After rpi-update, I can see the "Under-voltage" sign in my composite screen. But screen is Black and desktop not see.
vnc says
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7月 03 09:06:01 raspberrypi vncserver-x11[489]: ServerManager: Server started
7月 03 09:06:02 raspberrypi vncserver-x11[489]: ConsoleDisplay: Cannot find a running X server on vt1
7月 03 09:06:02 raspberrypi vncserver-x11[489]: ConsoleDisplay: Found running X server (pid=663, binary=/usr/lib/xorg/Xorg)
7月 03 09:06:06 raspberrypi vncserver-x11[489]: Connections: connected: 192.168.11.194::44552 (TCP)
7月 03 09:06:06 raspberrypi vncserver-x11[489]: session started: user pi permissions f
7月 03 09:06:06 raspberrypi vncserver-x11[489]: Connections: authenticated: 192.168.11.194::44552 (TCP), as pi (f permissions)
7月 03 09:06:07 raspberrypi vncserver-x11[489]: AgentInitCheck: no response from agent
7月 03 09:06:12 raspberrypi vncserver-x11[489]: Agent: SServerAgent: Unknown parameter 'UseXFixes'
7月 03 09:06:12 raspberrypi vncserver-x11[489]: Agent: SServerAgent: Unknown parameter 'CaptureMethod'
7月 03 09:09:47 raspberrypi vncserver-x11[489]: AgentInitCheck: agent comms failure
7月 03 09:09:52 raspberrypi vncserver-x11[489]: AgentInitCheck: no response from agent
/var/log/Xorg.0.log
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[ 16.312]
X.Org X Server 1.20.4
X Protocol Version 11, Revision 0
[ 16.312] Build Operating System: Linux 4.15.0-48-generic armv8l Raspbian
[ 16.312] Current Operating System: Linux raspberrypi 4.19.56-v7+ #1242 SMP Wed Jun 26 17:31:47 BST 2019 armv7l
[ 16.312] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 bcm2708_fb.fbwidth=640 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=PARTUUID=afa6b674-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[ 16.312] Build Date: 05 June 2019 12:49:54PM
[ 16.312] xorg-server 2:1.20.4-1+rpt1 (https://www.debian.org/support)
[ 16.313] Current version of pixman: 0.36.0
[ 16.313] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 16.313] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 16.313] (==) Log file: "/var/log/Xorg.0.log", Time: Wed Jul 3 09:06:01 2019
[ 16.325] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 16.366] (==) No Layout section. Using the first Screen section.
[ 16.366] (==) No screen section available. Using defaults.
[ 16.366] (**) |-->Screen "Default Screen Section" (0)
[ 16.366] (**) | |-->Monitor "<default monitor>"
[ 16.383] (==) No device specified for screen "Default Screen Section".
Using the first device section listed.
[ 16.384] (**) | |-->Device "Allwinner A10/A13 FBDEV"
[ 16.384] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 16.384] (==) Automatically adding devices
[ 16.384] (==) Automatically enabling devices
[ 16.384] (==) Automatically adding GPU devices
[ 16.384] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 16.384] (WW) The directory "/usr/share/fonts/X11/misc" does not exist.
[ 16.384] Entry deleted from font path.
[ 16.384] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 16.384] Entry deleted from font path.
[ 16.384] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[ 16.384] Entry deleted from font path.
[ 16.384] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[ 16.384] Entry deleted from font path.
[ 16.384] (WW) The directory "/usr/share/fonts/X11/Type1" does not exist.
[ 16.385] Entry deleted from font path.
[ 16.385] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[ 16.385] Entry deleted from font path.
[ 16.385] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[ 16.385] Entry deleted from font path.
