[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Natalie Clarius]

https://bugs.kde.org/show_bug.cgi?id=362058

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=362058

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=362058

--- Comment #16 from Nate Graham  ---
Like I said, in another bug report please.

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[ProstMeister]

https://bugs.kde.org/show_bug.cgi?id=362058

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[ProstMeister]

https://bugs.kde.org/show_bug.cgi?id=362058

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[ProstMeister]

https://bugs.kde.org/show_bug.cgi?id=362058

ProstMeister  changed:

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--- Comment #15 from ProstMeister  ---
kscreen-doctor -o output BEFORE fixing the screen settings:
Output: 66 eDP1 enabled connected primary Panel Modes: 72:1920x1080@60*!
190:1680x1050@60 193:1280x1024@60 201:1024x768@60 205:800x600@60 206:800x600@56
213:640x480@60 1574:1400x1050@60 1575:1600x900@60 1576:1600x900@60
1577:1600x900@60 1578:1400x900@60 1579:1400x900@60 1580:1280x960@60
1581:1368x768@60 1582:1368x768@60 1583:1368x768@60 1584:1280x800@60
1585:1280x800@60 1586:1280x720@60 1587:1280x720@60 1588:1280x720@60
1589:1024x576@60 1590:1024x576@60 1591:1024x576@60 1592:960x540@60
1593:960x540@60 1594:960x540@60 1595:864x486@60 1596:864x486@60 1597:864x486@60
1598:720x405@60 1599:720x405@60 1600:720x405@59 1601:640x360@60 1602:640x360@59
1603:640x360@60 Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr:
incapable RgbRange: unknown primary
Output: 67 DP1 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 68 HDMI1 disabled disconnected  HDMI Modes: Geometry: 0,0 0x0 Scale: 1
Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 69 HDMI2 enabled connected  HDMI Modes: 73:1920x1200@60*!
187:1920x1080@60 188:1920x1080@50 189:1920x1080@60 192:1280x1024@75
193:1280x1024@60 195:1152x864@75 196:1280x720@60 197:1280x720@50
198:1280x720@60 199:1024x768@75 201:1024x768@60 204:800x600@75 205:800x600@60
207:720x576@50 208:720x480@60 209:720x480@60 210:640x480@75 212:640x480@60
213:640x480@60 214:720x400@70 1604:1920x1080@60 1605:1920x1080@50
1606:1920x1080@24 1607:1920x1080@60 1608:1920x1080@24 1609:1600x1200@60
1610:720x576@50 1611:720x480@60 1612:720x480@60 Geometry: 950,1080 1920x1200
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 70 VIRTUAL1 disabled disconnected  Unknown Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 185 DVI-I-2-1 enabled connected  DVI Modes: 187:1920x1080@60*!
188:1920x1080@50 189:1920x1080@60 190:1680x1050@60 191:1600x900@60
192:1280x1024@75 193:1280x1024@60 194:1440x900@60 195:1152x864@75
196:1280x720@60 197:1280x720@50 198:1280x720@60 199:1024x768@75 200:1024x768@70
201:1024x768@60 202:832x624@75 203:800x600@72 204:800x600@75 205:800x600@60
206:800x600@56 207:720x576@50 208:720x480@60 209:720x480@60 210:640x480@75
211:640x480@73 212:640x480@60 213:640x480@60 214:720x400@70 Geometry: 1920,0
1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 246 DVI-I-3-2 enabled connected  DVI Modes: 187:1920x1080@60*!
188:1920x1080@50 189:1920x1080@60 190:1680x1050@60 191:1600x900@60
192:1280x1024@75 193:1280x1024@60 194:1440x900@60 195:1152x864@75
196:1280x720@60 197:1280x720@50 198:1280x720@60 199:1024x768@75 200:1024x768@70
201:1024x768@60 202:832x624@75 203:800x600@72 204:800x600@75 205:800x600@60
206:800x600@56 207:720x576@50 208:720x480@60 209:720x480@60 210:640x480@75
211:640x480@73 212:640x480@60 213:640x480@60 214:720x400@70 Geometry: 3840,0
1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 279 DVI-I-4-3 disabled disconnected  DVI Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 312 DVI-I-5-4 disabled disconnected  DVI Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 


