Disable input from laptop keyboard input

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I am getting random input of Up key causing browser and other application causing unintended scrolling.
I have disabled up up key from from xmodmap
$xmodmap -pke | grep -i up
keycode 80 = KP_Up KP_8 KP_Up KP_8
keycode 133 = Super_L NoSymbol Super_L
keycode 134 = Super_R NoSymbol Super_R
keycode 151 = XF86WakeUp NoSymbol XF86WakeUp
keycode 206 = NoSymbol Super_L NoSymbol Super_L
keycode 233 = XF86MonBrightnessUp NoSymbol XF86MonBrightnessUp
keycode 238 = XF86KbdBrightnessUp NoSymbol XF86KbdBrightnessUp
$uname -a
Linux renegade 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
$xmodmap -pke | grep -i up
keycode 80 = KP_Up KP_8 KP_Up KP_8
keycode 133 = Super_L NoSymbol Super_L
keycode 134 = Super_R NoSymbol Super_R
keycode 151 = XF86WakeUp NoSymbol XF86WakeUp
keycode 206 = NoSymbol Super_L NoSymbol Super_L
keycode 233 = XF86MonBrightnessUp NoSymbol XF86MonBrightnessUp
keycode 238 = XF86KbdBrightnessUp NoSymbol XF86KbdBrightnessUp
$

I captured input using sudo evtest and I can see input value with scan code c8 multiple times within seconds. How can i disable this input.
I am using DELL laptop.
Event: time 1596356833.698079, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.698079, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.698079, ————– SYN_REPORT ————
Event: time 1596356833.729516, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.729516, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.729516, ————– SYN_REPORT ————
Event: time 1596356833.758025, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.758025, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.758025, ————– SYN_REPORT ————
Event: time 1596356833.789753, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.789753, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.789753, ————– SYN_REPORT ————
Event: time 1596356833.822339, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.822339, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.822339, ————– SYN_REPORT ————
Event: time 1596356833.853520, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.853520, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.853520, ————– SYN_REPORT ————
Event: time 1596356833.885129, type 4 (EV_MSC), code 4 (MSC_SCAN), value c8
Event: time 1596356833.885129, type 1 (EV_KEY), code 103 (KEY_UP), value 2
Event: time 1596356833.885129, ————– SYN_REPORT ————

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