[ 16.385] (==) FontPath set to:
built-ins
[ 16.385] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 16.385] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 16.385] (II) Loader magic: 0x1fcf80
[ 16.385] (II) Module ABI versions:
[ 16.385] X.Org ANSI C Emulation: 0.4
[ 16.385] X.Org Video Driver: 24.0
[ 16.385] X.Org XInput driver : 24.1
[ 16.385] X.Org Server Extension : 10.0
[ 16.389] (++) using VT number 7
[ 16.390] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[ 16.391] (II) no primary bus or device found
[ 16.391] (II) LoadModule: "glx"
[ 16.481] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 17.037] (II) Module glx: vendor="X.Org Foundation"
[ 17.037] compiled for 1.20.4, module version = 1.0.0
[ 17.037] ABI class: X.Org Server Extension, version 10.0
[ 17.037] (II) LoadModule: "fbturbo"
[ 17.038] (II) Loading /usr/lib/xorg/modules/drivers/fbturbo_drv.so
[ 17.081] (II) Module fbturbo: vendor="X.Org Foundation"
[ 17.081] compiled for 1.20.3, module version = 0.5.1
[ 17.081] Module class: X.Org Video Driver
[ 17.081] ABI class: X.Org Video Driver, version 24.0
[ 17.081] (II) FBTURBO: driver for framebuffer: fbturbo
[ 17.092] (WW) Falling back to old probe method for fbturbo
[ 17.093] (II) Loading sub module "fbdevhw"
[ 17.093] (II) LoadModule: "fbdevhw"
[ 17.094] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 17.115] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 17.115] compiled for 1.20.4, module version = 0.0.2
[ 17.116] ABI class: X.Org Video Driver, version 24.0
[ 17.116] (II) FBTURBO(0): using /dev/fb0
[ 17.116] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 17.117] (II) FBTURBO(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[ 17.117] (==) FBTURBO(0): Depth 24, (==) framebuffer bpp 32
[ 17.117] (==) FBTURBO(0): RGB weight 888
[ 17.117] (==) FBTURBO(0): Default visual is TrueColor
[ 17.117] (==) FBTURBO(0): Using gamma correction (1.0, 1.0, 1.0)
[ 17.117] (II) FBTURBO(0): hardware: BCM2708 FB (video memory: 1200kB)
[ 17.117] (DB) xf86MergeOutputClassOptions unsupported bus type 0
[ 17.117] (**) FBTURBO(0): Option "fbdev" "/dev/fb0"
[ 17.117] (**) FBTURBO(0): Option "SwapbuffersWait" "true"
[ 17.118] (II) FBTURBO(0): processor: Unknown
[ 17.118] (II) FBTURBO(0): checking modes against framebuffer device...
[ 17.118] (II) FBTURBO(0): checking modes against monitor...
[ 17.118] (II) FBTURBO(0): Virtual size is 640x480 (pitch 640)
[ 17.118] (**) FBTURBO(0): Built-in mode "current"
[ 17.119] (==) FBTURBO(0): DPI set to (96, 96)
[ 17.119] (II) Loading sub module "fb"
[ 17.119] (II) LoadModule: "fb"
[ 17.119] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 17.144] (II) Module fb: vendor="X.Org Foundation"
[ 17.145] compiled for 1.20.4, module version = 1.0.0
[ 17.145] ABI class: X.Org ANSI C Emulation, version 0.4
[ 17.217] (II) FBTURBO(0): using backing store heuristics
[ 17.238] (II) FBTURBO(0): can't load 'g2d_23' kernel module
[ 17.238] (II) FBTURBO(0): failed to enable the use of sunxi display controller
[ 17.238] (II) FBTURBO(0): No sunxi-g2d hardware detected (check /dev/disp and /dev/g2d)
[ 17.238] (II) FBTURBO(0): G2D hardware acceleration can't be enabled
[ 17.238] (II) FBTURBO(0): enabled fbdev copyarea acceleration
[ 17.239] (==) FBTURBO(0): Backing store enabled
[ 17.292] (==) FBTURBO(0): DPMS enabled
[ 17.292] (II) FBTURBO(0): failed to enable hardware cursor
[ 17.292] (II) FBTURBO(0): no 3D acceleration because the driver has been compiled without libUMP
[ 17.292] (II) FBTURBO(0): if this is wrong and needs to be fixed, please check ./configure log
