BBB, /dev/fb0 missing

Andrew46 · September 1, 2021, 2:00am

Good morning

Using: bone-debian-10.3-iot-armhf-2020-04-06-4gb.img

added lxqt

All good except /dev/fb0 missing

Ive searched extensively and cannot find a solution.

My conclusion : image built without frame buffer support OR bug
I could downgrade to an image with lxqt included: [ Debian 9.9 2019-08-03 4GB SD LXQT ]

Any assistance would be most welcome

Regards Andrew

More, i set up another SD with:
Linux beaglebone 4.14.108-ti-r113 #1 SMP PREEMPT Wed Jul 31 00:01:10 UTC 2019 armv7l GNU/Linux

ls /dev still shows no /dev/fb0

cuse mmcblk1boot1 stdout tty32 tty58 vcs1
disk mmcblk1p1 tty tty33 tty59 vcs2
dri mmcblk1p2 tty0 tty34 tty6 vcs3
fd mmcblk1rpmb tty1 tty35 tty60 vcs4
full mqueue tty10 tty36 tty61 vcs5
fuse net tty11 tty37 tty62 vcs6
gpiochip0 network_latency tty12 tty38 tty63 vcs7

This makes me think /dev/fb0 was removed quite some time ago as i have older images where /dev/fb0 is present:
Linux fft-gate-cam 3.8.13-bone40 #1 SMP Fri Jan 31 07:31:37 UTC 2014 armv7l GNU/Linux

ls /dev for my older image…
disk mmcblk0 random tty28 tty58 vcs2
dri mmcblk0p1 root tty29 tty59 vcs3
dsp mmcblk0p2 rtc0 tty3 tty6 vcs4
fb0 mmcblk1 sda tty30 tty60 vcs5
fd mmcblk1boot0 sda1 tty31 tty61 vcs6
full mmcblk1boot1 shm tty32 tty62 vcs7
fuse mmcblk1p1 snd tty33 tty63 vcsa
hidraw0 mmcblk1p2 sndstat tty34 tty7 vcsa1
hidraw1 mqueue stderr tty35 tty8 vcsa2
i2c-0 net stdin tty36 tty9 vcsa3
i2c-1 network_latency stdout tty37 ttyGS0 vcsa4

RobertCNelson · September 1, 2021, 1:36pm

Well, it’s enabled:

github.com

RobertCNelson/ti-linux-kernel-dev/blob/ti-linux-4.14.y/patches/defconfig#L3966

    
      
          # Graphics support
          #
          # CONFIG_IMX_IPUV3_CORE is not set
          CONFIG_DRM=y
          CONFIG_DRM_MIPI_DSI=y
          # CONFIG_DRM_DP_AUX_CHARDEV is not set
          # CONFIG_DRM_DEBUG_MM is not set
          # CONFIG_DRM_DEBUG_MM_SELFTEST is not set
          CONFIG_DRM_KMS_HELPER=y
          CONFIG_DRM_KMS_FB_HELPER=y
          CONFIG_DRM_FBDEV_EMULATION=y
          CONFIG_DRM_FBDEV_OVERALLOC=100
          CONFIG_DRM_LOAD_EDID_FIRMWARE=y
          CONFIG_DRM_GEM_CMA_HELPER=y
          CONFIG_DRM_KMS_CMA_HELPER=y
          CONFIG_DRM_VM=y
          
          
#
          # I2C encoder or helper chips
          #
          CONFIG_DRM_I2C_ADIHDMI=y

and

github.com

RobertCNelson/ti-linux-kernel-dev/blob/ti-linux-4.14.y/patches/defconfig#L4089

    
      
          CONFIG_TINYDRM_REPAPER=m
          CONFIG_TINYDRM_ST7586=m
          # CONFIG_DRM_PL111 is not set
          # CONFIG_DRM_TIDSS is not set
          CONFIG_DRM_LEGACY=y
          # CONFIG_DRM_LIB_RANDOM is not set
          
          
#
          # Frame buffer Devices
          #
          CONFIG_FB=y
          CONFIG_FIRMWARE_EDID=y
          CONFIG_FB_CMDLINE=y
          CONFIG_FB_NOTIFY=y
          # CONFIG_FB_DDC is not set
          # CONFIG_FB_BOOT_VESA_SUPPORT is not set
          CONFIG_FB_CFB_FILLRECT=y
          CONFIG_FB_CFB_COPYAREA=y
          CONFIG_FB_CFB_IMAGEBLIT=y
          # CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set
          CONFIG_FB_SYS_FILLRECT=y

Regards,

LucaVS · September 19, 2022, 2:28pm

Hi,
I just flashed the same image:
https://debian.beagleboard.org/images/bone-debian-10.3-iot-armhf-2020-04-06-4gb.img.xz

and it seems I have same problem: no /dev/fb0 .
Is there some setting I should check?

Thanks

LucaVS · September 19, 2022, 2:28pm

Same problem using:
bone-debian-10.0-iot-armhf-2019-07-07-4gb.img.xz
no /dev/fb0

While I confirm it’s available on:
https://debian.beagleboard.org/images/bone-debian-9.9-iot-armhf-2019-08-03-4gb.img.xz

I think it’s something related to Debian 10 releases.

Andrew46 · October 6, 2022, 9:26am

Good evening
I have no proper solution, I reverted the OS to an earlier version to maintain the functionality I wanted.
How /dev/fb0 gets deleted is not being addressed.

Regards, Andrew