Monitor is missing EDID, custom xorg output mode has black border

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Hello people,

Description

I recently bought a Samsung S24D330H 24inch monitor with a native 1920x1080 resolution. Connection is an HDMI2VGA adapter (my laptop does not have an HDMI port unfortunately).

I use a laptop with monitor 15.6 inch and 1920x1080.

In Fedora 25 (also Ubuntu 16.04) the resolution does not appear (only 1024x768). The EDID file is missing for the external monitor (probably a new model), i checked.

I added the resolution manually using xrandr

xrandr --addmode DP2 1920x1080

xrandr --output DP2 --mode 1920x1080

the resolution changes but there is a black border on the left side about an inch or two.

I also tried

• the cvt and cvt -r options (cvt 1920 1080 60) and xrandr --newmode. The whole screen goes blank.

• specifying the size with --size 531x298 or --fbmm 531x298. Nothing changed.

• specifying --dpi 92

• making a conf file in xorg.conf.d ( 10-monitor.conf shown at the end). Nothing changed.

• connecting with the VGA cable directly (without the adapter). The black border on the left actually becomes an inch larger.

• disabling the laptop monitor. Nothing changes.

Conclusion

I think the display manager does not understand the external monitor is 24inch and mirrors the laptop display or dpi is not set properly. Any suggestions/guidance is appreciated.

xrandr output

Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767 eDP1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y axis) 340mm x 190mm 1920x1080 60.01*+ 40.00
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)

DP2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm 1920x1080 60.01+ 60.01 1024x768 60.00
800x600 60.32 56.25
848x480 60.00
640x480 59.94
HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis)

display driver detail

*-display
description: VGA compatible controller product: Haswell-ULT Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vgacontroller busmaster cap_list rom configuration: driver=i915 latency=0 resources: irq:47 memory:d0000000-d03fffff memory:c0000000-cfffffff ioport:3000(size=64) memory:c0000-dffff

xorg.conf.d/10-monitor.conf

Section "Monitor" Identifier "DP2" DisplaySize 531 298 Option "PreferredMode" "1920x1080" EndSection

Section "Screen" Identifier "Screen0" Monitor "DP2" DefaultDepth 24 SubSection "Display" Modes "1920x1080" EndSubSection EndSection

Section "Device" Identifier "Device0" Driver "intel" EndSection