for some reason fbdev broke
In pmOS fddev is boroken,(downstream kernel)
lavender:~$ cat /var/log/Xorg.0.log
[ 275.861] (WW) Failed to open protocol names file lib/xorg/protocol.txt
[ 275.861]
X.Org X Server 1.20.8
X Protocol Version 11, Revision 0
[ 275.861] Build Operating System: Linux Alpine Linux
[ 275.861] Current Operating System: Linux lavender 4.4.156-OniiChanKernel-R3 #2-postmarketOS SMP PREEMPT Sat Apr 11 02:50:30 UTC 2020 aarch64
[ 275.861] Kernel command line: ramoops_memreserve=4M rcupdate.rcu_expedited=1 console=ttyMSM0,115200,n8 androidboot.console=ttyMSM0 earlycon=msm_serial_dm,0xc170000 androidboot.hardware=qcom user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 sched_enable_hmp=1 sched_enable_power_aware=1 service_locator.enable=1 swiotlb=1 firmware_class.path=/vendor/firmware_mnt/image loop.max_part=7 androidboot.selinux=permissive buildvariant=eng androidboot.verifiedbootstate=orange androidboot.keymaster=1 _oot=PARTUUID=2a7f6d6d-1c23-febe-7efb-9ccfa1432ace androidboot.bootdevice=c0c4000.sdhci androidboot.serialno=ac1dde4e androidboot.cpuid=0x39148c8c androidboot.dp=0x0 androidboot.baseband=sdm mdss_mdp.panel=1:dsi:0:qcom,mdss_dsi_nt36672a_tianma_fhdplus_video:config0:1:none:cfg:single_dsi _kip_initramfs rootwait ro _nit=/init androidboot.fpsensor=fpc androidboot.secureboot=1 androidboot.hwc=Global androidboot.hwversion=1.29.0 androidboot.hwlevel=MP androidboot.hwdevice=lavender
[ 275.861] Build Date: 07 April 2020 08:22:09PM
[ 275.861]
[ 275.861] Current version of pixman: 0.38.4
[ 275.861] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 275.861] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 275.862] (==) Log file: "/var/log/Xorg.0.log", Time: Fri Feb 28 04:03:58 2020
[ 275.862] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 275.862] (==) No Layout section. Using the first Screen section.
[ 275.862] (==) No screen section available. Using defaults.
[ 275.862] (**) |-->Screen "Default Screen Section" (0)
[ 275.862] (**) | |-->Monitor "<default monitor>"
[ 275.862] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 275.862] (==) Automatically adding devices
[ 275.862] (==) Automatically enabling devices
[ 275.862] (==) Automatically adding GPU devices
[ 275.862] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 275.862] (WW) The directory "/usr/share/fonts/TTF" does not exist.
[ 275.862] Entry deleted from font path.
[ 275.862] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[ 275.862] Entry deleted from font path.
