Hello, im running ubuntu 1904. When i connect external monitor via usbc-hdmi adapter the external monitor 27" 2560x is sluggish, its lagging and slow, especially when scrolling, moving mouse and so on.
The laptop is a huawei matebook 13 and has a intel graphic uhd 620 card and it looks like i have all the drivers. The funny thing is if i close the laptop lid and the external display becomes the only display, the lagging is gone and it works perfectly
the internal screen is a hidpi screen that i run at 150% scaling in ubuntu.
inxi -G
gives me
Code:
Graphics: Device-1: Intel UHD Graphics 620 driver: i915 v: kernel
Display: x11 server: X.Org 1.20.4 driver: none resolution: 2160x1440~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics (Whiskey Lake 3x8 GT2) v: 4.5 Mesa 19.0.8
xrandr gives me
Code:
Screen 0: minimum 8 x 8, current 5120 x 4320, maximum 32767 x 32767
eDP1 connected primary 2160x1440+1745+2880 (normal left inverted right x axis y axis) 280mm x 180mm
2160x1440 60.00*+
1792x1344 60.01
2048x1152 59.90 59.91
1920x1200 59.88 59.95
1920x1080 59.96 59.93
1600x1200 60.00
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.81 59.91
1152x864 60.00
1280x720 59.86 59.74
1024x768 60.00
1080x720 60.00
1024x576 59.90 59.82
960x540 59.63 59.82
800x600 60.32 56.25
864x486 59.92 59.57
640x480 59.94
720x405 59.51 58.99
640x360 59.84 59.32
DP1 connected 5120x2880+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
2560x1440 59.95*+
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 75.02 60.02
1440x900 59.90
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 60.00 59.94
720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
