Touchscreen stopped working, error: ENOENT: no such file or directory, stat '/tmp/.X11-unix/X'

volumio@hifiberry:~$ cat /usr/share/X11/xorg.conf.d/99-fbturbo.conf

This is a minimal sample config file, which can be copied to

/etc/X11/xorg.conf in order to make the Xorg server pick up

and load xf86-video-fbturbo driver installed in the system.

When troubleshooting, check /var/log/Xorg.0.log for the debugging

output and error messages.

#The driver is made by Waveshare&Spotpear

Run “man fbturbo” to get additional information about the extra

configuration options for tuning the driver.

Section “Device”
Identifier “Allwinner A10/A13 FBDEV”
Driver “fbdev”
Option “fbdev” “/dev/fb0”

    Option          "SwapbuffersWait" "true"

EndSection
volumio@hifiberry:~$ cat /var/log/Xorg.0.log
[ 47.979]
X.Org X Server 1.20.4
X Protocol Version 11, Revision 0
[ 47.979] Build Operating System: Linux 5.4.0-72-generic armv8l Raspbian
[ 47.980] Current Operating System: Linux hifiberry 5.10.92-v7+ #1514 SMP Mon Jan 17 17:36:39 GMT 2022 armv7l
[ 47.980] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=640 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 splash plymouth.ignore-serial-consoles dwc_otg.fiq_enable=1 dwc_otg.fiq_fsm_enable=1 dwc_otg.fiq_fsm_mask=0xF dwc_otg.nak_holdoff=1 quiet console=ttyS0,115200 console=tty1 imgpart=/dev/mmcblk0p2 imgfile=/volumio_current.sqsh rootwait bootdelay=5 elevator=noop logo.nologo vt.global_cursor_default=0 net.ifnames=0 snd-bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 loglevel=0
[ 47.981] Build Date: 04 January 2022 10:05:34AM
[ 47.981] xorg-server 2:1.20.4-1+rpt4+deb10u4 (Debian -- Support)
[ 47.981] Current version of pixman: 0.36.0
[ 47.981] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 47.981] Markers: (–) probed, () from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 47.983] (==) Log file: “/var/log/Xorg.0.log”, Time: Fri Apr 8 21:42:39 2022
[ 47.992] (==) Using config directory: “/etc/X11/xorg.conf.d”
[ 47.992] (==) Using system config directory “/usr/share/X11/xorg.conf.d”
[ 48.001] (==) No Layout section. Using the first Screen section.
[ 48.001] (==) No screen section available. Using defaults.
[ 48.001] (
) |–>Screen “Default Screen Section” (0)
[ 48.001] () | |–>Monitor “”
[ 48.008] (==) No device specified for screen “Default Screen Section”.
Using the first device section listed.
[ 48.008] (
) | |–>Device “Allwinner A10/A13 FBDEV”
[ 48.008] (==) No monitor specified for screen “Default Screen Section”.
Using a default monitor configuration.
[ 48.008] (==) Automatically adding devices
[ 48.008] (==) Automatically enabling devices
[ 48.008] (==) Automatically adding GPU devices
[ 48.015] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 48.016] (WW) The directory “/usr/share/fonts/X11/cyrillic” does not exist.
[ 48.016] Entry deleted from font path.
[ 48.018] (==) FontPath set to:
/usr/share/fonts/X11/misc,
/usr/share/fonts/X11/100dpi/:unscaled,
/usr/share/fonts/X11/75dpi/:unscaled,
/usr/share/fonts/X11/Type1,
/usr/share/fonts/X11/100dpi,
/usr/share/fonts/X11/75dpi,
built-ins
[ 48.018] (==) ModulePath set to “/usr/lib/xorg/modules”
[ 48.018] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 48.018] (II) Loader magic: 0x1fdf80
[ 48.018] (II) Module ABI versions:
[ 48.018] X.Org ANSI C Emulation: 0.4
[ 48.018] X.Org Video Driver: 24.0
[ 48.018] X.Org XInput driver : 24.1
[ 48.018] X.Org Server Extension : 10.0
[ 48.020] (–) using VT number 2

