Hello,
To complete my bug report, I have to tell that the problem seems to come
from the fact I use multiple subsequent xrandr commands... However this
was on purpose, because using a one-liner command failed (Xerror, failed
not doing anything, or even machine crash).
I finally found a sequence of command that works...:
$ xrandr --output $INTDISPLAY --mode 3840x2160 --scale 1x1
(reset the internal screen)
$ xrandr --output $INTDISPLAY --mode 3840x2160 --scale 0.666x0.666 --pos 0x0
(configure scaling on internal display)
$ xrandr --output $INTDISPLAY --mode 3840x2160 --scale 0.666x0.666 --pos
0x721 --output $EXTDISPLAY --mode 3840x2160 --scale 1x1 --pos 2558x0
(configure the dual screen in a single command)
From the hardware point of view, I have a Dell Precision 5520 (Intel(R)
Core(TM) i5-7440HQ CPU @ 2.80GHz with Intel® HD Graphics 630, but no
additional Nvidia card), connected to a Dell UltraSharp 27 4K Monitor (
U2718Q) thanks to a Dell Thunderbolt Dock (TB16).
Thanks,
Pierre
On 10/04/2017 11:02 AM, Pierre Neyron wrote:
Hello,
I'd like to report an issue with the computation of the Xorg current
screen size when using xrandr's --scale option.
I'm using a dual screen setup, with a 15" 4K laptop screen, and a 28" 4K
external screen which are positioned the first one left to the second
one. Since I don't use gnome or another window manager which can tweak
the DPI at a higher level (I use e16, the best WM ever :-) ), I rely in
my setup on xrandr's --scale and --pos options, e.g.:
+--------------+
| |
+----------+ EXTERNAL |2
1 |LAPTOP | DISPLAY |1
4 |DISPLAY | DP-1-2 |6
3 |eDP-1 | |0
9 +----------+--------------+
2558 3840
$ xrandr --output eDP-1 --mode 3840x2160 --scale 0.666x0.666
(scaled size = 2558x1439)
$ xrandr --output eDP-1 --pos 0x721
$ xrandr --output DP-1-2 --mode 3840x2160 --scale 1x1
$ xrandr --output DP-1-2 --pos 2558x0
This works quite well with the commands above (some other sequences of
commands may result in errors, though), but the computed current screen
size is wrong (xrandr output provided below): 7680 x 2160 instead of the
expected 6398 x 2160 (2558+3840). As a result, I have a black hole
between virtual screen areas of e16, from x=Xn+6398 to x=Xn+7680 for
each virtual area, which I did not expected. That's very annoying
because it breaks continuity between areas.
(One may notice that there are other black holes in my virtual screen
areas, above my laptop screen display, but those ones are somehow
"expected" from my viewpoint...)
...........+--------------+....
. expected | |B .
+----------+ EXTERNAL |L H. <- unexpected
|LAPTOP | DISPLAY |A O.
|DISPLAY | DP-1-2 |C L.
|eDP-1 | |K E.
+----------+--------------+....
Could this be handled by xrandr (I get Errors when trying commands with
--fb or --fbmm) ?
Or could this be considered a bug in Xorg ?
Or should this be handled by the WM (e16) ?
FYI:
I'm running Debian Stretch, xorg deb pkg 1:7.7+19, e16 master git branch.
$ /usr/lib/xorg/Xorg -version
X.Org X Server 1.19.2
Release Date: 2017-03-02
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.9.0-3-amd64 x86_64 Debian
Current Operating System: Linux caigang 4.13.0-trunk-amd64 #1 SMP Debian
4.13.2-1~exp1 (2017-09-19) x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.13.0-trunk-amd64
root=/dev/mapper/caigang-stretch ro quiet
Build Date: 07 July 2017 06:14:06AM
xorg-server 2:1.19.2-1+deb9u1 (https://www.debian.org/support)
Current version of pixman: 0.34.0
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
$ xrandr --version
xrandr program version 1.5.0
Server reports RandR version 1.5
$ xrandr --prop
Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 8192 x 8192
eDP-1 connected primary 2558x1439+0+721 (normal left inverted right x
axis y axis) 346mm x 194mm
EDID:
00ffffffffffff004d10761400000000
311a0104a52313780eeff1a55534ba25
0a495200000001010101010101010101
0101010101014dd000a0f0703e803020
35005ac2100000180000000000000000
00000000000000000000000000fe0059
32584e44804c51313536443100000000
0002410328001200000b010a202000b1
scaling mode: Full aspect
supported: Full, Center, Full aspect
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
3840x2160 60.00*+
2048x1536 60.00
1920x1440 60.00
1856x1392 60.01
1792x1344 60.01
1920x1200 59.95
1920x1080 59.93
1600x1200 60.00
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
DP-1 disconnected (normal left inverted right x axis y axis)
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
HDMI-1 disconnected (normal left inverted right x axis y axis)
aspect ratio: Automatic
supported: Automatic, 4:3, 16:9
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
DP-2 disconnected (normal left inverted right x axis y axis)
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
HDMI-2 disconnected (normal left inverted right x axis y axis)
aspect ratio: Automatic
supported: Automatic, 4:3, 16:9
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected 3840x2160+2558+0 (normal left inverted right x axis y
axis) 609mm x 349mm
EDID:
00ffffffffffff0010aceca04c355730
191b0104b53d23783eee95a3544c9926
0f5054a54b00714f8180a9c0a940d1c0
e100d10001014dd000a0f0703e803020
3500615d2100001a000000ff00464e38
344b37364b3057354c0a000000fc0044
454c4c205532373138510a20000000fd
0031560a8936000a20202020202001ce
02031df150101f200514041312110302
161507060123091f0783010000565e00
a0a0a0295030203500615d2100001aa3
6600a0f0701f8030203500615d210000
1a4dd000a0f0703e8030203500615d21
00001a023a801871382d40582c250061
5d2100001ebf1600a08038134030203a
00615d2100001a00000000000000004a
3840x2160 60.00*+ 29.98
2560x1440 59.95
2048x1280 59.99
1920x1200 59.88
2048x1080 24.00
1920x1080 60.00 60.00 50.00 59.94 24.00 23.98
1600x1200 60.00
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DP-1-3 disconnected (normal left inverted right x axis y axis)
Best regards,
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