I have a Dell Vostro 3400 with Intel Iris Xe Graphics and I can't get my external monitor to work properly. I've installed the driver i915 and Ubuntu detects the monitor, but I get no signal output to my monitor when I try to power it up, my screen just keeps blinking as if the monitor was getting connected and disconnected consecutively.
--- The driver
$ lspci -nnk | grep -A 3 VGA | grep -E "VGA|driver"
00:02.0 VGA compatible controller [0300]: Intel Corporation TigerLake GT2 [Iris Xe Graphics] [8086:9a49] (rev 01)
Kernel driver in use: i915
---- xrandr output
xrandr
Screen 0: minimum 16 x 16, current 3286 x 1080, maximum 32767 x 32767
XWAYLAND0 connected primary 1366x768+1920+156 (normal left inverted right x axis y axis) 310mm x 170mm
1366x768 59.80*+
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.52
720x480 59.71
640x400 59.95
320x200 58.96
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77
XWAYLAND4 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 670mm x 280mm
1920x1080 59.96*+
1440x1080 59.99
1400x1050 59.98
1280x1024 59.89
1280x960 59.94
1152x864 59.96
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.52
1680x1050 59.95
1440x900 59.89
1280x800 59.81
720x480 59.71
640x400 59.95
320x200 58.96
1600x900 59.95
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77
External monitor is detected
