Hi, I have a Debian PC with a Plasma 6 and the following screen configuration: - Philips monitor connected to the Display Port - LG TV connected to the HDMI port I noticed that when I turn on the PC and SDDM starts to enter my login credentials, if I move the mouse to the left edge, the cursor disappears (this tells me that the PC monitor is treated as a secondary screen on the right, and the TV, even when turned off, is considered the primary screen). However, if I run xrandr, it appears to be the only available and primary output: $ xrandr Screen 0: minimum 16 x 16, current 1920 x 1080, maximum 32767 x 32767 DP-1 connected primary 1920x1080+0+0 (normal left inverted right x-axis y-axis) 476mm x 268mm 1920x1080 59.96*+ ... ... In the applet that configures the displays, all the icons are disabled (this is correct because there is only one active screen). However, the audio through the monitor speakers (display port) is not heard, even though it is active, both from the plasma and from pavucontrol (once again, this confirms that the primary monitor is treated as a secondary screen). Login with x11/Wayland: same behavior To fix it, I had to unplug the TV's HDMI cable and reboot. Everything worked fine. On the login screen, the mouse cursor no longer goes off the edge, and audio through the monitor speakers is heard correctly. In this situation, if I reconnect the TV (HDMI port), the audio continues to work if I select "HDMI digital stereo output" instead of "HDMI2 digital stereo output" in the volume applet profiles (the TV is still off, however, the option to select both the audio output and the internal/external display to use appears). If I leave the TV connected and restart it, everything goes back to normal and the problem recurs: the monitor is again interpreted as a secondary display, the audio through its speakers is not heard, and the profiles only list the option "HDMI2 digital stereo output" (so I have no option to change the "HDMI digital stereo output" setting). It's not the kernel: I checked by booting OpenSuse, which I installed on another partition with the same kernel, and everything works fine (even with the TV connected). However, the versions of QT, Plasma, etc., vary. I don't think the problem is with Plasma, since it occurs before the desktop has even started, so only sddm remains, where moving the mouse off the left edge highlights the problem. The problem is that the system confuses the internal and external monitors, that it intercepts the TV even if it is off and that it arbitrarily assumes that it is the main screen, despite the screen configuration in which I indicate the monitor as primary, and consequently the audio does not reach the monitor's speakers. Thanks, Antonio SOFTWARE/OS VERSIONS KDE Plasma Version: 6.3.6 KDE Frameworks Version: 6.13.0 Qt Version: 6.8.2 Graphics Platform: Wayland
The problem is also solved by unplugging the TV, logging off and then logging in to access the desktop again.
Thanks for the bug report. I'd like to ask you for a couple of details. First - When both displays are (actually) enabled, in Display Configuration - can you confirm which display you have set to be primary? Second - can you run the following in a terminal and paste the output into a reply in this report? kscreen-doctor -o Thanks again.
(In reply to TraceyC from comment #2) > Thanks for the bug report. I'd like to ask you for a couple of details. > > First - When both displays are (actually) enabled, in Display Configuration > - can you confirm which display you have set to be primary? > > Second - can you run the following in a terminal and paste the output into a > reply in this report? > > kscreen-doctor -o > > Thanks again. Hi, when both displays are enabled I set the monitor (connected to the display port) as primary and the LG TV (connected to the HDMI port) as secondary. # with only monitor primary enabled: $ kscreen-doctor -o Output: 1 HDMI-A-1 disabled connected priority 0 HDMI Modes: 1:1920x1080@60*! 2:1920x1080@60 3:1920x1080@60 4:1920x1080@50 5:1920x1080@30 6:1920x1080@30 7:1920x1080@25 8:1920x1080@24 9:1920x1080@24 10:1280x1024@60 11:1360x768@60 12:1152x864@60 13:1280x720@60 14:1280x720@60 15:1280x720@60 16:1280x720@50 17:1024x768@60 18:800x600@60 19:720x576@50 20:720x480@60 21:720x480@60 22:720x480@60 23:720x480@60 24:640x480@60 25:640x480@60 26:640x480@60 27:720x400@70 Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic HDR: disabled Wide Color Gamut: disabled ICC profile: none Color profile source: sRGB Color power preference: prefer efficiency and performance Brightness control: supported, set to 100% and dimming to 100% Output: 2 DP-1 enabled connected priority 1 DisplayPort Modes: 28:1920x1080@60*! 