[ 275.862] (==) FontPath set to:
/usr/share/fonts/misc,
/usr/share/fonts/100dpi:unscaled,
/usr/share/fonts/75dpi:unscaled
[ 275.863] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 275.863] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 275.863] (II) Module ABI versions:
[ 275.863] X.Org ANSI C Emulation: 0.4
[ 275.863] X.Org Video Driver: 24.1
[ 275.863] X.Org XInput driver : 24.1
[ 275.863] X.Org Server Extension : 10.0
[ 275.863] (II) no primary bus or device found
[ 275.863] (II) LoadModule: "glx"
[ 275.863] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 275.865] (II) Module glx: vendor="X.Org Foundation"
[ 275.865] compiled for 1.20.8, module version = 1.0.0
[ 275.865] ABI class: X.Org Server Extension, version 10.0
[ 275.866] (==) Matched modesetting as autoconfigured driver 0
[ 275.866] (==) Matched fbdev as autoconfigured driver 1
[ 275.866] (==) Assigned the driver to the xf86ConfigLayout
[ 275.866] (II) LoadModule: "modesetting"
[ 275.866] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 275.866] (II) Module modesetting: vendor="X.Org Foundation"
[ 275.866] compiled for 1.20.8, module version = 1.20.8
[ 275.866] Module class: X.Org Video Driver
[ 275.866] ABI class: X.Org Video Driver, version 24.1
[ 275.866] (II) LoadModule: "fbdev"
[ 275.867] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[ 275.867] (II) Module fbdev: vendor="X.Org Foundation"
[ 275.867] compiled for 1.20.0, module version = 0.5.0
[ 275.867] Module class: X.Org Video Driver
[ 275.867] ABI class: X.Org Video Driver, version 24.0
[ 275.867] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 275.867] (II) FBDEV: driver for framebuffer: fbdev
[ 275.867] (++) using VT number 7
[ 275.867] (WW) Falling back to old probe method for modesetting
[ 275.867] (EE) open /dev/dri/card0: No such file or directory
[ 275.867] (WW) Falling back to old probe method for fbdev
[ 275.867] (II) Loading sub module "fbdevhw"
[ 275.867] (II) LoadModule: "fbdevhw"
[ 275.867] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 275.867] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 275.867] compiled for 1.20.8, module version = 0.0.2
[ 275.867] ABI class: X.Org Video Driver, version 24.1
[ 275.867] (II) FBDEV(0): using default device
[ 275.867] (II) FBDEV(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[ 275.867] (==) FBDEV(0): Depth 24, (==) framebuffer bpp 32
[ 275.867] (==) FBDEV(0): RGB weight 888
[ 275.867] (==) FBDEV(0): Default visual is TrueColor
[ 275.867] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0)
[ 275.867] (II) FBDEV(0): hardware: mdssfb_80000 (video memory: 19896kB)
[ 275.867] (DB) xf86MergeOutputClassOptions unsupported bus type 0
[ 275.867] (II) FBDEV(0): checking modes against framebuffer device...
[ 275.867] (II) FBDEV(0): checking modes against monitor...
[ 275.868] (II) FBDEV(0): Virtual size is 1080x2340 (pitch 1080)
[ 275.868] (**) FBDEV(0): Built-in mode "current": 183.0 MHz, 141.7 kHz, 60.0 Hz
[ 275.868] (II) FBDEV(0): Modeline "current"x0.0 183.05 1080 1170 1172 1292 2340 2340 2343 2361 -hsync -vsync -csync (141.7 kHz b)
[ 275.868] (==) FBDEV(0): DPI set to (96, 96)
[ 275.868] (II) Loading sub module "fb"
[ 275.868] (II) LoadModule: "fb"
[ 275.868] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 275.868] (II) Module fb: vendor="X.Org Foundation"
[ 275.868] compiled for 1.20.8, module version = 1.0.0
[ 275.868] ABI class: X.Org ANSI C Emulation, version 0.4
[ 275.868] (**) FBDEV(0): using shadow framebuffer
[ 275.868] (II) Loading sub module "shadow"
[ 275.868] (II) LoadModule: "shadow"
[ 275.868] (II) Loading /usr/lib/xorg/modules/libshadow.so
[ 275.868] (EE) Failed to load /usr/lib/xorg/modules/libshadow.so: Error loading shared library libfb.so: No such file or directory (needed by /usr/lib/xorg/modules/libshadow.so)
[ 275.868] (EE) FBDEV: Failed to load module "shadow" (loader failed, 0)
[ 275.868] (EE) Segmentation fault at address 0x0
[ 275.868] (EE)
Fatal server error:
[ 275.869] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 275.869] (EE)
[ 275.869] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 275.869] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 275.869] (EE)
[ 275.869] (EE) Server terminated with error (1). Closing log file.
also more details https://gitlab.com/postmarketOS/pmaports/-/merge_requests/1142#note_322017547