kscreen-doctor -o AFTER fixing the screen settings:
Output: 66 eDP1 disabled connected  Panel Modes: 72:1920x1080@60!
190:1680x1050@60 193:1280x1024@60 201:1024x768@60 205:800x600@60 206:800x600@56
213:640x480@60 1574:1400x1050@60 1575:1600x900@60 1576:1600x900@60
1577:1600x900@60 1578:1400x900@60 1579:1400x900@60 1580:1280x960@60
1581:1368x768@60 1582:1368x768@60 1583:1368x768@60 1584:1280x800@60
1585:1280x800@60 1586:1280x720@60 1587:1280x720@60 1588:1280x720@60
1589:1024x576@60 1590:1024x576@60 1591:1024x576@60 1592:960x540@60
1593:960x540@60 1594:960x540@60 1595:864x486@60 1596:864x486@60 1597:864x486@60
1598:720x405@60 1599:720x405@60 1600:720x405@59 1601:640x360@60 1602:640x360@59
1603:640x360@60 Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr:
incapable RgbRange: unknown 
Output: 67 DP1 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 68 HDMI1 disabled disconnected  HDMI Modes: Geometry: 0,0 0x0 Scale: 1
Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 69 HDMI2 enabled connected  HDMI Modes: 73:1920x1200@60*!
187:1920x1080@60 188:1920x1080@50 189:1920x1080@60 192:1280x1024@75
193:1280x1024@60 195:1152x864@75 196:1280x720@60 197:1280x720@50
198:1280x720@60 

[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=362058

--- Comment #14 from Nate Graham  ---
Like I said:
> Unfortunately each of you who are experiencing this issue could easily be
> experiencing it for a completely different reason. Multimonitor bugs are
> weird like that.
> 
> Can I ask each of you to file a new bug report, and paste the output of
> `kscreen-doctor -o` before and after sleep? Thanks! Also please mention what
> GPU hardware you're using.
> 
> As for this bug, the original reporter never responded, so it's not
> actionable for the specific issue he was reporting and we have to close it.
> Everyone else, please do file your own bug reports. Thanks a lot!

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[r0ck3r]

https://bugs.kde.org/show_bug.cgi?id=362058

--- Comment #13 from r0ck3r  ---
I have very stange things after upgrading to Fedora 37. On Fedora 36 I had
troubles after waking up displays from power save mode, such as loosing
positions of windows, panels and widgets. After upgrading to 37 my middle
display, connected to DP, won't start at all after powersave and I have massive
visual glitches on left and right displays. By pressing Ctrl+Alt+F12 and
disabling graphic effects, glitches are gone, but I still can't enable main
display. I try to enable this display manual via kscreen settings, but with no
luck. Sometimes, I can do that, but almost - no. When I reboot my PC, middle
display stays disabled. Only what I can do - is switching to Wayland,
reconfiguring displays and start Xorg again. After this, display works as
expected until next powersave. Another strange thing: after I have this bug,
when I try to logout from KDE to switch to Wayland, SDDM freezes. But it is
shown on all displays

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[r0ck3r]

https://bugs.kde.org/show_bug.cgi?id=362058

r0ck3r  changed:

   What|Removed |Added

Version|5.19.5  |5.26.3
   Platform|Manjaro |Fedora RPMs

--- Comment #12 from r0ck3r  ---
Output: 445 DVI-D-0 disabled disconnected  DVI Modes: Geometry: 0,0 0x0 Scale:
1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 446 HDMI-0 enabled connected  HDMI Modes: 447:1920x1080@60*!
448:1920x1080@75 449:1920x1080@60 450:1920x1080@50 451:1920x1080@60
452:1920x1080@50 453:1680x1050@60 454:1280x1024@75 455:1280x1024@60
456:1280x960@60 457:1280x720@60 458:1280x720@60 459:1280x720@50 460:1024x768@75
461:1024x768@70 462:1024x768@60 463:800x600@75 464:800x600@72 465:800x600@60
466:800x600@56 467:720x576@50 468:720x480@60 469:640x480@75 470:640x480@73
471:640x480@72 472:640x480@60 473:640x480@60 Geometry: 4480,360 1920x1080
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 474 HDMI-1 enabled connected  HDMI Modes: 447:1920x1080@60*!
448:1920x1080@75 449:1920x1080@60 450:1920x1080@50 451:1920x1080@60
452:1920x1080@50 453:1680x1050@60 454:1280x1024@75 455:1280x1024@60
456:1280x960@60 457:1280x720@60 458:1280x720@60 459:1280x720@50 460:1024x768@75
461:1024x768@70 462:1024x768@60 463:800x600@75 464:800x600@72 465:800x600@60
466:800x600@56 467:720x576@50 468:720x480@60 469:640x480@75 470:640x480@73
471:640x480@72 472:640x480@60 473:640x480@60 Geometry: 0,360 1920x1080 Scale: 1
Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 475 DP-0 enabled connected primary DisplayPort Modes: 447:1920x1080@60
449:1920x1080@60 450:1920x1080@50 453:1680x1050@60 454:1280x1024@75
455:1280x1024@60 457:1280x720@60 458:1280x720@60 459:1280x720@50
460:1024x768@75 461:1024x768@70 462:1024x768@60 463:800x600@75 464:800x600@72
465:800x600@60 466:800x600@56 467:720x576@50 468:720x480@60 469:640x480@75
470:640x480@73 472:640x480@60 476:2560x1440@144*! 477:2560x1440@120
478:2560x1440@100 479:2560x1440@60 480:1600x900@60 481:1440x900@60
482:1280x800@60 483:1152x864@75 Geometry: 1920,0 2560x1440 Scale: 1 Rotation: 1
Overscan: 0 Vrr: incapable RgbRange: unknown primary
Output: 484 DP-1 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 485 DP-2 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 486 DP-3 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[r0ck3r]

