There is this weird issue when scrolling fast on a long page and suddenly the touchpad stops scrolling and the cursor move instead, then trying to scroll again works fine, but it's always happening, and it's really annoying.
I've got an external screen that works fine and my machine detects it's resolution properly, but I've extended this monitor with an external cable and this is the problem:
The maximum screen resolution became 1024x768 and adding a new resolution using cvt and xrandr doesn't solve the problem, it creates a gap between the main display and the external display that is invisible! and there is an empty space at the end of the external display that I can't reach.
There is an answer that recommends using cvt -r to solve the problem of the unreachable part of the external display but it doesn't remove the gap between the main display and the external display.
The maximum external display resolution is 1280x1024.
EDIT:
The output of xrandr
$xrandr
Screen 0: minimum 8 x 8, current 2390 x 768, maximum 16384 x 16384
LVDS-1-1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
1366x768 60.05*+
1360x768 59.80 59.96
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
VGA-1-1 connected 1024x768+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.00*
800x600 60.32 56.25
848x480 60.00
640x480 59.94
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
No matter what I do the result is there no image/video thumbnails
$ thunar --version
Thunar 1.6.15 (Xfce 4.12)
$ sudo apt install tumbler tumbler-plugins-extra ffmpegthumbnailer
Reading package lists... Done
Building dependency tree
Reading state information... Done
ffmpegthumbnailer is already the newest version (2.1.1-0.1build1).
tumbler is already the newest version (0.2.1-0ubuntu1).
tumbler-plugins-extra is already the newest version (0.2.1-0ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
$ mv ~/.config/Thunar ~/.config/Thunar.bak
also enabled thumbnails in thunar:
