Public bug reported:
Steps to reproduce:
1. Boot up the device, then plug in HDMI/VGA port
2. Check "Mirror displays" in Display of System Settings
3. Set the screen to lower resolution (e.g. 800x600) and apply change
4. Toggling Fn+F4 for a cycle, can't switch to extended mode
Expected Result:
Display modes should be "Mirror mode" -> "Extended mode" -> "Internal only
mode" -> "External only mode"
Actual Result:
Display modes are "Mirror mode" -> "Mirror mode" -> "Internal only mode" ->
"External only mode"
Note:
If unchecked "Mirror displays" and apply again, g-s-d can get the Xinerama
configuration.
Some error messages while running g-s-d in debug mode:
(gnome-settings-daemon:4025): GnomeDesktop-CRITICAL **:
gnome_rr_output_info_get_geometry: assertion `GNOME_IS_RR_OUTPUT_INFO
(self)' failed
(gnome-settings-daemon:4025): GnomeDesktop-CRITICAL **:
gnome_rr_output_info_get_geometry: assertion `GNOME_IS_RR_OUTPUT_INFO
(self)' failed
(gnome-settings-daemon:4025): GnomeDesktop-CRITICAL **:
gnome_rr_config_set_clone: assertion `GNOME_IS_RR_CONFIG (self)' failed
=== xinerama setup Configuration ===
none
Since the gnome_rr_output_info_get_geometry() failed in
compare_output_position(),
trim_rightmost_outputs_that_dont_fit_in_framebuffer() will remove the Xinerama
configuration in make_xinerama_setup().
** Affects: oem-priority
Importance: Medium
Status: New
** Affects: oem-priority/precise
Importance: Undecided
Status: New
** Affects: gnome-settings-daemon (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "gsd.log"
https://bugs.launchpad.net/bugs/1208333/+attachment/3760954/+files/gsd.log
** Also affects: oem-priority
Importance: Undecided
Status: New
** Also affects: oem-priority/precise
Importance: Undecided
Status: New
** Changed in: oem-priority
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1208333
Title:
Change resolution with "Mirror displays" checked, extended mode will
be trimmed
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