Currently Linux on Pixel C is missing GPU Acceleration, therefore the UI is laggy
dmesg is available here
[root@alarm /]# cat /var/log/Xorg.0.log
[ 899.733]
X.Org X Server 1.19.3
Release Date: 2017-03-15
[ 899.733] X Protocol Version 11, Revision 0
[ 899.733] Build Operating System: Linux 3.14.65-16-ARCH aarch64
[ 899.733] Current Operating System: Linux alarm 4.13.0-rc4+ #13 SMP PREEMPT Wed Aug 9 20:46:38 UTC 2017 aarch64
[ 899.733] Kernel command line: cros_secure vpr=0x08000000@0xf6800000 earlycon
[ 899.733] Build Date: 13 August 2017 04:10:10PM
[ 899.733]
[ 899.733] Current version of pixman: 0.34.0
[ 899.733] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 899.733] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 899.733] (==) Log file: "/var/log/Xorg.0.log", Time: Wed Aug 16 12:00:35 2017
[ 899.734] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 899.734] (==) No Layout section. Using the first Screen section.
[ 899.734] (==) No screen section available. Using defaults.
[ 899.734] (**) |-->Screen "Default Screen Section" (0)
[ 899.734] (**) | |-->Monitor "<default monitor>"
[ 899.734] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 899.734] (==) Automatically adding devices
[ 899.734] (==) Automatically enabling devices
[ 899.734] (==) Automatically adding GPU devices
[ 899.734] (==) Automatically binding GPU devices
[ 899.734] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 899.734] (WW) The directory "/usr/share/fonts/Type1/" does not exist.
[ 899.734] Entry deleted from font path.
[ 899.734] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/100dpi/".
[ 899.734] Entry deleted from font path.
[ 899.734] (Run 'mkfontdir' on "/usr/share/fonts/100dpi/").
[ 899.734] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/75dpi/".
[ 899.734] Entry deleted from font path.
[ 899.734] (Run 'mkfontdir' on "/usr/share/fonts/75dpi/").
[ 899.734] (==) FontPath set to:
/usr/share/fonts/misc/,
/usr/share/fonts/TTF/,
/usr/share/fonts/OTF/
[ 899.734] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 899.734] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 899.734] (II) Loader magic: 0x1207d4d20
[ 899.734] (II) Module ABI versions:
[ 899.734] X.Org ANSI C Emulation: 0.4
[ 899.734] X.Org Video Driver: 23.0
[ 899.734] X.Org XInput driver : 24.1
[ 899.734] X.Org Server Extension : 10.0
[ 899.736] (++) using VT number 7
[ 899.736] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[ 899.737] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 899.742] (II) no primary bus or device found
[ 899.742] falling back to /sys/devices/platform/50000000.host1x/drm/drm/card0
[ 899.742] (II) LoadModule: "glx"
[ 899.742] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 899.751] (II) Module glx: vendor="X.Org Foundation"
[ 899.751] compiled for 1.19.3, module version = 1.0.0
[ 899.751] ABI class: X.Org Server Extension, version 10.0
[ 899.751] (==) Matched modesetting as autoconfigured driver 0
[ 899.751] (==) Matched fbdev as autoconfigured driver 1
[ 899.751] (==) Assigned the driver to the xf86ConfigLayout
[ 899.751] (II) LoadModule: "modesetting"
[ 899.751] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 899.751] (II) Module modesetting: vendor="X.Org Foundation"
[ 899.751] compiled for 1.19.3, module version = 1.19.3
[ 899.751] Module class: X.Org Video Driver
[ 899.751] ABI class: X.Org Video Driver, version 23.0
[ 899.752] (II) LoadModule: "fbdev"
[ 899.752] (WW) Warning, couldn't open module fbdev
[ 899.752] (II) UnloadModule: "fbdev"
[ 899.752] (II) Unloading fbdev
[ 899.752] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 899.752] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 899.758] (II) modeset(0): using drv /dev/dri/card0
[ 899.759] (II) modeset(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[ 899.759] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
[ 899.759] (==) modeset(0): RGB weight 888
[ 899.759] (==) modeset(0): Default visual is TrueColor
[ 899.759] (II) Loading sub module "glamoregl"
[ 899.759] (II) LoadModule: "glamoregl"
[ 899.759] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[ 899.761] (II) Module glamoregl: vendor="X.Org Foundation"
[ 899.761] compiled for 1.19.3, module version = 1.0.0
[ 899.761] ABI class: X.Org ANSI C Emulation, version 0.4
[ 899.761] (II) glamor: OpenGL accelerated X.org driver based.
[ 899.872] (II) glamor: EGL version 1.4 (DRI2):
[ 899.872] EGL_MESA_drm_image required.