[ 17.300] (II) Initializing extension Generic Event Extension
[ 17.302] (II) Initializing extension SHAPE
[ 17.305] (II) Initializing extension MIT-SHM
[ 17.307] (II) Initializing extension XInputExtension
[ 17.320] (II) Initializing extension XTEST
[ 17.322] (II) Initializing extension BIG-REQUESTS
[ 17.324] (II) Initializing extension SYNC
[ 17.329] (II) Initializing extension XKEYBOARD
[ 17.332] (II) Initializing extension XC-MISC
[ 17.335] (II) Initializing extension SECURITY
[ 17.338] (II) Initializing extension XFIXES
[ 17.340] (II) Initializing extension RENDER
[ 17.343] (II) Initializing extension RANDR
[ 17.348] (II) Initializing extension COMPOSITE
[ 17.359] (II) Initializing extension DAMAGE
[ 17.361] (II) Initializing extension MIT-SCREEN-SAVER
[ 17.363] (II) Initializing extension DOUBLE-BUFFER
[ 17.365] (II) Initializing extension RECORD
[ 17.366] (II) Initializing extension DPMS
[ 17.368] (II) Initializing extension Present
[ 17.370] (II) Initializing extension DRI3
[ 17.370] (II) Initializing extension X-Resource
[ 17.372] (II) Initializing extension XVideo
[ 17.374] (II) Initializing extension XVideo-MotionCompensation
[ 17.374] (II) Initializing extension SELinux
[ 17.374] (II) SELinux: Disabled on system
[ 17.374] (II) Initializing extension GLX
[ 17.376] (II) AIGLX: Screen 0 is not DRI2 capable
[ 21.406] (II) IGLX: Loaded and initialized swrast
[ 21.407] (II) GLX: Initialized DRISWRAST GL provider for screen 0
[ 21.407] (II) Initializing extension XFree86-VidModeExtension
[ 21.409] (II) Initializing extension XFree86-DGA
[ 21.411] (II) Initializing extension XFree86-DRI
[ 21.417] (II) Initializing extension DRI2
[ 21.857] (II) config/udev: Adding input device (unnamed) (/dev/input/event0)
[ 21.857] (**) (unnamed): Applying InputClass "libinput keyboard catchall"
[ 21.857] (II) LoadModule: "libinput"
[ 21.858] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so
[ 22.012] (II) Module libinput: vendor="X.Org Foundation"
[ 22.012] compiled for 1.20.3, module version = 0.28.2
[ 22.012] Module class: X.Org XInput Driver
[ 22.013] ABI class: X.Org XInput driver, version 24.1
[ 22.013] (II) Using input driver 'libinput' for '(unnamed)'
[ 22.013] (**) (unnamed): always reports core events
[ 22.013] (**) Option "Device" "/dev/input/event0"
[ 22.013] (**) Option "_source" "server/udev"
[ 22.120] (EE) client bug: Invalid path /dev/input/event0
[ 22.121] (EE) libinput: (unnamed): Failed to create a device for /dev/input/event0
[ 22.123] (EE) PreInit returned 2 for "(unnamed)"
[ 22.124] (II) UnloadModule: "libinput"
[ 22.477] (II) config/udev: Adding input device vnc-relpointer (/dev/input/mouse1)
[ 22.477] (II) No input driver specified, ignoring this device.
[ 22.477] (II) This device may have been added with another device file.
[ 22.554] (II) config/udev: Adding input device vnc-relpointer (/dev/input/event2)
[ 22.554] (**) vnc-relpointer: Applying InputClass "libinput pointer catchall"
[ 22.554] (II) Using input driver 'libinput' for 'vnc-relpointer'
[ 22.554] (**) vnc-relpointer: always reports core events
[ 22.554] (**) Option "Device" "/dev/input/event2"
[ 22.554] (**) Option "_source" "server/udev"
[ 22.562] (EE) client bug: Invalid path /dev/input/event2
[ 22.562] (EE) libinput: vnc-relpointer: Failed to create a device for /dev/input/event2
[ 22.564] (EE) PreInit returned 2 for "vnc-relpointer"
[ 22.564] (II) UnloadModule: "libinput"
[ 22.648] (II) config/udev: Adding input device vnc-abspointer (/dev/input/mouse0)
[ 22.648] (II) No input driver specified, ignoring this device.
