypeError: Type error
Nov 29 07:59:42 Hostname com.teamviewer.TeamViewer[2843]: 
qrc:/ui/MainWindow/Partnerlist/ItemDetails.qml:23: TypeError: Type error
Nov 29 07:59:42 Hostname com.teamviewer.TeamViewer[2843]: 
qrc:/ui/MainWindow/Partnerlist/ItemDetails.qml:24: TypeError: Type error
Nov 29 07:59:50 Hostname gjs[3344]: JS ERROR: Gio.TlsError: Error performing 
TLS handshake: A disallowed SNI server name has been received.
Nov 29 07:59:51 Hostname gsd-power[3039]: Error setting property 
'PowerSaveMode' on interface org.gnome.Mutter.DisplayConfig: Timeout was 
reached (g-io-error-quark, 24)
Nov 29 07:59:53 Hostname gjs[3344]: JS ERROR: Gio.TlsError: Error performing 
TLS handshake: A disallowed SNI server name has been received.

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https://bugs.launchpad.net/bugs/1880954

Title:
  Ubuntu 20.04 freezes when logging in with external monitors connected
  [Error setting property 'PowerSaveMode' on interface
  org.gnome.Mutter.DisplayConfig: Timeout was reached (g-io-error-quark,
  24)]

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