[ 899.873] (EE) modeset(0): glamor initialization failed
[ 899.873] (II) modeset(0): ShadowFB: preferred NO, enabled NO
[ 899.873] (II) modeset(0): Output DSI-1 has no monitor section
[ 899.873] (II) modeset(0): EDID for output DSI-1
[ 899.873] (II) modeset(0): Printing probed modes for output DSI-1
[ 899.873] (II) modeset(0): Modeline "2560x1800"x60.0 304.42 2560 2640 2720 2800 1800 1804 1808 1812 (108.7 kHz)
[ 899.873] (II) modeset(0): Output DSI-1 connected
[ 899.873] (II) modeset(0): Using sloppy heuristic for initial modes
[ 899.873] (II) modeset(0): Output DSI-1 using initial mode 2560x1800 +0+0
[ 899.873] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
[ 899.873] (==) modeset(0): DPI set to (96, 96)
[ 899.873] (II) Loading sub module "fb"
[ 899.873] (II) LoadModule: "fb"
[ 899.874] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 899.874] (II) Module fb: vendor="X.Org Foundation"
[ 899.874] compiled for 1.19.3, module version = 1.0.0
[ 899.874] ABI class: X.Org ANSI C Emulation, version 0.4
[ 899.874] (==) Depth 24 pixmap format is 32 bpp
[ 899.897] (==) modeset(0): Backing store enabled
[ 899.897] (==) modeset(0): Silken mouse enabled
[ 899.897] (II) modeset(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 899.897] (==) modeset(0): DPMS enabled
[ 899.897] (--) RandR disabled
[ 899.909] (II) AIGLX: Screen 0 is not DRI2 capable
[ 899.909] (EE) AIGLX: reverting to software rendering
[ 899.913] (II) IGLX: enabled GLX_MESA_copy_sub_buffer
[ 899.915] (II) IGLX: Loaded and initialized swrast
[ 899.915] (II) GLX: Initialized DRISWRAST GL provider for screen 0
[ 899.915] (II) modeset(0): Damage tracking initialized
[ 899.915] (II) modeset(0): Setting screen physical size to 677 x 476
[ 900.025] (II) config/udev: Adding input device hid-over-i2c 06CB:3370 (/dev/input/event0)
[ 900.025] (**) hid-over-i2c 06CB:3370: Applying InputClass "libinput touchscreen catchall"
[ 900.025] (II) LoadModule: "libinput"
[ 900.026] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so
[ 900.029] (II) Module libinput: vendor="X.Org Foundation"
[ 900.029] compiled for 1.19.3, module version = 0.25.1
[ 900.029] Module class: X.Org XInput Driver
[ 900.029] ABI class: X.Org XInput driver, version 24.1
[ 900.029] (II) Using input driver 'libinput' for 'hid-over-i2c 06CB:3370'
[ 900.029] (**) hid-over-i2c 06CB:3370: always reports core events
[ 900.029] (**) Option "Device" "/dev/input/event0"
[ 900.029] (**) Option "_source" "server/udev"
[ 900.030] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) is tagged by udev as: Touchscreen
[ 900.031] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) device is a touch device
[ 900.031] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) device removed
[ 900.064] (**) Option "config_info" "udev:/sys/devices/platform/7000c000.i2c/i2c-0/0-0020/0018:06CB:3370.0001/input/input0/event0"
[ 900.064] (II) XINPUT: Adding extended input device "hid-over-i2c 06CB:3370" (type: TOUCHSCREEN, id 6)
[ 900.064] (**) Option "AccelerationScheme" "none"
[ 900.064] (**) hid-over-i2c 06CB:3370: (accel) selected scheme none/0
[ 900.064] (**) hid-over-i2c 06CB:3370: (accel) acceleration factor: 2.000
[ 900.064] (**) hid-over-i2c 06CB:3370: (accel) acceleration threshold: 4
[ 900.065] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) is tagged by udev as: Touchscreen
[ 900.065] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) device is a touch device
[ 900.066] (II) config/udev: Adding input device hid-over-i2c 06CB:3370 (/dev/input/mouse0)
[ 900.066] (II) No input driver specified, ignoring this device.
[ 900.066] (II) This device may have been added with another device file.
[ 900.067] (II) config/udev: Adding input device gpio-keys (/dev/input/event1)
[ 900.067] (**) gpio-keys: Applying InputClass "libinput keyboard catchall"
[ 900.067] (II) Using input driver 'libinput' for 'gpio-keys'
[ 900.067] (**) gpio-keys: always reports core events
[ 900.067] (**) Option "Device" "/dev/input/event1"
[ 900.067] (**) Option "_source" "server/udev"
[ 900.068] (II) event1 - (II) gpio-keys: (II) is tagged by udev as: Keyboard Switch
[ 900.068] (II) event1 - (II) gpio-keys: (II) device is a keyboard
[ 900.068] (II) event1 - (II) gpio-keys: (II) device is a switch device
[ 900.068] (II) event1 - (II) gpio-keys: (II) device removed
[ 900.088] (**) Option "config_info" "udev:/sys/devices/platform/gpio-keys/input/input6/event1"
[ 900.088] (II) XINPUT: Adding extended input device "gpio-keys" (type: KEYBOARD, id 7)
[ 900.089] (II) event1 - (II) gpio-keys: (II) is tagged by udev as: Keyboard Switch
[ 900.089] (II) event1 - (II) gpio-keys: (II) device is a keyboard
[ 900.089] (II) event1 - (II) gpio-keys: (II) device is a switch device
[ 900.884] (II) modeset(0): Disabling kernel dirty updates, not required.
[ 914.720] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) device removed
[ 914.756] (II) event1 - (II) gpio-keys: (II) device removed
[ 915.900] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) is tagged by udev as: Touchscreen
[ 915.900] (II) event0 - (II) hid-over-i2c 06CB:3370: (II) device is a touch device
[ 915.901] (II) event1 - (II) gpio-keys: (II) is tagged by udev as: Keyboard Switch
[ 915.901] (II) event1 - (II) gpio-keys: (II) device is a keyboard
[ 915.901] (II) event1 - (II) gpio-keys: (II) device is a switch device
Currently Linux on Pixel C is missing GPU Acceleration, therefore the UI is laggy
dmesg is available here