[ 48.021] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[ 48.021] (II) no primary bus or device found
[ 48.021] (II) LoadModule: “glx”
[ 48.023] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 48.091] (II) Module glx: vendor=“X.Org Foundation”
[ 48.092] compiled for 1.20.4, module version = 1.0.0
[ 48.092] ABI class: X.Org Server Extension, version 10.0
[ 48.092] (II) LoadModule: “fbdev”
[ 48.094] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[ 48.097] (II) Module fbdev: vendor=“X.Org Foundation”
[ 48.097] compiled for 1.20.3, module version = 0.5.0
[ 48.097] Module class: X.Org Video Driver
[ 48.097] ABI class: X.Org Video Driver, version 24.0
[ 48.097] (II) FBDEV: driver for framebuffer: fbdev
[ 48.100] (WW) Falling back to old probe method for fbdev
[ 48.100] (II) Loading sub module “fbdevhw”
[ 48.100] (II) LoadModule: “fbdevhw”
[ 48.100] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 48.103] (II) Module fbdevhw: vendor=“X.Org Foundation”
[ 48.103] compiled for 1.20.4, module version = 0.0.2
[ 48.103] ABI class: X.Org Video Driver, version 24.0
[ 48.103] (II) FBDEV(0): using /dev/fb0
[ 48.103] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 48.103] (II) FBDEV(0): Creating default Display subsection in Screen section
“Default Screen Section” for depth/fbbpp 24/32
[ 48.103] (==) FBDEV(0): Depth 24, (==) framebuffer bpp 32
[ 48.103] (==) FBDEV(0): RGB weight 888
[ 48.103] (==) FBDEV(0): Default visual is TrueColor
[ 48.103] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0)
[ 48.103] (II) FBDEV(0): hardware: BCM2708 FB (video memory: 1200kB)
[ 48.103] (DB) xf86MergeOutputClassOptions unsupported bus type 0
[ 48.103] () FBDEV(0): Option “fbdev” “/dev/fb0”
[ 48.103] (II) FBDEV(0): checking modes against framebuffer device…
[ 48.103] (II) FBDEV(0): checking modes against monitor…
[ 48.103] (II) FBDEV(0): Virtual size is 640x480 (pitch 640)
[ 48.103] (
) FBDEV(0): Built-in mode “current”
[ 48.103] (==) FBDEV(0): DPI set to (96, 96)
[ 48.103] (II) Loading sub module “fb”
[ 48.103] (II) LoadModule: “fb”
[ 48.104] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 48.110] (II) Module fb: vendor=“X.Org Foundation”
[ 48.110] compiled for 1.20.4, module version = 1.0.0
[ 48.110] ABI class: X.Org ANSI C Emulation, version 0.4
[ 48.110] (**) FBDEV(0): using shadow framebuffer
[ 48.110] (II) Loading sub module “shadow”
[ 48.110] (II) LoadModule: “shadow”
[ 48.110] (II) Loading /usr/lib/xorg/modules/libshadow.so
[ 48.113] (II) Module shadow: vendor=“X.Org Foundation”
[ 48.114] compiled for 1.20.4, module version = 1.1.0
[ 48.114] ABI class: X.Org ANSI C Emulation, version 0.4
[ 48.137] (==) FBDEV(0): Backing store enabled
[ 48.142] (==) FBDEV(0): DPMS enabled
[ 48.144] (II) Initializing extension Generic Event Extension
[ 48.145] (II) Initializing extension SHAPE
[ 48.146] (II) Initializing extension MIT-SHM
[ 48.147] (II) Initializing extension XInputExtension
[ 48.151] (II) Initializing extension XTEST
[ 48.152] (II) Initializing extension BIG-REQUESTS
[ 48.153] (II) Initializing extension SYNC
[ 48.154] (II) Initializing extension XKEYBOARD
[ 48.155] (II) Initializing extension XC-MISC
[ 48.156] (II) Initializing extension SECURITY
[ 48.157] (II) Initializing extension XFIXES
[ 48.158] (II) Initializing extension RENDER
[ 48.159] (II) Initializing extension RANDR
[ 48.161] (II) Initializing extension COMPOSITE
[ 48.164] (II) Initializing extension DAMAGE
[ 48.165] (II) Initializing extension MIT-SCREEN-SAVER
[ 48.166] (II) Initializing extension DOUBLE-BUFFER
[ 48.167] (II) Initializing extension RECORD
[ 48.168] (II) Initializing extension DPMS
[ 48.169] (II) Initializing extension Present
[ 48.170] (II) Initializing extension DRI3
[ 48.170] (II) Initializing extension X-Resource
[ 48.171] (II) Initializing extension XVideo
[ 48.172] (II) Initializing extension XVideo-MotionCompensation
[ 48.172] (II) Initializing extension SELinux
[ 48.172] (II) SELinux: Disabled on system
[ 48.172] (II) Initializing extension GLX
[ 48.173] (II) AIGLX: Screen 0 is not DRI2 capable
[ 49.499] (II) IGLX: Loaded and initialized swrast
[ 49.499] (II) GLX: Initialized DRISWRAST GL provider for screen 0
[ 49.499] (II) Initializing extension XFree86-VidModeExtension
[ 49.500] (II) Initializing extension XFree86-DGA
[ 49.501] (II) Initializing extension XFree86-DRI
[ 49.504] (II) Initializing extension DRI2