[ 22.648] (II) This device may have been added with another device file.
[ 22.668] (II) config/udev: Adding input device vnc-keyboard (/dev/input/event0)
[ 22.668] (**) vnc-keyboard: Applying InputClass "libinput keyboard catchall"
[ 22.668] (II) Using input driver 'libinput' for 'vnc-keyboard'
[ 22.668] (**) vnc-keyboard: always reports core events
[ 22.669] (**) Option "Device" "/dev/input/event0"
[ 22.669] (**) Option "_source" "server/udev"
[ 22.691] (II) event0 - vnc-keyboard: is tagged by udev as: Keyboard
[ 22.691] (II) event0 - vnc-keyboard: device is a keyboard
[ 22.692] (II) event0 - vnc-keyboard: device removed
[ 22.730] (**) Option "config_info" "udev:/sys/devices/virtual/input/input3/event0"
[ 22.731] (II) XINPUT: Adding extended input device "vnc-keyboard" (type: KEYBOARD, id 6)
[ 22.731] (**) Option "xkb_model" "pc105"
[ 22.731] (**) Option "xkb_layout" "cn"
[ 22.731] (WW) Option "xkb_variant" requires a string value
[ 22.731] (WW) Option "xkb_options" requires a string value
[ 22.930] (II) event0 - vnc-keyboard: is tagged by udev as: Keyboard
[ 22.930] (II) event0 - vnc-keyboard: device is a keyboard
[ 22.932] (II) config/udev: Adding input device (unnamed) (/dev/input/js0)
[ 22.932] (II) No input driver specified, ignoring this device.
[ 22.933] (II) This device may have been added with another device file.
[ 22.934] (II) config/udev: Adding input device (unnamed) (/dev/input/event1)
[ 22.934] (**) (unnamed): Applying InputClass "libinput pointer catchall"
[ 22.934] (II) Using input driver 'libinput' for '(unnamed)'
[ 22.934] (**) (unnamed): always reports core events
[ 22.934] (**) Option "Device" "/dev/input/event1"
[ 22.935] (**) Option "_source" "server/udev"
[ 22.935] (EE) client bug: Invalid path /dev/input/event1
[ 22.935] (EE) libinput: (unnamed): Failed to create a device for /dev/input/event1
[ 22.935] (EE) PreInit returned 2 for "(unnamed)"
[ 22.935] (II) UnloadModule: "libinput"
[ 22.965] (II) config/udev: removing device vnc-keyboard
[ 22.966] (II) event0 - vnc-keyboard: device removed
[ 23.001] (II) UnloadModule: "libinput"
[ 27.472] (II) config/udev: Adding input device vnc-abspointer (/dev/input/js0)
[ 27.473] (II) No input driver specified, ignoring this device.
[ 27.473] (II) This device may have been added with another device file.
[ 27.513] (II) config/udev: Adding input device vnc-relpointer (/dev/input/mouse1)
[ 27.513] (II) No input driver specified, ignoring this device.
[ 27.513] (II) This device may have been added with another device file.
[ 27.566] (II) config/udev: Adding input device vnc-abspointer (/dev/input/mouse0)
[ 27.566] (II) No input driver specified, ignoring this device.
[ 27.567] (II) This device may have been added with another device file.