https://bugs.kde.org/show_bug.cgi?id=362058

--- Comment #11 from r0ck3r  ---
It was after fail. Next will be before

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[r0ck3r]

https://bugs.kde.org/show_bug.cgi?id=362058

r0ck3r  changed:

   What|Removed |Added

 CC||r0c...@bk.ru

--- Comment #10 from r0ck3r  ---
Output: 445 DVI-D-0 disabled disconnected  DVI Modes: Geometry: 0,0 0x0 Scale:
1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 446 HDMI-0 enabled connected  HDMI Modes: 447:1920x1080@60*!
448:1920x1080@75 449:1920x1080@60 450:1920x1080@50 451:1920x1080@60
452:1920x1080@50 453:1680x1050@60 454:1280x1024@75 455:1280x1024@60
456:1280x960@60 457:1280x720@60 458:1280x720@60 459:1280x720@50 460:1024x768@75
461:1024x768@70 462:1024x768@60 463:800x600@75 464:800x600@72 465:800x600@60
466:800x600@56 467:720x576@50 468:720x480@60 469:640x480@75 470:640x480@73
471:640x480@72 472:640x480@60 473:640x480@60 Geometry: 4480,360 1920x1080
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 474 HDMI-1 enabled connected  HDMI Modes: 447:1920x1080@60*!
448:1920x1080@75 449:1920x1080@60 450:1920x1080@50 451:1920x1080@60
452:1920x1080@50 453:1680x1050@60 454:1280x1024@75 455:1280x1024@60
456:1280x960@60 457:1280x720@60 458:1280x720@60 459:1280x720@50 460:1024x768@75
461:1024x768@70 462:1024x768@60 463:800x600@75 464:800x600@72 465:800x600@60
466:800x600@56 467:720x576@50 468:720x480@60 469:640x480@75 470:640x480@73
471:640x480@72 472:640x480@60 473:640x480@60 Geometry: 0,360 1920x1080 Scale: 1
Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 475 DP-0 disabled connected primary DisplayPort Modes: 447:1920x1080@60
449:1920x1080@60 450:1920x1080@50 453:1680x1050@60 454:1280x1024@75
455:1280x1024@60 457:1280x720@60 458:1280x720@60 459:1280x720@50
460:1024x768@75 461:1024x768@70 462:1024x768@60 463:800x600@75 464:800x600@72
465:800x600@60 466:800x600@56 467:720x576@50 468:720x480@60 469:640x480@75
470:640x480@73 472:640x480@60 476:2560x1440@144! 477:2560x1440@120
478:2560x1440@100 479:2560x1440@60 480:1600x900@60 481:1440x900@60
482:1280x800@60 483:1152x864@75 Geometry: 0,0 2560x1440 Scale: 1 Rotation: 1
Overscan: 0 Vrr: incapable RgbRange: unknown primary
Output: 484 DP-1 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown 
Output: 485 DP-2 disabled disconnected  DisplayPort Modes: Geometry: 0,0 0x0
Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=362058

Nate Graham  changed:

   What|Removed |Added

 Status|CONFIRMED   |RESOLVED
 Resolution|--- |WORKSFORME
 CC||n...@kde.org

--- Comment #9 from Nate Graham  ---
Unfortunately each of you who are experiencing this issue could easily be
experiencing it for a completely different reason. Multimonitor bugs are weird
like that.

Can I ask each of you to file a new bug report, and paste the output of
`kscreen-doctor -o` before and after sleep? Thanks! Also please mention what
GPU hardware you're using.

As for this bug, the original reporter never responded, so it's not actionable
for the specific issue he was reporting and we have to close it. Everyone else,
please do file your own bug reports. Thanks a lot!

