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Hi guys,
I have an XPS 15 laptop, that comes with a built-in HiDPI display, and I would really like to get two external monitors, which are not HiDPI to be usable.
I've tried to follow every guide I could find on how to accomplish my task, and the solution with the best results that I could get, is the xrandr panning option, with scaling - from the wiki page on HiDPI.
There is still one problem though when I run this.
My setup is as follows:
List of monitors
Monitor order
Both external displays are configured to 1920x1080 resolution (which is their maximum)
HDMI1 ==> Physical HDMI port on my laptop, screen number 2
HDMI2 ==> Mini DisplayPort on laptop ==> HDMI adapter, screen number 3
eDP1 ==> Internal display
The xrandr command I am running, is:
xrandr
--output HDMI1 --auto --panning [1920*2]x[1080*2]+[0]+0 --scale [2]x[2]
--output HDMI2 --auto --panning [1920*2]x[1080*2]+[1920*2]+0 --scale [2]x[2] --right-of HDMI1
--output eDP1 --auto --panning [3200]x[1800]+[1920*4]+0 --scale [1]x[1] --right-of HDMI2
Which is equivalent to:
xrandr
--output HDMI1 --auto --panning 3840x2160+0+0 --scale 2x2
--output HDMI2 --auto --panning 3840x2160+3840+0 --scale 2x2 --right-of HDMI1
--output eDP1 --auto --panning 3200x1800+7680+0 --scale 1x1 --right-of HDMI2
Now after the command, the HiDPI display is fine, so is display number 2, but display number 3 behaves weirdly - it is enlarged (seems by the scaling factor I provided) and does not fit the screen, when I move the cursor to an edge, it "scrolls" the screen.
I tried different values, and also other options (xrandr without panning) but it only brought more problems.
I'd be really happy if somebody could help me figure this out.
My xrandr (after running the command):
Screen 0: minimum 8 x 8, current 10880 x 2160, maximum 32767 x 32767
eDP1 connected primary 3200x1800+7680+0 (normal left inverted right x axis y axis) 346mm x 194mm panning 3200x1800+7680+0
3200x1800 59.98*+
2880x1620 60.00
2560x1440 60.00
2048x1536 60.00
1920x1440 60.00
1856x1392 60.01
1792x1344 60.01
2048x1152 60.00
1920x1080 60.00
1600x1200 60.00
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1280x960 60.00
1368x768 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 477mm x 268mm panning 3840x2160+0+0
1920x1080 60.00*+
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1024x768 75.08 60.00
800x600 75.00 60.32
640x480 75.00 60.00
720x400 70.08
HDMI2 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 509mm x 286mm panning 3840x2160+3840+0
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1280x720 60.00 50.00 59.94
1024x768 75.08 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
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
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Were you able to get this to work?
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The best I could do was to go the other way and just reduce my laptop HiDPI screen from 3200x1800 to 1600x900:
xrandr --output eDP1 --mode 1600x900 --output DP1 --auto --left-of eDP1
Granted I'm not making use of my high-res laptop display, however I can't tell the difference. If you do graphics-intensive work or have superhuman eyesight this may not be a good solution, or if only rarely then running
xrandr --output eDP1 --auto
at those times might work out. Personal preference, but I find that I do notice a negative difference when using scaling but not just using a lower (but still quite high) resolution. Anyway, if you come up with something better please post what you did. I've also searched all over the place and haven't found the golden answer.
Edit: I also created
$HOME/.config/fontconfig/conf.d/10-HiDPI.conf:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<match target="pattern">
<edit name="dpi" mode="assign">
<double>276</double>
</edit>
</match>
</fontconfig>
and found my fonts look nicer, I just use smaller sizes in my applications. Just get the DPI right for your particular monitor; 276 may work fine if using 3200x1800 natively on a 13-13.3" display.
Last edited by nharward (2016-11-12 00:21:33)
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