Good day,

I've got Plasma 5 installed on my Gentoo system. When I connect HDMI to my laptop I cannot mirror display from my laptop to TV so I cannot see the reflection of my laptop desktop and activity on TV. In Display Configuration I get either Laptop Screen or HDMI screen. I can drag a window to HDMI screen but that's not what I want. I also can superimpose laptop screen over HDMI Screen (which only provides partial solution) but my laptop screen is smaller than HDMI TV and so laptop screen doesn't scale proportionally to the size of TV when I superimpose laptop on HDMI screen.

In KDE4 all I had to do was plug in HDMI cable into my laptop and my desktop immediately reflected on TV. With Plasma 5 I no longer seem to have this functionality. Or is there a way to make my laptop display contents mirror on TV? Please advise.

Thanks,
Victor.

Is the display mirroring functionality through HDMI connection really unavailable in KDE5?

That would really be unfortunate because I won't be able to showcase KDE5 desktop on our big TV screen during company's meetings

"kcmshell5 kscreen", try "unify outputs"

In general that's not a feature of the DE - you can "xrandr --output <you hdmi> --same-as <your laptop>", check the output of "xrandr -q" for the present devices.


Oh, and sulking around after less then a day because none of you slaves jumped up to read your post right after you wrote it and reply instantly is maybe not the best kind of self-introduction.

Hi,

Thanks for the message. I'll try your advise at work in the office tomorrow. Sorry for being impatient, I am just too eager to show off my beautiful KDE5 desktop

luebking wrote:"kcmshell5 kscreen", try "unify outputs"

In general that's not a feature of the DE - you can "xrandr --output <you hdmi> --same-as <your laptop>", check the output of "xrandr -q" for the present devices.


Oh, and sulking around after less then a day because none of you slaves jumped up to read your post right after you wrote it and reply instantly is maybe not the best kind of self-introduction.

Unfortunately, this advise did not help. I tried all of the above but the result was exactly what was already mentioned in OP - the laptop screen fit inside larger TV screen but did NOT scale/resize DE content proportionally to TV screen size. Is there a way to make laptop DE content project it's content proportionally to TV screen? This is the output of 'xrandr -q' command:

Code: Select all

eDP1 connected primary 1600x900+0+56 (normal left inverted right x axis y axis) 382mm x 215mm
   1600x900      59.99*+  40.00 
   1024x768      60.00 
   800x600       60.32    56.25 
   640x480       59.94 
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1920x1080+1784+0 (normal left inverted right x axis y axis) 708mm x 398mm
   1920x1080     60.00*+  59.94    30.00    24.00    29.97    23.98 
   1920x1080i    60.00    59.94 
   1600x1200     60.00 
   1280x1024     75.02    60.02 
   1360x768      60.02 
   1280x768      59.87 
   1280x720      60.00    59.94 
   1024x768      75.08    70.07    60.00 
   800x600       72.19    75.00    60.32    56.25 
   720x480       60.00    59.94 
   640x480       75.00    72.81    60.00    59.94 
   720x400       70.08 
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


When I issue 'xrandr --output HDMI1 --same-as eDP1' I get exactly the same result when dragging laptop screen on top of TV screen in "Display Configuration setting". Is there a way to use 'xrandr' command to specify to scale proportionally laptop's DE content onto TV screen?

Also, I am a bit surprised that "mirror displays" feature is not part of KDE5. AFAIK, the whole point of building KDE5 is to expose it to as much audience as possible (like mobile devices) so people can see what KDE5 looks like. Obviously, KDE5 developers went to great lengths to make the DE as visually appealing as possible. And the feature like "mirror displays" that helps expose this DE to a wider audience is not available out-of-the-box? Doesn't make sense.

Thanks,
Victor.

The screens don't fit - the closest common resolution is XGA (1024x768 ...)
You can try to "xrandr .. --addmode", but likely your screen just turns off if you try to address it with an incompatible mode.

=> You'll likely have to scale one screen in the driver:
xrandr --output eDP1 --scale 1.2x1.2

Depending on your GPU/driver, this can completely knock out your system performance (and looks "unsharp" for sure), but it works ok with the nvidia blob (at least).
The nvidia driver also has screen config utilities (supporting this) in "nvidia-settings"