Execute

sudo sed 's/fb0/fb1/' -i /usr/share/X11/xorg.conf.d/99-fbturbo.conf

Then reboot.

hat leider nichts gebracht

Please post the result of

ls -al /dev/fb*

ls -al /dev/fb*
crw-rw---- 1 root video 29, 0 Apr 8 22:29 /dev/fb0

Hm, it seems you need to revert the change from post #40 then:

sudo sed 's/fb1/fb0' -i /usr/share/X11/xorg.conf.d/99-fbturbo.conf

This is weird, as per this thread I would have expected that your screen uses fb1 and not fb0… Sorry for asking, but want to make sure: Is your screen an original Waveshare 35b and also V2? And is it the only screen connected to your Pi?

Yes the only screen.
bought here

Do you have the printing “Rev2.0” on the screen’s PCB?

yes

I am wondering why

are set to 640 and 480 when the resolution of the display is 480 x 320…

Please post the results of

cat /boot/config.txt

cat /boot/userconfig.txt

and

cat /boot/cmdline.txt

I’m sorry

cat /boot/config.txt
initramfs volumio.initrd
gpu_mem=32
max_usb_current=1
dtparam=audio=on
audio_pwm_mode=2
dtparam=i2c_arm=on
disable_splash=1
hdmi_force_hotplug=1
force_eeprom_read=0

include userconfig.txt

Volumio i2s setting below: do not alter

dtoverlay=hifiberry-dacplus

cat /boot/userconfig.txt

dtparam=spi=on
dtoverlay=waveshare35b-v2

cat /boot/cmdline.txt
splash plymouth.ignore-serial-consoles dwc_otg.fiq_enable=1 dwc_otg.fiq_fsm_enable=1 dwc_otg.fiq_fsm_mask=0xF dwc_otg.nak_holdoff=1 quiet console=serial0,115200 console=tty1 imgpart=/dev/mmcblk0p2 imgfile=/volumio_current.sqsh rootwait bootdelay=5 elevator=noop logo.nologo vt.global_cursor_default=0 net.ifnames=0 snd-bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 loglevel=0

Looks ok. Since you are using a Hifiberry (?) DAC Amp 2: Did you check if the GPIO pins used by the DAC Amp 2 interfere with the ones used by the screen?

yes it is plugged into the pins.
sorry i’ll try again later, my eyes close.
good night

After having a look at Hifiberry’s page I think the DAC doesn’t cause the problem as it doesn’t use GPIO needed by the display.

Please check what happens if you remove “99-fbturbo.conf” from “/usr/share/X11/xorg.conf.d”. After a reboot please execute

cat /var/log/Xorg.0.log

once again and post the result.

Apart from that:

Is the backlight of your display on?

Is something displayed during Volumio’s boot process?

