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rockowitz
AOC I2475PXQU: Invalid display
Hello. I'm trying to use ddcutil to control external monitor AOC I2475PXQU connected via hdmi cable into laptop Lenovo z510 with Debian 11 Bullseye onboard, but I'm hitting into a wall. I have installed from Debian repository ddcutil version 0.9.9 and also compiled and installed from this site ddcutil 2.1.3. Both failed to control the monitor. Function DDC/CI is enabled in a AOC settings. Manual for this monitor can be accessed here: https://manuals.coolblue.nl/eb/aoc-bundel-collectie.pdf
ddcutil 0.9.9:
# ddcutil detect --verbose
Output level: Verbose
Reporting DDC data errors: false
Trace groups active: none
Traced functions: none
Traced files: none
Force I2C slave address: false
User defined features: disabled
Performance and Retry Options:
Deferred sleep enabled: false
Sleep suppression (reduced sleeps) enabled: false
Dynamic sleep adjustment enabled: false
Invalid display
I2C bus: /dev/i2c-5
I2C address 0x50 (EDID) responsive: true
Is eDP device: false
I2C address 0x37 (DDC) responsive: true
/sys/bus/i2c/devices/i2c-5/name: i915 gmbus dpb
EDID synopsis:
Mfg id: AOC
Model: 2475W1
Serial number: P08H4QA007082
Manufacture year: 2017
EDID version: 1.3
Product code: 9333
Binary sn: 16843009 (0x01010101)
Extra descriptor:
Video input definition: 0x80 - Digital Input
Supported features:
DPMS active-off
Digital display type: RGB 4:4:4
Standard sRGB color space: False
White x,y: 0.313, 0.329
Red x,y: 0.639, 0.338
Green x,y: 0.297, 0.616
Blue x,y: 0.151, 0.053
Extension blocks: 1
EDID source:
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 05 e3 75 24 01 01 01 01 ..........u$....
+0010 10 1b 01 03 80 35 1e 78 2a a3 e5 a3 56 4c 9d 26 .....5.x*...VL.&
+0020 0d 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40 .PT............@
+0030 81 c0 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c .......:..q8-@X,
+0040 45 00 0f 28 21 00 00 1e 00 00 00 ff 00 50 30 38 E..(!........P08
+0050 48 34 51 41 30 30 37 30 38 32 00 00 00 fd 00 32 H4QA007082.....2
+0060 4c 0f 53 11 00 0a 20 20 20 20 20 20 00 00 00 fc L.S... ....
+0070 00 32 34 37 35 57 31 0a 20 20 20 20 20 20 01 16 .2475W1. ..
DDC communication failed
Is DDC/CI enabled in the monitor's on-screen display?
Invalid display
I2C bus: /dev/i2c-7
I2C address 0x50 (EDID) responsive: true
Is eDP device: true
/sys/bus/i2c/devices/i2c-7/name: AUX A/port A
EDID synopsis:
Mfg id: CMN
Model:
Serial number:
Manufacture year: 2012
EDID version: 1.4
Product code: 5565
Binary sn: 0 (0x00000000)
Extra descriptor: N156BGE-EA1
Video input definition: 0x95 - Digital Input (DisplayPort)
Supported features:
Digital display type: RGB 4:4:4
Standard sRGB color space: False
White x,y: 0.313, 0.329
Red x,y: 0.585, 0.354
Green x,y: 0.338, 0.575
Blue x,y: 0.152, 0.118
Extension blocks: 0
EDID source:
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 0d ae bd 15 00 00 00 00 ................
+0010 11 16 01 04 95 22 13 78 02 e9 15 95 5a 56 93 27 .....".x....ZV.'
+0020 1e 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01 .PT.............
+0030 01 01 01 01 01 01 79 1d 56 c2 50 00 26 30 1f 41 ......y.V.P.&0.A
+0040 4c 00 58 c2 10 00 00 18 00 00 00 fe 00 4e 31 35 L.X..........N15
+0050 36 42 47 45 2d 45 41 31 0a 20 00 00 00 fe 00 43 6BGE-EA1. .....C
+0060 4d 4e 0a 20 20 20 20 20 20 20 20 20 00 00 00 fe MN. ....
