Comments (2)
rockowitz
commented on June 24, 2024
The monitor is returning reply packets that are entirely zero, or more precisely the video adapter is reading zeros from the I2C bus after it puts a request packet on the bus.
First, option --ddc will report DDC data errors..
I'm not optimistic, but some things to try.
- Turn off dynamic sleep adjustment and force a high sleep multiplier using options: --disable-dynamic-sleep --sleep-multiplier 3
- Kernel module i2c_dev actually has 2 interfaces, one using ioctl() and one using file write()/read(). Normally ddcutil uses the ioctl() interface. To use the file io interface, specify option --use-file-io.
- If I'm reading the laptop and monitor specs correctly, in addition to HDMI they both have VGA connectors. I'm sure you don't want to normally use a VGA connection, but it would be informative if the problem persists when using that connection.
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setaur
commented on June 24, 2024
Thanks for the answer.
Yes, both laptop and monitor have VGA, but unfortunately I don't have cable at this time. I will try, when I get one.
It looks like all those commands failed to produce anything useful:
/usr/local/bin# ./ddcutil --ddc detect
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
DDC: All zero response detected in ddc_i2c_write_read_raw
Invalid display
I2C bus: /dev/i2c-5
DRM connector: card0-HDMI-A-1
EDID synopsis:
Mfg id: AOC - UNK
Model: 2475W1
Product code: 9333 (0x2475)
Serial number: P08H4QA007082
Binary serial number: 16843009 (0x01010101)
Manufacture year: 2017, Week: 16
DDC communication failed. (getvcp of feature x10 returned Error_Info[DDCRC_RETRIES in ddc_write_read_with_retry, causes: DDCRC_READ_ALL_ZERO(10)])
Invalid display
I2C bus: /dev/i2c-7
DRM connector: card0-eDP-1
EDID synopsis:
Mfg id: CMN - Chimei Innolux Corporation
Model:
Product code: 5565 (0x15bd)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2012, Week: 17
This is a laptop display. Laptop displays do not support DDC/CI
/usr/local/bin# ./ddcutil --disable-dynamic-sleep --sleep-multiplier 3 detect
Invalid display
I2C bus: /dev/i2c-5
DRM connector: card0-HDMI-A-1
EDID synopsis:
Mfg id: AOC - UNK
Model: 2475W1
Product code: 9333 (0x2475)
Serial number: P08H4QA007082
Binary serial number: 16843009 (0x01010101)
Manufacture year: 2017, Week: 16
DDC communication failed. (getvcp of feature x10 returned Error_Info[DDCRC_RETRIES in ddc_write_read_with_retry, causes: DDCRC_READ_ALL_ZERO(10)])
Invalid display
I2C bus: /dev/i2c-7
DRM connector: card0-eDP-1
EDID synopsis:
Mfg id: CMN - Chimei Innolux Corporation
Model:
Product code: 5565 (0x15bd)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2012, Week: 17
This is a laptop display. Laptop displays do not support DDC/CI
/usr/local/bin# ./ddcutil --use-file-io detect
Invalid display
I2C bus: /dev/i2c-5
DRM connector: card0-HDMI-A-1
EDID synopsis:
Mfg id: AOC - UNK
Model: 2475W1
Product code: 9333 (0x2475)
Serial number: P08H4QA007082
Binary serial number: 16843009 (0x01010101)
Manufacture year: 2017, Week: 16
DDC communication failed. (getvcp of feature x10 returned Error_Info[DDCRC_RETRIES in ddc_write_read_with_retry, causes: DDCRC_READ_ALL_ZERO(10)])
Invalid display
I2C bus: /dev/i2c-7
DRM connector: card0-eDP-1
EDID synopsis:
Mfg id: CMN - Chimei Innolux Corporation
Model:
Product code: 5565 (0x15bd)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2012, Week: 17
This is a laptop display. Laptop displays do not support DDC/CI
from ddcutil.
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