Long pressing a key will only repeat a few characters or won't repeat at all in the default 17.10 GNOME environment, it affects all keys including backspace and arrows.
It isn't application specific, the problem is always there whether be it terminal or firefox.
Setting the repeat delay to 0 will instantly trigger it, however it will still stop after a few characters.
I freshly installed 17.10 on a Lenovo Ideapad 700, I haven't had the problem in 16.04 with GNOME 3.22.
Edit: Happens in Xorg as well.
---
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: fecka 1156 F...m pulseaudio
/dev/snd/controlC0: fecka 1156 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 17.10
InstallationDate: Installed on 2017-09-28 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170924)
MachineType: LENOVO 80RU
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-12-generic root=UUID=ec711d91-c22f-4be9-8820-b1bdca284667 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
RelatedPackageVersions:
linux-restricted-modules-4.13.0-12-generic N/A
linux-backports-modules-4.13.0-12-generic N/A
linux-firmware 1.168
Tags: artful wayland-session
Uname: Linux 4.13.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/29/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: E5CN56WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lenovo ideapad 700-15ISK
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 700-15ISK
dmi.modalias: dmi:bvnLENOVO:bvrE5CN56WW:bd09/29/2016:svnLENOVO:pn80RU:pvrLenovoideapad700-15ISK:rvnLENOVO:rnLenovoideapad700-15ISK:rvrNODPK:cvnLENOVO:ct10:cvrLenovoideapad700-15ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80RU
dmi.product.version: Lenovo ideapad 700-15ISK
dmi.sys.vendor: LENOVO
---
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: fecka 1156 F...m pulseaudio
/dev/snd/controlC0: fecka 1156 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 17.10
InstallationDate: Installed on 2017-09-28 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170924)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0bda:0821 Realtek Semiconductor Corp.
Bus 001 Device 004: ID 174f:14e6 Syntek
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 80RU
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-12-generic root=UUID=ec711d91-c22f-4be9-8820-b1bdca284667 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
RelatedPackageVersions:
linux-restricted-modules-4.13.0-12-generic N/A
linux-backports-modules-4.13.0-12-generic N/A
linux-firmware 1.168
Tags: artful wayland-session
Uname: Linux 4.13.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/29/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: E5CN56WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lenovo ideapad 700-15ISK
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 700-15ISK
dmi.modalias: dmi:bvnLENOVO:bvrE5CN56WW:bd09/29/2016:svnLENOVO:pn80RU:pvrLenovoideapad700-15ISK:rvnLENOVO:rnLenovoideapad700-15ISK:rvrNODPK:cvnLENOVO:ct10:cvrLenovoideapad700-15ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80RU
dmi.product.version: Lenovo ideapad 700-15ISK
dmi.sys.vendor: LENOVO
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