29:1920x1080@60 30:1920x1080@60 31:1920x1080@50 32:1680x1050@60 33:1280x1024@75 34:1280x1024@60 35:1440x900@60 36:1280x960@60 37:1280x720@60 38:1280x720@60 39:1280x720@60 40:1280x720@50 41:1024x768@75 42:1024x768@70 43:1024x768@60 44:832x624@75 45:800x600@75 46:800x600@72 47:800x600@60 48:800x600@56 49:720x576@50 50:720x576@50 51:720x576@50 52:720x480@60 53:720x480@60 54:720x480@60 55:720x480@60 56:720x480@60 57:640x480@75 58:640x480@73 59:640x480@67 60:640x480@60 61:640x480@60 62:640x480@60 63:720x400@70 Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic HDR: incapable Wide Color Gamut: incapable ICC profile: none Color profile source: sRGB Color power preference: prefer efficiency and performance Brightness control: supported, set to 55% and dimming to 100% # with enabled monitors and TV: $ kscreen-doctor -o Output: 1 HDMI-A-1 enabled connected priority 2 HDMI Modes: 1:1920x1080@60*! 2:1920x1080@60 3:1920x1080@60 4:1920x1080@50 5:1920x1080@30 6:1920x1080@30 7:1920x1080@25 8:1920x1080@24 9:1920x1080@24 10:1280x1024@60 11:1360x768@60 12:1152x864@60 13:1280x720@60 14:1280x720@60 15:1280x720@60 16:1280x720@50 17:1024x768@60 18:800x600@60 19:720x576@50 20:720x480@60 21:720x480@60 22:720x480@60 23:720x480@60 24:640x480@60 25:640x480@60 26:640x480@60 27:720x400@70 Geometry: 0,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic HDR: disabled Wide Color Gamut: disabled ICC profile: none Color profile source: sRGB Color power preference: prefer efficiency and performance Brightness control: supported, set to 100% and dimming to 100% Output: 2 DP-1 enabled connected priority 1 DisplayPort Modes: 28:1920x1080@60*! 29:1920x1080@60 30:1920x1080@60 31:1920x1080@50 32:1680x1050@60 33:1280x1024@75 34:1280x1024@60 35:1440x900@60 36:1280x960@60 37:1280x720@60 38:1280x720@60 39:1280x720@60 40:1280x720@50 41:1024x768@75 42:1024x768@70 43:1024x768@60 44:832x624@75 45:800x600@75 46:800x600@72 47:800x600@60 48:800x600@56 49:720x576@50 50:720x576@50 51:720x576@50 52:720x480@60 53:720x480@60 54:720x480@60 55:720x480@60 56:720x480@60 57:640x480@75 58:640x480@73 59:640x480@67 60:640x480@60 61:640x480@60 62:640x480@60 63:720x400@70 Geometry: 1920,0 1920x1080 Scale: 1 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: Automatic HDR: incapable Wide Color Gamut: incapable ICC profile: none Color profile source: sRGB Color power preference: prefer efficiency and performance Brightness control: supported, set to 55% and dimming to 100% # in both cases the output of xrand does not change: $ xrandr Screen 0: minimum 16 x 16, current 1920 x 1080, maximum 32767 x 32767 DP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 476mm x 268mm 1920x1080 59.96*+ ... HDMI-A-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm 1920x1080 59.96*+ ... When both monitors are enabled: - If I click "Extend to the Right" from Display Configuration, even though the main monitor remains primary, it actually becomes secondary, and the mouse moves over the left edge of the TV (and not to the right as it should). - Furthermore, to return to the primary monitor from Display Configuration, I have to click "Switch to External Monitor" (first icon), otherwise, if I click "Switch to Laptop Screen" (second icon), the signal goes to the TV, even if it's off. To go back, I either turn on the TV and switch from there, or I have to use the META+F1 macro to call Display Configuration and blindly move around with the keyboard to restore (because even if I reboot, this setting remains and there's no way to undo it). It would be helpful to be able to assign shortcuts to the Display Settings icons; it would make things easier.
Created attachment 183405 [details] display configuration with active monitor and TV
Thanks for the information. I'll let the kwin developers take a look from here.
Please attach the output of drm_info when the TV is off but still detected. Almost certainly this is a case of "displays are terrible" though, TVs basically never tell the sources about being turned off. If you completely cut the power from the TV, the system should notice it disconnecting.
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Created attachment 185454 [details] drm_info output I have attached the output of drm_info when the problem occurs.
Thanks