But unfortunately later. I have to stay on more stable for me L2T 23.2 until all the functional parts will work together due to extremely tight development schedule.
Interesting that I have no such problem on L2T 23.2…
finally I have tried get-edid
Unfortunately, it works only with i2c and must be very useful for HDMI, but not for DSI.
This is read-edid version 3.0.1. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 1
No EDID on bus 3
No EDID on bus 4
No EDID on bus 5
No EDID on bus 6
1 potential busses found: 2
Bus 2 doesn't really have an EDID...
Couldn't find an accessible EDID on this computer.
I'm sorry nothing was successful. Maybe try some other arguments
if you played with them, or send an email to Matthew Kern <pyrophobicman@gmail.com>.
Unfortunately I do not know enough about DSI, but you are correct that EDID uses i2c query of the monitor. This is more or less a standard method in X11 for automatic discovery of what a monitor’s capabilities are (the EDID software directly fills in the correct xorg.conf info whenever the monitor is detected…X does not care that the information is in RAM from a query or if it is from a file).
X can be configured by other methods, e.g., manually adding the required details to the Xorg.conf file, or simply having a monitor which has a valid configuration at the Xorg server’s default settings (a case of coincidentally working). Unless X ends up with a configuration matching a valid monitor configuration, you will get a failure.
For your DSI monitor, somewhere is probably a publication of its specifications such that you could manually enter the “/etc/xorg.conf” values for “DSI-0”. The program “gtf” may help with this, plus there are online web-based modeline calculators such as:
[url]http://arachnoid.com/modelines/[/url]
You could compare the output of the existing xorg.conf file, the output of a working monitor which has correct EDID, and translate specifications from the DSI device into that format…editing directly into the xorg.conf.
For me the problem becomes because of changing X11. In release 23.2 it worked perfectly…
But not now. And it is very hard to understand a reason…
DSI have a negotiations inside the protocol. The Protocol is closed. We are not a member of MIPI, it is too expensive for a medium company…
If it worked before, but not now, it tends to be from a change in defaults. The prior default matched something your display could handle, the current default does not. No EDID means no automated query.
Yes, a big hinderance to building display products with any proprietary interface (which includes eDP) is the extreme cost of information (thousands of dollars) from standards publishers. One has to rely on examples of implementations without any standards being available, e.g., good data sheets on display products which use that interface for their reference implementation. I really like the USB.org system where they publish information and fees are generally for labeling instead. In many cases chips for USB implementation offer use of the chip supplier’s information if desired…no such intermediate “glue” products seem to exist for newer display protocols, though I suspect those products will slowly appear on the market.
I’ve returned back to the original motherboard just to check the difference in behavior between the original and our own carrier boards.
I found that get-edid wouldn’t like to work even on original carrier board…
It seems I do something wrong…
root@tegra-ubuntu:~# get-edid | parse-edid
This is read-edid version 3.0.1. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 1
[ 5758.627235] tegra-i2c 7000c700.i2c: --- register dump for debugging ----
[ 5758.634121] tegra-i2c 7000c700.i2c: I2C_CNFG - 0x22c00
[ 5758.640078] tegra-i2c 7000c700.i2c: I2C_PACKET_TRANSFER_STATUS - 0x10001
[ 5758.649713] tegra-i2c 7000c700.i2c: I2C_FIFO_CONTROL - 0xe0
[ 5758.655301] tegra-i2c 7000c700.i2c: I2C_FIFO_STATUS - 0x800040
[ 5758.661176] tegra-i2c 7000c700.i2c: I2C_INT_MASK - 0xed
[ 5758.666403] tegra-i2c 7000c700.i2c: I2C_INT_STATUS - 0x0
[ 5758.671843] tegra-i2c 7000c700.i2c: msg->len - 1
[ 5758.676558] tegra-i2c 7000c700.i2c: is_msg_write - 1
[ 5758.681569] tegra-i2c 7000c700.i2c: next_msg->len - 1
[ 5758.686675] tegra-i2c 7000c700.i2c: is_next_msg_write - 0
[ 5758.692074] tegra-i2c 7000c700.i2c: buf_remaining - 1
[ 5758.697157] tegra-i2c 7000c700.i2c: i2c transfer timed out, addr 0x0050, data 0x00
No EDID on bus 3
No EDID on bus 4
[ 5759.697341] tegra-i2c 7000d100.i2c: --- register dump for debugging ----
[ 5759.704206] tegra-i2c 7000d100.i2c: I2C_CNFG - 0x22c00
[ 5759.709757] tegra-i2c 7000d100.i2c: I2C_PACKET_TRANSFER_STATUS - 0x10001
[ 5759.716542] tegra-i2c 7000d100.i2c: I2C_FIFO_CONTROL - 0xe0
[ 5759.722403] tegra-i2c 7000d100.i2c: I2C_FIFO_STATUS - 0x800040
[ 5759.728423] tegra-i2c 7000d100.i2c: I2C_INT_MASK - 0xed
[ 5759.733694] tegra-i2c 7000d100.i2c: I2C_INT_STATUS - 0x0
[ 5759.739078] tegra-i2c 7000d100.i2c: msg->len - 1
[ 5759.743725] tegra-i2c 7000d100.i2c: is_msg_write - 1
[ 5759.748794] tegra-i2c 7000d100.i2c: next_msg->len - 1
[ 5759.753860] tegra-i2c 7000d100.i2c: is_next_msg_write - 0
[ 5759.759421] tegra-i2c 7000d100.i2c: buf_remaining - 1
[ 5759.764494] tegra-i2c 7000d100.i2c: i2c transfer timed out, addr 0x0050, data 0x00
No EDID on bus 5
No EDID on bus 6
1 potential busses found: 2
Bus 2 doesn't really have an EDID...
