Arch/Plasma-5.18.3/KWin/X11/Firefox/vsync

Intel G630
4k resolution
XPS 15 9560
Firefox 76 Nightly

Anyone who can get constant 60 fps on https://www.vsynctester.com/ ?

On Google Chrome it's possible, almost 58+ fps. but not in Firefox. very choppy with compositor on.

If compositor off -> 55+ fps. quite smooth scrolling. but tearing when scroll.

What I've tried,

- KWIN_TRIPLE_BUFFER=1 (no effect)

Code: Select all

❯ inxi -Fz
System:    Host: a Kernel: 5.5.11-arch1-1 x86_64 bits: 64 Desktop: KDE Plasma 5.18.3 Distro: Arch Linux
Machine:   Type: Laptop System: Dell product: XPS 15 9560 v: N/A serial: <filter>
           Mobo: Dell model: 0YH90J v: A04 serial: <filter> UEFI: Dell v: 1.18.0 date: 11/17/2019
Battery:   ID-1: BAT0 charge: 73.7 Wh condition: 73.7/97.0 Wh (76%)
CPU:       Topology: Quad Core model: Intel Core i7-7700HQ bits: 64 type: MT MCP L2 cache: 6144 KiB
           Speed: 1063 MHz min/max: 800/2800 MHz Core speeds (MHz): 1: 1007 2: 1000 3: 1000 4: 1011 5: 1000 6: 1065 7: 1000
           8: 1000
Graphics:  Device-1: Intel HD Graphics 630 driver: i915 v: kernel
           Device-2: NVIDIA GP107M [GeForce GTX 1050 Mobile] driver: N/A
           Display: x11 server: X.Org 1.20.7 driver: modesetting unloaded: vesa resolution: 3840x2160~60Hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v: 4.6 Mesa 19.3.4
Audio:     Device-1: Intel CM238 HD Audio driver: snd_hda_intel
           Sound Server: ALSA v: k5.5.11-arch1-1
Network:   Device-1: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter driver: ath10k_pci
           IF: wlan0 state: up mac: <filter>
           Device-2: Qualcomm Atheros type: USB driver: btusb
           IF-ID-1: vmnet1 state: unknown speed: N/A duplex: N/A mac: <filter>
           IF-ID-2: vmnet8 state: unknown speed: N/A duplex: N/A mac: <filter>
Drives:    Local Storage: total: 476.94 GiB used: 217.34 GiB (45.6%)
           ID-1: /dev/nvme0n1 vendor: Micron model: PC300 NVMe SK hynix 512GB size: 476.94 GiB
Partition: ID-1: / size: 271.84 GiB used: 217.12 GiB (79.9%) fs: ext4 dev: /dev/nvme0n1p3
           ID-2: /boot size: 511.0 MiB used: 222.8 MiB (43.6%) fs: vfat dev: /dev/nvme0n1p1
           ID-3: swap-1 size: 8.00 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/nvme0n1p2
Sensors:   System Temperatures: cpu: 49.5 C mobo: N/A
           Fan Speeds (RPM): cpu: 0 fan-2: 0
Info:      Processes: 275 Uptime: 1h 41m Memory: 15.49 GiB used: 3.52 GiB (22.7%) Shell: fish inxi: 3.0.37

KWIN_TRIPLE_BUFFER=0 solved problem. not 1.

Not super smooth. But much better.