+0070 00 4e 31 35 36 42 47 45 2d 45 41 31 0a 20 00 6a .N156BGE-EA1. .j
DDC communication failed
This is an eDP laptop display. Laptop displays do not support DDC/CI.
ddcutil 2.1.3
/usr/local/bin# ./ddcutil detect --verbose
Invalid display
I2C bus: /dev/i2c-5
DRM connector: card0-HDMI-A-1
/sys/class/drm/card0-HDMI-A-1/dpms On
/sys/class/drm/card0-HDMI-A-1/enabled enabled
/sys/class/drm/card0-HDMI-A-1/status connected
Driver: i915
I2C address 0x50 (EDID) responsive: true
I2C address 0x37 (DDC) responsive: true
Is LVDS or EDP display: false
Is laptop display by EDID: false
Is laptop display: false
/sys/bus/i2c/devices/i2c-5/name i915 gmbus dpb
PCI device path: /sys/devices/pci0000:00/0000:00:02.0/i2c-5
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
EDID version: 1.3
Extra descriptor:
Video input definition: 0x80 - Digital Input
Supported features:
DPMS active-off
Digital display type: RGB 4:4:4 + YCrCb 4:4:4
Standard sRGB color space: False
White x,y: 0.313, 0.329
Red x,y: 0.639, 0.338
Green x,y: 0.297, 0.616
Blue x,y: 0.151, 0.053
Extension blocks: 1
EDID source: I2C
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 05 e3 75 24 01 01 01 01 ..........u$....
+0010 10 1b 01 03 80 35 1e 78 2a a3 e5 a3 56 4c 9d 26 .....5.x*...VL.&
+0020 0d 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40 .PT............@
+0030 81 c0 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c .......:..q8-@X,
+0040 45 00 0f 28 21 00 00 1e 00 00 00 ff 00 50 30 38 E..(!........P08
+0050 48 34 51 41 30 30 37 30 38 32 00 00 00 fd 00 32 H4QA007082.....2
+0060 4c 0f 53 11 00 0a 20 20 20 20 20 20 00 00 00 fc L.S... ....
+0070 00 32 34 37 35 57 31 0a 20 20 20 20 20 20 01 16 .2475W1. ..
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
/sys/class/drm/card0-eDP-1/dpms On
/sys/class/drm/card0-eDP-1/enabled enabled
/sys/class/drm/card0-eDP-1/status connected
Driver: i915
I2C address 0x50 (EDID) responsive: true
I2C address 0x37 (DDC) responsive: false
Is LVDS or EDP display: true
Is laptop display by EDID: false
Is laptop display: true
/sys/bus/i2c/devices/i2c-7/name AUX A/port A
PCI device path: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/i2c-7
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
EDID version: 1.4
Extra descriptor: N156BGE-EA1
Video input definition: 0x95 - Digital Input (DisplayPort), Bit depth: 6
Supported features:
Digital display type: RGB 4:4:4
Standard sRGB color space: False
White x,y: 0.313, 0.329
Red x,y: 0.585, 0.354
Green x,y: 0.338, 0.575
Blue x,y: 0.152, 0.118
Extension blocks: 0
EDID source: I2C
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 0d ae bd 15 00 00 00 00 ................
+0010 11 16 01 04 95 22 13 78 02 e9 15 95 5a 56 93 27 .....".x....ZV.'
+0020 1e 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01 .PT.............
+0030 01 01 01 01 01 01 79 1d 56 c2 50 00 26 30 1f 41 ......y.V.P.&0.A
+0040 4c 00 58 c2 10 00 00 18 00 00 00 fe 00 4e 31 35 L.X..........N15
+0050 36 42 47 45 2d 45 41 31 0a 20 00 00 00 fe 00 43 6BGE-EA1. .....C
+0060 4d 4e 0a 20 20 20 20 20 20 20 20 20 00 00 00 fe MN. ....
+0070 00 4e 31 35 36 42 47 45 2d 45 41 31 0a 20 00 6a .N156BGE-EA1. .j
This is a laptop display. Laptop displays do not support DDC/CI
Can anything be done to make this function work?
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.
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