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7" display issues
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7" display issues

by grodey on Mon Feb 12, 2018 4:34 pm

I have the rev. C BBB and product #1667 7" HDMI monitor. The board boots normally to console with display resolution set at 1280x720. However, text is "cut off" the screen. I've loaded lxde and startx displays the desktop, but again the image is cropped above, left, and below the screen. I have read the eLinux HDMI page. The monitor menu shows a setting of HDMI= overscan, but I am unable to change this. Selecting 4:3 resolution (from 16:9) moves the image toward the center of the screen, but the text is still truncated. I replaced the fbdev device driver with xserver-xorg-video-modesetting in xorg.conf and this does allow me to change resolutions via lxde desktop, but only a setting below 640x480 was offered.

I haven't tried disabling the HDMI cape yet, as I'd like to keep audio as an option, nor have I played much with xrandr. Anyone have suggestions on how to proceed? The board does work with the 10" monitor (item #2261) at 1280x720, but I'd like to make the 7" work if possible. Thanks!!

grodey
 
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Joined: Mon Feb 12, 2018 4:11 pm

Re: 7" display issues

by drewfustini on Tue Feb 13, 2018 5:36 am

I'd like to better understand how your BeagleBone is configured. Please paste the output of these commands:

sudo /opt/scripts/tools/version.sh

cat /boot/uEnv.txt

drewfustini
 
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Re: 7" display issues

by grodey on Wed Feb 14, 2018 1:14 am

Hi, thank you,

The script "version.sh" is missing from /opt/scripts/tools/ directory in my filesystem

here is uEnv.txt:

Code: Select all | TOGGLE FULL SIZE
#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0

uname_r=3.8.13-bone79
##uuid=
#dtb=

##BeagleBone Black/Green dtb's for v4.1.x (BeagleBone White just works..)

##BeagleBone Black: HDMI (Audio/Video) disabled:
#dtb=am335x-boneblack-emmc-overlay.dtb

##BeagleBone Black: eMMC disabled:
#dtb=am335x-boneblack-hdmi-overlay.dtb

##BeagleBone Black: HDMI Audio/eMMC disabled:
#dtb=am335x-boneblack-nhdmi-overlay.dtb

##BeagleBone Black: HDMI (Audio/Video)/eMMC disabled:
#dtb=am335x-boneblack-overlay.dtb

##BeagleBone Black: wl1835
#dtb=am335x-boneblack-wl1835mod.dtb

##BeagleBone Black: replicape
#dtb=am335x-boneblack-replicape.dtb

##BeagleBone Green: eMMC disabled
#dtb=am335x-bonegreen-overlay.dtb

cmdline=coherent_pool=1M quiet init=/lib/systemd/systemd cape_universal=enable

#In the event of edid real failures, uncomment this next line:
#cmdline=coherent_pool=1M quiet init=/lib/systemd/systemd cape_universal=enable video=HDMI-A-1:1024x768@60e

##Example v3.8.x
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=

##Example v4.1.x
#cape_disable=bone_capemgr.disable_partno=
#cape_enable=bone_capemgr.enable_partno=

##Disable HDMI/eMMC (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G

##Disable HDMI (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN

##Disable eMMC (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONE-EMMC-2G

##Audio Cape (needs HDMI Audio disabled) (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONELT-HDMI
#cape_enable=capemgr.enable_partno=BB-BONE-AUDI-02


##enable Generic eMMC Flasher:
##make sure, these tools are installed: dosfstools rsync
#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh

uuid=8d05272e-b02a-431c-935d-8678f4e6e4b9

grodey
 
Posts: 11
Joined: Mon Feb 12, 2018 4:11 pm

Re: 7" display issues

by drewfustini on Wed Feb 14, 2018 1:22 am

Hi, it looks like you are using a Debian image which is quite old at this point.

I would suggest moving to a newer BeagleBoard.org Debian image:
Debian 9.3 (Stretch)
or
Debian 8.7 (Jessie)

Would you be able to try one of those?

drewfustini
 
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Joined: Sat Dec 26, 2015 1:19 pm

Re: 7" display issues

by grodey on Thu Feb 15, 2018 4:25 am

Ok, that fixed it, thank you!

grodey
 
Posts: 11
Joined: Mon Feb 12, 2018 4:11 pm

Re: 7" display issues

by grodey on Sun Feb 25, 2018 5:37 pm

Well, kind of... the display works but the system is mind-numbingly slow. I read the post about BBB vs pi performance and I'm not expecting desktop speeds, but I'd like a simple graphical interface to do web surfing at least. I have Debian 9 running LXQt 0.11.1. Is there a recommended image that gives decent performance, maybe using Gnome, LXDE? What I had initially was much faster (Debian 3.8.13), although the display didn't (quite) work. Thanks!

grodey
 
Posts: 11
Joined: Mon Feb 12, 2018 4:11 pm

Re: 7" display issues

by drewfustini on Mon Feb 26, 2018 3:45 am

I had thought Robert Nelson switched the BeagleBoard.org Debian GUI image to LXQT as it was the best trade off between size and performance. I would suggest asking about performance on the BeagleBoard.org mailing list and Robert should see it.

Also, Robert keeps a list of Debian Image Testing Snapshots that may be of interest. There are recent LXQT images for both Debian 8.x (jessie) and 9.x (stetch).

drewfustini
 
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Re: 7" display issues

by grodey on Tue Feb 27, 2018 1:21 am

Ok, thanks I will try them at that site. What are you running on your test system? Are you able to run a GUI with Firefox and load webpages with acceptable speed? Seems like something must be wrong with my current setup for it to be that slow- the console at least seems to work without glitches.

grodey
 
Posts: 11
Joined: Mon Feb 12, 2018 4:11 pm

Re: 7" display issues

by drewfustini on Wed Feb 28, 2018 12:45 am

Unfortunately, I've not used the desktop environment in a long time and always interact with the BeagleBone through ssh or serial port. I do recall in the past that using a browser was a poor experience.

The biggest use case for the graphical desktop that I know of is MachineKit. It is an image that has LinuxCNC installed and ready to control a CNC machine or a 3D printer.

You may want to try that image to see if the performance is any better:
http://www.machinekit.io/docs/getting-s ... it-images/

drewfustini
 
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Joined: Sat Dec 26, 2015 1:19 pm

Re: 7" display issues

by grodey on Wed Feb 28, 2018 8:05 pm

Ok thanks, I'll try a few of the images to see what I can get. It's certainly not essential to have a GUI for the projects I have in mind- I just assumed it would work given that it had HDMI output. Now I have a better idea of what it's capable of...

grodey
 
Posts: 11
Joined: Mon Feb 12, 2018 4:11 pm

Please be positive and constructive with your questions and comments.