Blurry screen on correct resolution

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I’ve connected new monitor to my Ubuntu 16.04, but the image is blurry and monitor complains “For better picture quality change resolution to 2560×1440”.
The problem is that I already set my resolution to 2560×1440 in Ubuntu.

Here is my output from xrandr:

Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
LVDS1 connected (normal left inverted right x axis y axis)
1600×900 60.01 + 40.00
1440×900 59.89
1368×768 60.00
1360×768 59.80 59.96
1152×864 60.00
1280×720 60.00
1024×768 60.00
1024×576 60.00
960×540 60.00
800×600 60.32 56.25
864×486 60.00
800×450 60.00
640×480 59.94
720×405 60.00
640×360 60.00
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 connected primary 2560×1440+0+0 (normal left inverted right x axis y axis) 698mm x 393mm
2560×1440 59.95*+
1920×1080 60.00
1600×1200 60.00
1680×1050 59.95
1400×1050 59.98
1600×900 60.00
1280×1024 75.02 60.02
1440×900 59.89
1152×864 75.00
1280×720 60.00
1024×768 75.08 70.07 60.00
832×624 74.55
800×600 72.19 75.00 60.32 56.25
640×480 75.00 72.81 66.67 60.00
720×400 70.08
test_mode 59.95
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

This is output from get-edid:

leonti ~ $ sudo get-edid | parse-edid
[sudo] password for leonti:
This is read-edid version 3.0.2. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 3
No EDID on bus 4
No EDID on bus 5
No EDID on bus 6
No EDID on bus 7
No EDID on bus 8
2 potential busses found: 1 2
Will scan through until the first EDID is found.
Pass a bus number as an option to this program to go only for that one.
128-byte EDID successfully retrieved from i2c bus 1
Looks like i2c was successful. Have a good day.
Checksum Correct

Section “Monitor”
Identifier “VX3209-2K”
ModelName “VX3209-2K”
VendorName “VSC”
# Monitor Manufactured week 27 of 2017
# EDID version 1.3
# Analog Display
DisplaySize 700 390
Gamma 2.20
Option “DPMS” “true”
Horizsync 24-82
VertRefresh 50-75
# Maximum pixel clock is 170MHz
#Not giving standard mode: 1920×1080, 60Hz
#Not giving standard mode: 1680×1050, 60Hz
#Not giving standard mode: 1600×1200, 60Hz
#Not giving standard mode: 1600×900, 60Hz
#Not giving standard mode: 1440×900, 60Hz
#Not giving standard mode: 1400×1050, 60Hz
#Not giving standard mode: 1280×1024, 60Hz
#Not giving standard mode: 1280×720, 60Hz
Modeline “Mode 0” 241.50 2560 2608 2640 2720 1440 1443 1448 1481 -hsync +vsync
EndSection

Monitor is Viewsonic VX3209-2K connected to Lenovo T420 via VGA cable.

I tried connecting this monitor to another laptop (Macbook) via HDMI cable and the image is sharp and I get no warning about incorrect resolution so it seems the problem is with my current setup, not with the monitor.

Are there any settings that I can adjust to the image sharp?
What can I try?

Cheers,
Leonti

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Marisa

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