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[ProstMeister]

https://bugs.kde.org/show_bug.cgi?id=362058

--- Comment #8 from ProstMeister  ---
(In reply to ProstMeister from comment #7)
> It also happens in KDE 5.26.2, running an XOrg session, and also after
> rebooting, on top of wakeup after sleep.
> Each time I fire up my laptop, I have to set-up again my 3-monitor settings. 
> This is happening since Plasma 5.26.0 has been released.
> Every time I do this, a new config file is created within
> ~/.local/share/kscreen/. I can post any of them, if needed. 
> The various config files created every time are identical (just compared 2
> of them with Kompare).
> It seems that kscreen just ignores any previously created config file and
> keeps creating a new one every time you change your screens settings.

I forgot to tell you that I'm running on EndeavourOS.

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[ProstMeister]

https://bugs.kde.org/show_bug.cgi?id=362058

ProstMeister  changed:

   What|Removed |Added

 CC||colombo@gmail.com

--- Comment #7 from ProstMeister  ---
It also happens in KDE 5.26.2, running an XOrg session, and also after
rebooting, on top of wakeup after sleep.
Each time I fire up my laptop, I have to set-up again my 3-monitor settings. 
This is happening since Plasma 5.26.0 has been released.
Every time I do this, a new config file is created within
~/.local/share/kscreen/. I can post any of them, if needed. 
The various config files created every time are identical (just compared 2 of
them with Kompare).
It seems that kscreen just ignores any previously created config file and keeps
creating a new one every time you change your screens settings.

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[vmpn]

https://bugs.kde.org/show_bug.cgi?id=362058

vmpn  changed:

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[r0y]

https://bugs.kde.org/show_bug.cgi?id=362058

r0y  changed:

   What|Removed |Added

 CC||myr...@gmx.com
 Status|REPORTED|CONFIRMED
 Ever confirmed|0   |1

--- Comment #6 from r0y  ---
I believe I am experiencing this on Kubuntu 22.04 LTS (since installing in Apr
2022, and through various updates).  If it is a short sleep, no issues.  If it
is longer than a few minutes, the secondary monitor "forgets" the wallpaper and
sets the default one.
My main monitor is a 2K via DP, secondary is a FHD via HDMI.  It is a
custom-built PC (desktop, mid-tower).  Apologies for the "below tech" addition
here, just wanted to add Kubuntu 22.04 into the mix.  DM is in a dark theme,
but I've set the wallpapers in both dark and light themes, and still experience
this.

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Natalie Clarius]

https://bugs.kde.org/show_bug.cgi?id=362058

--- Comment #5 from Natalie Clarius  ---
Created attachment 148688
  --> https://bugs.kde.org/attachment.cgi?id=148688=edit
My /var/log/Xorg.0.log immediately after wakeup

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Natalie Clarius]

https://bugs.kde.org/show_bug.cgi?id=362058

Natalie Clarius  changed:

   What|Removed |Added

 CC||natalie_clar...@yahoo.de

--- Comment #4 from Natalie Clarius  ---
I'm getting the same on 5.24 X11, but with the configuration being changed from
extend to unify. The laptop is my primary screen and on the left, and the
external HDMI monitor is secondary and set to be an extension to the right.
After sleep my laptop screen shows what was previously on only on my secondary
monitor, more precisely the topleft section of it because my laptop screen is
smaller in resolution but the contents are not refitted.

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Jacek Wieczorek]

https://bugs.kde.org/show_bug.cgi?id=362058

Jacek Wieczorek  changed:

   What|Removed |Added

 CC||mrj...@gmail.com

--- Comment #3 from Jacek Wieczorek  ---
I think I'm experiencing this bug too. In my case, each broken screen sleep
leads to wallpaper change on my secondary monitor, disabling the compositor and
sometimes moving certain windows around (usually code-oss).

In my /var/log/Xorg.0.log I can see the the screens disconnecting, exactly as
Matthew Barnes said.

My testing consisted of logging output of `xrandr` in 0.1s intervals throughout
different sleep cycles. I set "Switch off screens after" to 1 minute in system
settings and then woke up the screens after different periods of time. I found
out that if I wake up my computer after 3 or less minutes (including 1 min of
waiting for the screens to switch off), it always wakes up correctly. 