yes backlight is on, no nothing displayed during boot.
volumio@hifiberry:~$ cat /var/log/Xorg.0.log
[ 48.244]
X.Org X Server 1.20.4
X Protocol Version 11, Revision 0
[ 48.244] Build Operating System: Linux 5.4.0-72-generic armv8l Raspbian
[ 48.244] Current Operating System: Linux hifiberry 5.10.92-v7+ #1514 SMP Mon Jan 17 17:36:39 GMT 2022 armv7l
[ 48.244] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=640 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 splash plymouth.ignore-serial-consoles dwc_otg.fiq_enable=1 dwc_otg.fiq_fsm_enable=1 dwc_otg.fiq_fsm_mask=0xF dwc_otg.nak_holdoff=1 quiet console=ttyS0,115200 console=tty1 imgpart=/dev/mmcblk0p2 imgfile=/volumio_current.sqsh rootwait bootdelay=5 elevator=noop logo.nologo vt.global_cursor_default=0 net.ifnames=0 snd-bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 loglevel=0
[ 48.244] Build Date: 04 January 2022 10:05:34AM
[ 48.244] xorg-server 2:1.20.4-1+rpt4+deb10u4 (Debian -- Support)
[ 48.244] Current version of pixman: 0.36.0
[ 48.244] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 48.244] Markers: (–) probed, () from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 48.245] (==) Log file: “/var/log/Xorg.0.log”, Time: Sat Apr 9 16:28:07 2022
[ 48.257] (==) Using config directory: “/etc/X11/xorg.conf.d”
[ 48.257] (==) Using system config directory “/usr/share/X11/xorg.conf.d”
[ 48.265] (==) No Layout section. Using the first Screen section.
[ 48.265] (==) No screen section available. Using defaults.
[ 48.265] (
) |–>Screen “Default Screen Section” (0)
[ 48.265] (**) | |–>Monitor “”
[ 48.272] (==) No monitor specified for screen “Default Screen Section”.
Using a default monitor configuration.
[ 48.272] (==) Automatically adding devices
[ 48.272] (==) Automatically enabling devices
[ 48.272] (==) Automatically adding GPU devices
[ 48.279] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 48.280] (WW) The directory “/usr/share/fonts/X11/cyrillic” does not exist.
[ 48.280] Entry deleted from font path.
[ 48.282] (==) FontPath set to:
/usr/share/fonts/X11/misc,
/usr/share/fonts/X11/100dpi/:unscaled,
/usr/share/fonts/X11/75dpi/:unscaled,
/usr/share/fonts/X11/Type1,
/usr/share/fonts/X11/100dpi,
/usr/share/fonts/X11/75dpi,
built-ins
[ 48.282] (==) ModulePath set to “/usr/lib/xorg/modules”
[ 48.282] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 48.282] (II) Loader magic: 0x1fdf80
[ 48.282] (II) Module ABI versions:
[ 48.283] X.Org ANSI C Emulation: 0.4
[ 48.283] X.Org Video Driver: 24.0
[ 48.283] X.Org XInput driver : 24.1
[ 48.283] X.Org Server Extension : 10.0
[ 48.285] (–) using VT number 2

