Bug#1110959: Fine with nouveau instead of nvidia-driver
Upon uninstalling nvidia-driver, switching to nouveau, and manually turning off the phantom VGA screen in `gnome-control-center display again`, the bug disappeared. I had no more phantom virtual space to the right of the main screen. Some debugging:
$ xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x45 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 4 outputs: 3 associated providers: 1 name:modesetting
Provider 1: id: 0xe1 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
$ xrandr --listmonitors
Monitors: 1
0: +*DVI-D-1 1920/531x1080/298+0+0 DVI-D-1
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DVI-D-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 298mm
1920x1080 60.00*+ 59.96 59.93
1680x1050 59.95 59.88
1400x1050 74.76 59.98
1600x900 59.95 60.00 59.82
1280x1024 75.02 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00
1280x720 60.00 59.99 59.86 60.00 59.74
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
700x525 74.76 59.98
800x450 59.95 59.82
640x512 75.02 60.02
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
640x400 59.88 59.98
576x432 75.00
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
VGA-1-1 connected (normal left inverted right x axis y axis)
1024x768 60.00 +
1920x1200 59.88 59.95
1920x1080 60.00
1600x1200 60.00
1680x1050 59.95 59.88
1600x900 60.00
1280x1024 60.02
1440x900 59.89 59.90
1360x768 60.02
1280x800 59.81 59.91
800x600 60.32 56.25
640x480 59.94
1024x768 (0x66) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
1680x1050 (0x49) 146.250MHz -HSync +VSync
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz
v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz
1680x1050 (0x4a) 119.000MHz +HSync -VSync
h: width 1680 start 1728 end 1760 total 1840 skew 0 clock 64.67KHz
v: height 1050 start 1053 end 1059 total 1080 clock 59.88Hz
1600x900 (0x4e) 108.000MHz +HSync +VSync
h: width 1600 start 1624 end 1704 total 1800 skew 0 clock 60.00KHz
v: height 900 start 901 end 904 total 1000 clock 60.00Hz
1280x1024 (0x51) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1280x800 (0x5a) 83.500MHz -HSync +VSync
h: width 1280 start 1352 end 1480 total 1680 skew 0 clock 49.70KHz
v: height 800 start 803 end 809 total 831 clock 59.81Hz
1280x800 (0x5b) 71.000MHz +HSync -VSync
h: width 1280 start 1328 end 1360 total 1440 skew 0 clock 49.31KHz
v: height 800 start 803 end 809 total 823 clock 59.91Hz
800x600 (0x7e) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
800x600 (0x7f) 36.000MHz +HSync +VSync
h: width 800 start 824 end 896 total 1024 skew 0 clock 35.16KHz
v: height 600 start 601 end 603 total 625 clock 56.25Hz
640x480 (0x8f) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
The “cut here” call traces are gone, and other nouveau error messages appeared instead:
Aug 19 11:04:14 AnonymPC gnome-shell[1789]: Failed to parse saved session file: Datei »/var/lib/gdm3/.config/mutter/sessions/1062c774bb1fe34ee617555942529207000000016610000.ms« konnte nicht geöffnet werden: Datei oder Verzeichnis nicht gefunden
Aug 19 11:04:14 AnonymPC kernel: nouveau 0000:65:00.0: gsp: mmu fault queued
Aug 19 11:04:14 AnonymPC kernel: nouveau 0000:65:00.0: gsp: rc engn:00000001 chid:32 type:31 scope:1 part:233
Aug 19 11:04:14 AnonymPC kernel: nouveau 0000:65:00.0: fifo:001001:0004:0020:[gst-plugin-scan[1950]] errored - disabling channel
Aug 19 11:04:14 AnonymPC kernel: nouveau 0000:65:00.0: gst-plugin-scan[1950]: channel 32 killed!
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: nouveau: kernel rejected pushbuf: No such device
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: nouveau: ch32: krec 0 pushes 1 bufs 2 relocs 0
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: nouveau: ch32: buf 00000000 0000000b 00000004 00000004 00000000 0x7f0920286000 0x5b0000 0x80000
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: nouveau: ch32: buf 00000001 00000019 00000004 00000004 00000004 (nil) 0x7dc000 0x1000
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: nouveau: ch32: psh 00000000 0000000cf4 0000000d08
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: [0x00000000] HDR 200406c0 subch 0 NINC
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: mthd 1b00 NVC597_SET_REPORT_SEMAPHORE_A
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .OFFSET_UPPER = (0x0)
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: mthd 1b04 NVC597_SET_REPORT_SEMAPHORE_B
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .OFFSET_LOWER = (0x21c000)
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: mthd 1b08 NVC597_SET_REPORT_SEMAPHORE_C
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .PAYLOAD = (0xf)
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: mthd 1b0c NVC597_SET_REPORT_SEMAPHORE_D
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .OPERATION = RELEASE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .RELEASE = AFTER_ALL_PRECEEDING_WRITES_COMPLETE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .ACQUIRE = BEFORE_ANY_FOLLOWING_WRITES_START
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .PIPELINE_LOCATION = ALL
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .COMPARISON = EQ
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .AWAKEN_ENABLE = FALSE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .REPORT = NONE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .STRUCTURE_SIZE = ONE_WORD
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .SUB_REPORT = (0x0)
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .REPORT_DWORD_NUMBER = (0x0)
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .FLUSH_DISABLE = FALSE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .REDUCTION_ENABLE = FALSE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .REDUCTION_OP = RED_ADD
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .REDUCTION_FORMAT = UNSIGNED_32
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1950]: .CONDITIONAL_TRAP = FALSE
Aug 19 11:04:14 AnonymPC /usr/libexec/gdm-wayland-session[1653]: dbus-daemon[1653]: [session uid=119 pid=1653 pidfd=5] Successfully activated service 'org.gnome.Shell.Notifications'
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