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mounty1
l33t
Joined: 06 Jul 2006
Posts: 934
Location: Queensland
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 Posted: Tue Aug 31, 2021 8:33 am Post subject: lightdm starts up then immediately removes login dialog box |
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As per this short video (11 MiB), when lightdm starts up, it shows the login dialog as expected, but then immediately removes it. Any idea why? | xrandr: | Screen 0: minimum 8 x 8, current 7424 x 2160, maximum 32767 x 32767
DP1 connected 2560x1600+3840+323 (normal left inverted right x axis y axis) 590mm x 330mm
2560x1600 59.97*+
1920x1200 59.95
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1280x800 59.91
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
DP2 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 950mm x 540mm
3840x2160 30.00* 25.00 24.00 29.97 23.98
1920x2160 59.99
2560x1440 59.95
1920x1080 60.00 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.89
1280x960 60.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 connected 1024x768+6400+832 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.00*
800x600 60.32 56.25
848x480 60.00
640x480 59.94
1680x1050_60.00 59.95
VIRTUAL1 disconnected (normal left inverted right x axis y axis) |
[Fixed syntax in the url -tag. -- Zucca]
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Michael Mounteney |
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figueroa
Advocate
Joined: 14 Aug 2005
Posts: 2961
Location: Edge of marsh USA
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| Posted: Wed Sep 01, 2021 2:46 am Post subject: |
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Is the pretty waterfall picture familiar?
It could be an advanced security feature. (humor)
Did you upgrade to x11-misc/xscreensaver-6.01-r3 recently? (I'm suspecting the new xscreensaver or one of its dependencies of misbehaving and deplcleaned it this afternoon. It will take a day or two to confirm that was the issue, so I'm just dangling this out there.)
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Andy Figueroa
hp pavilion hpe h8-1260t/2AB5; spinning rust x3
i7-2600 @ 3.40GHz; 16 gb; Radeon HD 7570
amd64/23.0/split-usr/desktop (stable), OpenRC, -systemd -pulseaudio -uefi |
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dbtx
Tux's lil' helper
Joined: 20 Jan 2020
Posts: 117
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| Posted: Wed Sep 01, 2021 4:33 pm Post subject: |
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Hello,
Do you have an xorg.conf, or are the other displays being autodetected? It looks like lightdm isn't "immediately removing the dialog" so much as the primary display is dropping out from under it, though briefly. I would guess that lightdm gets confused about where the dialog is or should be, so it doesn't reappear when the wallpaper does. I mean, it's like the primary display comes up instantly and then blinks off and back on while the others are added and Screen 0's dimensions change to 7424x2160. If you disconnect the smaller displays before starting lightdm, does this problem go away? |
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mounty1
l33t
Joined: 06 Jul 2006
Posts: 934
Location: Queensland
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| Posted: Tue Sep 07, 2021 12:21 pm Post subject: |
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dbtx is correct. If I disconnect the other displays, the login dialog appears on the primary display and stays there.
So, next question: is it possible to make the dialog appear on a specific display, or on every display? sddm does the latter.
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Michael Mounteney |
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dbtx
Tux's lil' helper
Joined: 20 Jan 2020
Posts: 117
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| Posted: Wed Sep 08, 2021 7:17 pm Post subject: |
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I don't see an option for that but here are some things you could try:
1. prove that the problem is really the screen layout/dimensions changing:
unplug the other displays, and plug one of them in after the login box appears, to see if it blinks and disappears again
2. if it is, then it's probably a bug in lightdm or the greeter you're using. Maybe upstream thinks you're not supposed to hot-add displays while the login is showing, but one of your monitors took a bit longer to wake up, thus triggering it, so maybe they know or maybe they want to know.
3. Try using a different greeter:
I don't know what x11-misc/lightdm-mini-greeter looks like and I didn't ask if you're using gtk. mini might have better options, or no such problem.
4. try forcing the dialog location in e.g. /etc/lightdm/lightdm-gtk-greeter.conf:
| Code: | [greeter]
position=100 100
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and adjust it as desired, perhaps 1800 900. the default is 50% 50% and that calculation could be the source of the problem
5. try setting a hacky workaround in /etc/lightdm/lightdm.conf:
| Code: | [Seat:*]
display-setup-script=until `xrandr | grep -q 7424`; do sleep 1; done
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"should" stall things until your X screen is at its correct size but I didn't try it. It might not even like bash syntax in there, in which case, paste it into /usr/local/bin/scriptnamehere, chmod +x it, and point to it
6. Brute Force: add Device and Screen and ServerLayout sections to xorg.conf so that Screen 0 is already the right size
HTH |
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