https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241536
Bug ID: 241536
Summary: videcard DDC (I2C controller) do not detected
Product: Base System
Version: 12.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Do you know HDMI output includes DDC pins, what working under I2C protocol?, I
believe yes.
When I used my system under Linux (Debian), I had connected my external device
with I2C to HDMI output in my computer. After this, I have managed my external
device sending/receive codes through the I2C controller.
For example, I use command:
i2set -y 2 0x50 0x45 0x65
For added video card I2C controller to the Linux system, I had added i2c-dev
module to Linux system.
I had used this command:
modprobe i2c-dev
After this i2c controller appears in my Linux system.
for example:
test@debian# i2cdetect -l
i2c-0 i2c i915 gmbus dpa i2c adapter
i2c-1 i2c i915 gmbus dpb i2c adapter
i2c-2 i2c i915 gmbus dpc i2c adapter
i2c-3 i2c i915 gmbus dpd i2c adapter
i2c-4 i2c i915 DPDDC-C i2c adapter
i2c-0 to i2c-4 appears as well in /dev/ folders
when I move to FreeBSD, doesn't matter what I did, i2C devices do not appear in
Freebsd system, /dev/ folder does not include any of I2C controllers.
I use the same hardware under FreeBSD what I used under Linux.
See details about my hardware below.
My processor:
Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz (kaby lake)
Internal video card HD Graphics 620
My FreeBSD version is 12.0, with last patches
My kldstat just in case:
Id Refs Address Size Name
1 82 0xffffffff80200000 243d1f8 kernel
2 1 0xffffffff8263e000 2da8 smb.ko
3 5 0xffffffff82641000 2e18 smbus.ko
4 1 0xffffffff82644000 3ca8 amdsmb.ko
5 1 0xffffffff82648000 4c98 iicbb.ko
6 6 0xffffffff8264d000 6cc8 iicbus.ko
7 1 0xffffffff82654000 8910 ig4.ko
8 1 0xffffffff8265e000 3950 iicsmb.ko
9 1 0xffffffff82662000 185c8 bktr.ko
10 2 0xffffffff8267b000 1530 bktr_mem.ko
11 1 0xffffffff8267d000 3820 iic.ko
12 1 0xffffffff82681000 6230 ichsmb.ko
13 1 0xffffffff82821000 12cc50 i915kms.ko
14 1 0xffffffff8294e000 767d0 drm.ko
15 4 0xffffffff829c5000 104f0 linuxkpi.ko
16 3 0xffffffff829d6000 12f30 linuxkpi_gplv2.ko
17 2 0xffffffff829e9000 6c0 debugfs.ko
18 1 0xffffffff829ea000 15630 if_iwm.ko
19 1 0xffffffff82a00000 10045f iwm7260fw.ko
20 1 0xffffffff82b01000 3aa0 ng_ubt.ko
21 2 0xffffffff82b05000 a020 netgraph.ko
22 1 0xffffffff82b10000 9608 ng_hci.ko
23 1 0xffffffff82b1a000 9c0 ng_bluetooth.ko
24 1 0xffffffff82b1b000 17590 smbfs.ko
25 2 0xffffffff82b33000 3050 libiconv.ko
26 2 0xffffffff82b37000 1dce libmchain.ko
27 1 0xffffffff82b39000 acf mac_ntpd.ko
How you see, I had added a lot of useless modules, but they didn't help.
If you need any additional information, I am ready to provide.
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