Thanks for getting back with me. I removed "acpi*" from the /etc/default/grub file.The line now reads: GRUB_CMDLINE_LINUX_DEFAULT="blacklist=nouveau elevator=deadline drmdebug=0xe quiet splash" I did "sudo update-grub" and then rebooted, The trackpad is still not recognized. $ grep -i name /proc/bus/input/devices N: Name="Sleep Button" N: Name="Power Button" N: Name="Lid Switch" N: Name="Power Button" N: Name="AT Translated Set 2 keyboard" N: Name="Video Bus" N: Name="Video Bus" N: Name="HD Webcam: HD Webcam" N: Name="HDA Intel PCH Mic" N: Name="HDA Intel PCH Headphone" N: Name="HDA Intel PCH HDMI/DP,pcm=3" N: Name="HDA Intel PCH HDMI/DP,pcm=7" N: Name="HDA Intel PCH HDMI/DP,pcm=8" N: Name="HDA Intel PCH HDMI/DP,pcm=9" N: Name="HDA Intel PCH HDMI/DP,pcm=10" N: Name="PixArt HP USB Optical Mouse" On Fri, Feb 22, 2019 at 4:20 AM Kai-Heng Feng