I've recently installed Ubuntu 20.04 on a Lenovo ThinkPad L13 Yoga Gen 2 that I got for testing purposes. Naturally I wanted to know how far Ubuntu has come with regard to touchscreen compatibility. My experience so far is quite sobering, though, as the most basic things don't seem to work in most applications:
- I can't enlarge text using the two-finger pinch gesture (e.g. in Firefox or LibreOffice)
- I can't scroll the page down using just one finger; if I do, it will just select the text I move my finger over. (e.g. in Firefox, LibreOffice, Thunderbird)
- I can't call up a context menu on selected text or files using a long press on the selection. (LibreOffice, Nemo, Firefox, Thunderbird)
What am I missing? Does Ubuntu really have these highly complicated four-finger gestures, but doesn't support even the most basic of touchscreen functions? Am I missing drivers or any additional packages?
//edit: I've found a similar question on touchscreen support, but it only asks about Mozilla Firefox and is five years old (meaning it might contain outdated advice). Anyway: is there really no way to set default touchscreen behaviour system-wide, not on a per-application basis?
Here's my inxi -Fxz output in case it's any help.
System: Kernel: 5.8.0-50-generic x86_64 bits: 64 compiler: N/A Desktop: Gnome 3.36.7 Distro: Ubuntu 20.04.2 LTS (Focal Fossa) Machine: Type: Convertible System: LENOVO product: 20VK000VGE v: ThinkPad L13 Yoga Gen 2 serial: <filter> Mobo: LENOVO model: 20VK000VGE v: SDK0J40697 WIN serial: <filter> UEFI: LENOVO v: R1FET29W (1.03 ) date: 10/08/2020 Battery: ID-1: BAT0 charge: 18.4 Wh condition: 46.0/46.0 Wh (100%) model: Celxpert 5B10W13934 status: Discharging CPU: Topology: Quad Core model: 11th Gen Intel Core i5-1135G7 bits: 64 type: MT MCP arch: Tiger Lake rev: 1 L2 cache: 8192 KiB flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 38707 Speed: 800 MHz min/max: 400/800 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 5: 800 6: 801 7: 801 8: 800 Graphics: Device-1: Intel vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 Display: x11 server: X.Org 1.20.9 driver: i915 resolution: 1920x1080~60Hz OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 20.2.6 direct render: Yes Audio: Device-1: Intel vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 00:1f.3 Sound Server: ALSA v: k5.8.0-50-generic Network: Device-1: Intel driver: iwlwifi v: kernel port: 3000 bus ID: 00:14.3 IF: wlp0s20f3 state: up mac: <filter> Device-2: Intel Ethernet I219-V vendor: Lenovo driver: e1000e v: 3.2.6-k port: efa0 bus ID: 00:1f.6 IF: enp0s31f6 state: down mac: <filter> Drives: Local Storage: total: 238.47 GiB used: 23.36 GiB (9.8%) ID-1: /dev/nvme0n1 vendor: Western Digital model: PC SN730 SDBQNTY-256G-1001 size: 238.47 GiB Partition: ID-1: / size: 231.54 GiB used: 23.15 GiB (10.0%) fs: ext4 dev: /dev/dm-1 ID-2: /boot size: 704.5 MiB used: 209.7 MiB (29.8%) fs: ext4 dev: /dev/nvme0n1p2 ID-3: swap-1 size: 976.0 MiB used: 0 KiB (0.0%) fs: swap dev: /dev/dm-2 Sensors: System Temperatures: cpu: 44.0 C mobo: 1.0 C Fan Speeds (RPM): cpu: 0 Info: Processes: 285 Uptime: 1h 10m Memory: 7.45 GiB used: 2.69 GiB (36.1%) Init: systemd runlevel: 5 Compilers: gcc: N/A Shell: bash v: 5.0.17 inxi: 3.0.38
 I've noticed that, for reasons I cannot explain, two-finger pinch zoom and one-finger scrolling does work in help files.