[ 27.613] (II) config/udev: Adding input device vnc-keyboard (/dev/input/event0)
[ 27.613] (**) vnc-keyboard: Applying InputClass "libinput keyboard catchall"
[ 27.613] (II) Using input driver 'libinput' for 'vnc-keyboard'
[ 27.613] (**) vnc-keyboard: always reports core events
[ 27.613] (**) Option "Device" "/dev/input/event0"
[ 27.614] (**) Option "_source" "server/udev"
[ 27.625] (II) event0 - vnc-keyboard: is tagged by udev as: Keyboard
[ 27.625] (II) event0 - vnc-keyboard: device is a keyboard
[ 27.626] (II) event0 - vnc-keyboard: device removed
[ 27.670] (**) Option "config_info" "udev:/sys/devices/virtual/input/input6/event0"
[ 27.670] (II) XINPUT: Adding extended input device "vnc-keyboard" (type: KEYBOARD, id 6)
[ 27.670] (**) Option "xkb_model" "pc105"
[ 27.670] (**) Option "xkb_layout" "cn"
[ 27.670] (WW) Option "xkb_variant" requires a string value
[ 27.670] (WW) Option "xkb_options" requires a string value
[ 27.676] (II) event0 - vnc-keyboard: is tagged by udev as: Keyboard
[ 27.676] (II) event0 - vnc-keyboard: device is a keyboard
[ 27.679] (II) config/udev: Adding input device vnc-relpointer (/dev/input/event2)
[ 27.679] (**) vnc-relpointer: Applying InputClass "libinput pointer catchall"
[ 27.679] (II) Using input driver 'libinput' for 'vnc-relpointer'
[ 27.680] (**) vnc-relpointer: always reports core events
[ 27.680] (**) Option "Device" "/dev/input/event2"
[ 27.680] (**) Option "_source" "server/udev"
[ 27.743] (II) event2 - vnc-relpointer: is tagged by udev as: Mouse
[ 27.743] (II) event2 - vnc-relpointer: device is a pointer
[ 27.744] (II) event2 - vnc-relpointer: device removed
[ 27.841] (**) Option "config_info" "udev:/sys/devices/virtual/input/input8/event2"
[ 27.842] (II) XINPUT: Adding extended input device "vnc-relpointer" (type: MOUSE, id 7)
[ 27.843] (**) Option "AccelerationScheme" "none"
[ 27.844] (**) vnc-relpointer: (accel) selected scheme none/0
[ 27.844] (**) vnc-relpointer: (accel) acceleration factor: 2.000
[ 27.844] (**) vnc-relpointer: (accel) acceleration threshold: 4
[ 27.848] (II) event2 - vnc-relpointer: is tagged by udev as: Mouse
[ 27.849] (II) event2 - vnc-relpointer: device is a pointer
[ 27.853] (II) config/udev: Adding input device vnc-abspointer (/dev/input/event1)
[ 27.853] (**) vnc-abspointer: Applying InputClass "libinput pointer catchall"
[ 27.853] (II) Using input driver 'libinput' for 'vnc-abspointer'
[ 27.856] (**) vnc-abspointer: always reports core events
[ 27.857] (**) Option "Device" "/dev/input/event1"
[ 27.857] (**) Option "_source" "server/udev"
[ 27.862] (II) event1 - vnc-abspointer: is tagged by udev as: Mouse
[ 27.863] (II) event1 - vnc-abspointer: device is a pointer
[ 27.864] (II) event1 - vnc-abspointer: device removed
[ 27.960] (**) Option "config_info" "udev:/sys/devices/virtual/input/input7/event1"
[ 27.960] (II) XINPUT: Adding extended input device "vnc-abspointer" (type: MOUSE, id 8)
[ 27.961] (**) Option "AccelerationScheme" "none"
[ 27.961] (**) vnc-abspointer: (accel) selected scheme none/0
[ 27.961] (**) vnc-abspointer: (accel) acceleration factor: 2.000
[ 27.961] (**) vnc-abspointer: (accel) acceleration threshold: 4
[ 27.965] (II) event1 - vnc-abspointer: is tagged by udev as: Mouse
[ 27.966] (II) event1 - vnc-abspointer: device is a pointer
[ 215.803] (II) config/udev: removing device vnc-relpointer
[ 215.804] (II) event2 - vnc-relpointer: device removed
[ 215.873] (II) UnloadModule: "libinput"
[ 215.943] (II) config/udev: removing device vnc-abspointer
[ 215.944] (II) event1 - vnc-abspointer: device removed
[ 215.991] (II) UnloadModule: "libinput"
[ 216.134] (II) config/udev: removing device vnc-keyboard
[ 216.134] (II) event0 - vnc-keyboard: device removed
[ 216.201] (II) UnloadModule: "libinput"
[ 625.475] (II) FBTURBO(0): FBIOBLANK: Invalid argument (Screen blanking not supported by kernel - disabling)
if I uncomment hdmi_force_hotplug=1, hdmi and vnc works fine.