[ 48.285] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[ 48.286] (II) no primary bus or device found
[ 48.286] (II) LoadModule: “glx”
[ 48.288] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 48.354] (II) Module glx: vendor=“X.Org Foundation”
[ 48.354] compiled for 1.20.4, module version = 1.0.0
[ 48.354] ABI class: X.Org Server Extension, version 10.0
[ 48.355] (==) Matched modesetting as autoconfigured driver 0
[ 48.355] (==) Matched fbdev as autoconfigured driver 1
[ 48.355] (==) Assigned the driver to the xf86ConfigLayout
[ 48.355] (II) LoadModule: “modesetting”
[ 48.358] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 48.365] (II) Module modesetting: vendor=“X.Org Foundation”
[ 48.365] compiled for 1.20.4, module version = 1.20.4
[ 48.365] Module class: X.Org Video Driver
[ 48.365] ABI class: X.Org Video Driver, version 24.0
[ 48.365] (II) LoadModule: “fbdev”
[ 48.366] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[ 48.369] (II) Module fbdev: vendor=“X.Org Foundation”
[ 48.369] compiled for 1.20.3, module version = 0.5.0
[ 48.369] Module class: X.Org Video Driver
[ 48.369] ABI class: X.Org Video Driver, version 24.0
[ 48.369] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 48.369] (II) FBDEV: driver for framebuffer: fbdev
[ 48.373] (WW) Falling back to old probe method for modesetting
[ 48.373] (EE) open /dev/dri/card0: No such file or directory
[ 48.373] (WW) Falling back to old probe method for fbdev
[ 48.373] (II) Loading sub module “fbdevhw”
[ 48.373] (II) LoadModule: “fbdevhw”
[ 48.373] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 48.376] (II) Module fbdevhw: vendor=“X.Org Foundation”
[ 48.376] compiled for 1.20.4, module version = 0.0.2
[ 48.376] ABI class: X.Org Video Driver, version 24.0
[ 48.376] (II) FBDEV(0): using default device
[ 48.376] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 48.376] (II) FBDEV(0): Creating default Display subsection in Screen section
“Default Screen Section” for depth/fbbpp 24/32
[ 48.376] (==) FBDEV(0): Depth 24, (==) framebuffer bpp 32
[ 48.376] (==) FBDEV(0): RGB weight 888
[ 48.376] (==) FBDEV(0): Default visual is TrueColor
[ 48.376] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0)
[ 48.376] (II) FBDEV(0): hardware: BCM2708 FB (video memory: 1200kB)
[ 48.376] (DB) xf86MergeOutputClassOptions unsupported bus type 0
[ 48.376] (II) FBDEV(0): checking modes against framebuffer device…
[ 48.376] (II) FBDEV(0): checking modes against monitor…
[ 48.376] (II) FBDEV(0): Virtual size is 640x480 (pitch 640)
[ 48.376] () FBDEV(0): Built-in mode “current”
[ 48.376] (==) FBDEV(0): DPI set to (96, 96)
[ 48.376] (II) Loading sub module “fb”
[ 48.376] (II) LoadModule: “fb”
[ 48.376] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 48.382] (II) Module fb: vendor=“X.Org Foundation”
[ 48.382] compiled for 1.20.4, module version = 1.0.0
[ 48.382] ABI class: X.Org ANSI C Emulation, version 0.4
[ 48.382] (
) FBDEV(0): using shadow framebuffer
[ 48.382] (II) Loading sub module “shadow”
[ 48.382] (II) LoadModule: “shadow”
[ 48.383] (II) Loading /usr/lib/xorg/modules/libshadow.so
[ 48.386] (II) Module shadow: vendor=“X.Org Foundation”
[ 48.386] compiled for 1.20.4, module version = 1.1.0
[ 48.386] ABI class: X.Org ANSI C Emulation, version 0.4
[ 48.386] (II) UnloadModule: “modesetting”
[ 48.386] (II) Unloading modesetting
[ 48.410] (==) FBDEV(0): Backing store enabled
[ 48.415] (==) FBDEV(0): DPMS enabled
[ 48.416] (II) Initializing extension Generic Event Extension
[ 48.417] (II) Initializing extension SHAPE
[ 48.418] (II) Initializing extension MIT-SHM
[ 48.419] (II) Initializing extension XInputExtension
[ 48.424] (II) Initializing extension XTEST
[ 48.425] (II) Initializing extension BIG-REQUESTS
[ 48.426] (II) Initializing extension SYNC
[ 48.427] (II) Initializing extension XKEYBOARD
[ 48.428] (II) Initializing extension XC-MISC
[ 48.429] (II) Initializing extension SECURITY
[ 48.430] (II) Initializing extension XFIXES
[ 48.431] (II) Initializing extension RENDER
[ 48.432] (II) Initializing extension RANDR
[ 48.434] (II) Initializing extension COMPOSITE
[ 48.436] (II) Initializing extension DAMAGE
[ 48.437] (II) Initializing extension MIT-SCREEN-SAVER
[ 48.438] (II) Initializing extension DOUBLE-BUFFER
[ 48.439] (II) Initializing extension RECORD
[ 48.440] (II) Initializing extension DPMS
[ 48.441] (II) Initializing extension Present
[ 48.442] (II) Initializing extension DRI3
[ 48.442] (II) Initializing extension X-Resource
[ 48.443] (II) Initializing extension XVideo
[ 48.444] (II) Initializing extension XVideo-MotionCompensation
[ 48.444] (II) Initializing extension SELinux
[ 48.444] (II) SELinux: Disabled on system
[ 48.444] (II) Initializing extension GLX
[ 48.445] (II) AIGLX: Screen 0 is not DRI2 capable
[ 49.772] (II) IGLX: Loaded and initialized swrast
[ 49.772] (II) GLX: Initialized DRISWRAST GL provider for screen 0
[ 49.772] (II) Initializing extension XFree86-VidModeExtension
[ 49.773] (II) Initializing extension XFree86-DGA
[ 49.774] (II) Initializing extension XFree86-DRI
[ 49.777] (II) Initializing extension DRI2

I think something is wrong with the overlay. Back in the days there have been issues with Waveshare overlays on kernel 5+, but I think these should have been solved in the meantime.

Anyhow, maybe try replacing the “waveshare-35b” entry in your “/boot/userconfig,txt” with


dtoverlay=ads7846
dtparam=cs=1
dtparam=penirq=17
dtparam=penirq_pull=2
dtparam=speed=1000000
dtparam=keep_vref_on=1
dtparam=swapxy=1
dtparam=pmax=255
dtparam=xohms=60
dtparam=xmin=200
dtparam=xmax=3900
dtparam=ymin=200
dtparam=ymax=3900

only backliht

I suggest to test the display on the same Pi running Raspberry Pi OS.

P.S. What is currently the result of

ls -al /dev/fb*

unfortunately it didn’t work with raspi os either, but the driver would have to be installed anyway.
and unfortunately i can’t download the image provided by the waveshare with installed drivers.
https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(B)

Don’t use the Waveshare image but install “standard” Raspberry Pi OS.

Before doing so, I would be interested in the output of

ls -al /dev/fb*