rockowitz
commented
7 years ago Have you tried swapping the monitors? Though the monitors have the same model string, the EDIDs show that they are slightly different. Does the problem stay with the monitor, or with the DisplayPort connection?
Is DDC/CI enabled in the OSD?
Please run the command "ddcutil environment --verbose" and send the output as an attachment.
From ddcutil's perspective, there's no difference between a DisplayPort and non-DisplayPort connection. That the video driver emulates the I2C bus over the DisplayPort AUX channel should be transparent. However, given the newness of the amdgpu driver I wouldn't be surprised if there are issues. I have a RX280 card in a test system. I'll make a point of testing it with amdgpu/DisplayPort.
Sanford
On 04/05/2017 10:25 PM, Jan wrote:
Hello
I'm using 2 monitors LG 24EB23. Both attached to an Radeon R9 290 using the amdgpu driver on an Arch linux with the latest kernel (4.10.8)
I can control the monitor attached via DVI with ddcutil. But not the one attached via DP
|# ddcutil detect --verbose Output level: Verbose Reporting DDC data errors: false Trace groups active: none Force I2C slave address: false Display 1 I2C bus: /dev/i2c-5 Supports DDC: true I2C address 0x30 (EDID block#) present: true I2C address 0x37 (DDC) present: true I2C address 0x50 (EDID) present: true /sys/bus/i2c/devices/i2c-5/name: AMDGPU i2c bit bus 0x95 EDID synopsis: Mfg id: GSM Model: 24EB23 Serial number: (disclosed) Manufacture year: 2014 EDID version: 1.3 Product code: 0x59b4 (22964) Extra descriptor: Unspecified Video input definition: 0x80 - Digital Input White x,y: 0.312, 0.329 Red x,y: 0.652, 0.335 Green x,y: 0.304, 0.633 Blue x,y: 0.152, 0.065 Extension blocks: 0 EDID hex dump: +0 +4 +8 +c 0 4 8 c +0000 00 ff ff ff ff ff ff 00 1e 6d b4 59 b4 9b 02 00 .........m.Y.... +0010 09 18 01 03 80 34 21 78 ea 3c 31 a7 55 4d a2 27 .....4!x.<1.UM.' +0020 10 50 54 a5 4b 00 71 4f 81 00 81 80 81 8f 95 00 .PT.K.qO........ +0030 a9 40 b3 00 d1 c0 28 3c 80 a0 70 b0 23 40 30 20 .@....(<..p.#@0 +0040 36 00 08 4a 21 00 00 1a 00 00 00 fd 00 38 4b 1e 6..J!........8K. +0050 53 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 32 S... .....2 +0060 34 45 42 32 33 0a 20 20 20 20 20 20 00 00 00 ff 4EB23. .... +0070 00 0a 20 20 20 20 20 20 20 20 20 20 20 20 01 d4 .. .. VCP version: 2.1 Controller mfg: Mstar Firmware version: 1.1 Invalid display I2C bus: /dev/i2c-8 Supports DDC: true I2C address 0x30 (EDID block#) present: false I2C address 0x37 (DDC) present: true I2C address 0x50 (EDID) present: true /sys/bus/i2c/devices/i2c-8/name: card0-DP-1 EDID synopsis: Mfg id: GSM Model: 24EB23 Serial number: Manufacture year: 2013 EDID version: 1.4 Product code: 0x59b5 (22965) Extra descriptor: Unspecified Video input definition: 0xa5 - Digital Input(DisplayPort) White x,y: 0.312, 0.329 Red x,y: 0.652, 0.335 Green x,y: 0.304, 0.633 Blue x,y: 0.152, 0.065 Extension blocks: 1 EDID hex dump: +0 +4 +8 +c 0 4 8 c +0000 00 ff ff ff ff ff ff 00 1e 6d b5 59 01 01 01 01 .........m.Y.... +0010 01 17 01 04 a5 34 21 78 fa 3c 31 a7 55 4d a2 27 .....4!x.<1.UM.' +0020 10 50 54 21 08 00 71 40 81 c0 81 00 81 80 95 00 .PT!..q@........ +0030 a9 40 b3 00 d1 c0 28 3c 80 a0 70 b0 23 40 30 20 .@....(<..p.#@0 +0040 36 00 08 4a 21 00 00 1a 00 00 00 fd 00 38 3d 1e 6..J!........8=. +0050 53 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 32 S... .....2 +0060 34 45 42 32 33 0a 20 20 20 20 20 20 00 00 00 ff 4EB23. .... +0070 00 0a 20 20 20 20 20 20 20 20 20 20 20 20 01 d4 .. .. DDC communication failed Is DDC/CI enabled in the monitor's on-screen display? |
(I've stripped the serial number from the first hex dump, the second was already empty)
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shantanub08
Hello
I'm using 2 monitors LG 24EB23. Both attached to an Radeon R9 290 using the amdgpu driver on an Arch linux with the latest kernel (4.10.8)
I can control the monitor attached via DVI with ddcutil. But not the one attached via DP
(I've stripped the serial number from the first hex dump, the second was already empty)