Couldn't find an accessible EDID on this computer.
I'm sorry nothing was successful. Maybe try some other arguments
if you played with them, or send an email to Matthew Kern <pyrophobicman@gmail.com>.
Partial Read... Try again
This tends to validate the idea that default video mode changed between the earlier and later L4T, and that you “got lucky” on earlier mode working with your monitor. There seem to be a lot of monitors with some quirk in their EDID output which needs a workaround. There is an email address to send data to to see about quirk workarounds, but you’ll likely be asked to first upgrade your read-edid package version to 3.0.2+.
Once you have the latest read-edid, and if the error still shows, this email address becomes part of the read-edid failure message, and you can get information on fixing this particular monitor quirk (at least for the EDID acquisition, but there may still be issues to deal with on the Jetson end):
pyrophobicman@gmail.com
If you post the content of this file you can see what other EDID readers think (e.g., paste into http://www.edidreader.com):
Unfortunately I cannot upgrade 23.2 because this way I will lose my working environment…
I’ve tried to look at the modern builds and found that I have to rewrite my DT, drivers and related code…
Now I have:
ubuntu@tegra-ubuntu:~$ sha1sum -c /etc/nv_tegra_release
/usr/lib/arm-linux-gnueabihf/tegra/libnvmmlite_image.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvomx.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmedia.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmmlite_utils.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libglx.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libscf.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvexif.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvrm_gpu.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmm_parser.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvrm.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmm_contentpipe.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvos.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvtnr.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvavp.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmmlite_video.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvodm_imager.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvjpeg.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvtvmr.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvdc.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libtegrav4l2.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmm.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvapputil.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvcameratools.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvcam_imageencoder.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmmlite_audio.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmm_utils.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvomxilclient.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvwinsys.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnveglstreamproducer.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvrm_graphics.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvddk_2d_v2.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvtestresults.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvparser.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvddk_vic.so: OK
/usr/lib/arm-linux-gnueabihf/tegra/libnvmmlite.so: OK
/usr/lib/xorg/modules/drivers/nvidia_drv.so: OK
/usr/lib/xorg/modules/extensions/libglx.so: OK
ubuntu@tegra-ubuntu:~$ ls -l /usr/lib/xorg/modules/extensions/libglx.so
lrwxrwxrwx 1 root root 44 Oct 17 17:27 /usr/lib/xorg/modules/extensions/libglx.so -> /usr/lib/arm-linux-gnueabihf/tegra/libglx.so
ubuntu@tegra-ubuntu:~$ sudo dpkg --list | grep 'read-edid'
ii read-edid 3.0.1-2 armhf hardware information-gathering tool for VESA PnP monitors
See if the same issue shows up with read-edid when using 3.0.2.
If you paste the raw EDID hex code from above here, you’ll see what a different parser says:
[url]http://www.edidreader.com/[/url]
The check sum is valid, and obviously i2c is able to read the data. So the issue is in how the data is parsed. Likely the default mode does not match a mode under the “Timing Bitmap” listing. Other modes may be possible if parsed differently, but you’ll need to test first with read-edid 3.0.2 before you can send email to get a quirk workaround at the email address listed in the read-edid error text.
I’m calm, please believe me. :) I just trying to find a solution… But sometimes it looks like a gambling because there is no any docs describes relation between hardware and software worlds of tx1… :(
Regarding my question. I’ve written " I even have no chance to disable it in xorg.conf…"
It means I actually need working LCD, but I cannot control it at all…
Hello, Alex:
Jetson document can be downloaded @ Jetson Download Center | NVIDIA Developer
If there’s any topic missed, please give out details. We will keep improving document.