I have a monitor LG E2251 (monitor details).
My computer was connected to the monitor via DVI-I cable; after the power supply broke, the display went black. I rebooted the system and all seemed ok. I pass the POST as usual, however I cannot see the GUI nor CLI when connected with DVI-I. I believe the EDID code for DVI-I has been corrupted. I also tried with other 2 connections: whether HDMI doesn't present any damge,I get the following message for DVI-I
nouveau 0000:01:00.0: DRM: VRAM: 1024 MiB
[ 9.292129] nouveau 0000:01:00.0: DRM: GART: 1048576 MiB
[ 9.292133] nouveau 0000:01:00.0: DRM: TMDS table version 2.0
[ 9.292135] nouveau 0000:01:00.0: DRM: DCB version 4.0
[ 9.292137] nouveau 0000:01:00.0: DRM: DCB outp 00: 01000302 00020030
[ 9.292139] nouveau 0000:01:00.0: DRM: DCB outp 01: 02000300 00000000
[ 9.292141] nouveau 0000:01:00.0: DRM: DCB outp 02: 02011362 00020010
[ 9.292143] nouveau 0000:01:00.0: DRM: DCB outp 03: 01022310 00000000
[ 9.292145] nouveau 0000:01:00.0: DRM: DCB conn 00: 00001030
[ 9.292146] nouveau 0000:01:00.0: DRM: DCB conn 01: 00002161
[ 9.292148] nouveau 0000:01:00.0: DRM: DCB conn 02: 00000200
[ 9.296293] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 9.296294] [drm] Driver supports precise vblank timestamp query.
[ 9.309393] nouveau 0000:01:00.0: DRM: MM: using COPY for buffer copies
[drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 185
[ 9.449801] nouveau 0000:01:00.0: DVI-I-1: EDID block 0 invalid.
[ 9.449803] nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for DVI-I-1
[ 9.470675] nouveau 0000:01:00.0: No connectors reported connected with modes
[ 9.470678] [drm] Cannot find any crtc or sizes - going 1024x768
[ 9.472105] nouveau 0000:01:00.0: DRM: allocated 1024x768 fb: 0x70000, bo ffff9d41b8eafc00
[ 9.472196] fbcon: nouveaufb (fb0) is primary device
[ 9.474979] Console: switching to colour frame buffer device 128x48
[ 9.476170] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device
[ 9.508021] [drm] Initialized nouveau 1.3.1 20120801 for 0000:01:00.0 on minor 0
and a similar one for VGA
[drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 198
[ 95.783329] nouveau 0000:01:00.0: VGA-1: EDID block 0 invalid.
[ 95.783331] nouveau 0000:01:00.0: DRM: DDC responded, but no EDID for VGA-1
MY APPROACH
- installed
i2c-tools
on my debian machine. - found
i2c-1
to be my DVI interface - with
i2cdump -y 1 0x50
I can dump the EDID code.
i2cset
However, when I want to set a block of bytes with
i2cset -y 1 0x50 0x00 0x00 0xff i
EDID does not change.
How can I correct those EDID? Is there a fast solution in the UserSpace, without assembly programming?
I say I'm new to EDID, nouveau driver, I2C or SMBus communication. Any advice and correction is appreciated.
It looks like I could send BLOCKs of bytes on that I2C BUS i2cdetect -F 1
:
Functionalities implemented by /dev/i2c-1:
I2C Block Write yes
I2C Block Read yes
...
but I don't know what's wrong.