Correct screen wake up after 3 min - everything is fine:
   1562 DP-2 connected 2560x1440+0+0 (normal left inverted right x axis y axis)
597mm x 336mm
   1562 DP-4 connected primary 2560x1440+2560+0 (normal left inverted right x
axis y axis) 597mm x 336mm

Broken wake up after 4 min - monitors temporarily disconnect, compositor is
disabled, wallpapers change, windows are moved around (for DP-4):
   2027 DP-4 connected primary 2560x1440+2560+0 (normal left inverted right x
axis y axis) 597mm x 336mm
  7 DP-4 disconnected primary 2560x1440+2560+0 (normal left inverted right
x axis y axis) 0mm x 0mm
  8 DP-4 disconnected (normal left inverted right x axis y axis)
  7 DP-4 connected (normal left inverted right x axis y axis)
 54 DP-4 connected primary 2560x1440+2560+0 (normal left inverted right x
axis y axis) 597mm x 336mm

Interestingly, when kscreen is not running, the behavior doesn't change but the
logs look a bit differently.
Broken wake up after 4 min, kscreen not running (for DP-4):
   1982 DP-4 connected primary 2560x1440+2560+0 (normal left inverted right x
axis y axis) 597mm x 336mm
 15 DP-4 disconnected primary 2560x1440+2560+0 (normal left inverted right
x axis y axis) 0mm x 0mm
 76 DP-4 connected primary 2560x1440+2560+0 (normal left inverted right x
axis y axis) 600mm x 340mm

I uploaded the compressed logs to this Github repo:
https://github.com/Jacajack/logs/tree/master/dual-monitor. I use `xzcat
log.txt.xz | grep 'DP-2' | uniq -c` to read them.

Some other observations:
 - "Broken" wake up always takes visibly more time than a normal one
 - I can reproduce this behavior on fresh Manjaro Live with or without Nvidia
driver
 - Enabling/disabling DPMS doesn't change anything
 - It doesn't matter whether the lockscreen appears
 - "Auto input switch", "Automatic Standby" and "Smart Energy Saving" in
screens' OSD menus don't affect this behavior

Given that XFCE users report similar behavior and that kscreen is not necessary
for this bug to happen, maybe X.Org is in fact the problem? Maybe we should
think of filing a bug report there?

System info:
  Manjaro Linux, kernel 5.10.49
  plasmashell version: 5.22.3
  xorg version: 1.20.11
  GPU: Nvidia RTX 2070 SUPER
  Nvidia driver version: 470.42.01
  Monitors: 2 x LG Ultragear 27GL850 connected via Display Port

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Matthew Barnes]

https://bugs.kde.org/show_bug.cgi?id=362058

Matthew Barnes  changed:

   What|Removed |Added

 OS|Linux   |All
   Platform|Kubuntu Packages|Manjaro
 CC||mbarnes...@gmail.com
Version|5.5.5   |5.19.5

--- Comment #2 from Matthew Barnes  ---
I am experiencing this issue also.  Looking at the Xorg.0.log I am seeing the
screen disconnect .


[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: disconnected
[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: 1440.0 MHz maximum pixel clock
[ 71289.913] (--) NVIDIA(GPU-0): 
[ 71289.927] (--) NVIDIA(GPU-0): DFP-6: disconnected
[ 71289.927] (--) NVIDIA(GPU-0): DFP-6: Internal DisplayPort
[ 71289.927] (--) NVIDIA(GPU-0): DFP-6: 1440.0 MHz maximum pixel clock
[ 71289.927] (--) NVIDIA(GPU-0): 
[ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): connected
[ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): Internal DisplayPort
[ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): 1440.0 MHz maximum pixel
clock
[ 71290.640] (--) NVIDIA(GPU-0): 
[ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): connected
[ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): Internal DisplayPort
[ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): 1440.0 MHz maximum pixel
clock
[ 71290.649] (--) NVIDIA(GPU-0): 
[ 71290.798] (II) NVIDIA(0): Setting mode "DP-4: nvidia-auto-select @3840x2160
+3840+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}"
[ 71290.937] (II) NVIDIA(0): Setting mode "NULL"
[ 71291.089] (II) NVIDIA(0): Setting mode "DP-2: nvidia-auto-select @3840x2160
+0+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}"
[ 71291.141] (II) NVIDIA(0): Setting mode "DP-2: nvidia-auto-select @3840x2160
+0+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}, DP-4:
nvidia-auto-select @3840x2160 +3840+0 {ViewPortIn=3840x2160,
ViewPortOut=3840x2160+0+0}"

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[KScreen] [Bug 362058] Dual monitor loses settings after screen sleep

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=362058

Martin Gräßlin  changed:

   What|Removed |Added

 CC||mgraess...@kde.org

--- Comment #1 from Martin Gräßlin  ---
this sounds like your XServer "loses" the output - which should not happen on
power management. Could you please check whether that's the case in e.g.
/var/log/Xorg.0.log?

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