rockowitz
commented
7 years ago Andreas,
First, some lesser comments: 1) interrogate just packages up detect, environment, usbenvironment, and probe of each detected monitor, all with --verbose and a few other tweaks. So for diagnosing your problem detect and environment give us all the relevant information. 2) The failure at the end of the "sudo ddcutil interrogate --verbose" report is due to an unexpected library return code in the usbenvironment section of interrogate. Since you don't have a USB connected monitor, this is unrelated to your problem. The output of detect and environment is all that matters. 3) Looking at the output of the environment portion of the interrogate run (without sudo), we see that user andreas does not have RW permission on the /dev/ii2c devices. You'll need to fix this if you want to run ddcutil other than as root. This is just a configuration issue. 4) You mention that you used to run ddcutil with AMD hardware. Were you using the proprietary AMD driver or the open source radeon driver? I'm particularly interested if it's the former case. 5) In the future, please send send output reports as multiple attachments, with the output of 1 command per file. It's more convenient for me 6) Re X11 configuration, I too find it painful. I've had good success not specifying any xorg.conf file, letting X11 figure things out. Overriding values, such as the special RegistryDwords settings, are in files in /etc/X11/xorg.conf.d. I've used the proprietary Nvidia driver on a GTX650ti with 4 monitors this way. 7) The special RegistryDwords settings may be necessary for successfully reading and writing DDC commands on I2C slave address x37. However, they have no effect on whether that address is detected, only on whether reads and writes are not corrupted.
With all that out of the way, we're down to the real problem: why isn't the proprietary Nvidia driver allocating a /dev/i2c device for the second monitor. I'm afraid I haven't a clear answer. The nvidia I2C support for recent cards has been problematic. Here are a couple things you can try:
- Use the DVI connection instead of DisplayPort. You'll probably need a dual-link DVI cable. Or use a second HDMI connection. With DisplayPort, I2C signals are transmitted over the AUX channel instead of dedicated pins. (This is referred to as I2C-Over-AUX.) While DisplayPort has always worked for me, user reports suggest there can be problems.
- Try eliminating file /etc/X11/xorg.conf, and let X11 figure out the configuration.
Let me know how it goes.
Sanford
On 07/15/2017 07:18 PM, Andreas Backx wrote:
Previously I was using ddcutil without any problems on AMD hardware. Because of the mining craze I got a good deal on my used AMD hardware and a good deal on a GTX 1070. Now unfortunately I cannot get ddcutil to work on one of my monitors. It seems to only detect 1 monitor, but the environment says there is a second one, it just cannot find the udev information. I've got 2 Dell U2515H connected (1 landscape over HDMI and 1 portrait over DP), here is some more information of the following commands https://gist.github.com/AndreasBackx/aface790b59f3dd5b3c143fa0e1244ee.
sudo ddcutil detect --verbose sudo ddcutil environment --verbose sudo ddcutil interrogate --verbose ddcutil interrogate --verbose
I'm not the greatest when it comes to X11 config, but here is my config regardless.
//etc/X11/xorg.conf/
|Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Monitor" Identifier "Monitor1" HorizSync 28.0 - 33.0 VertRefresh 43.0
- 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" Option "RegistryDwords" "RMUseSwI2c=0x01; RMI2cSpeed=100" EndSection Section "Device" Identifier "Device1" Driver "nvidia" VendorName "NVIDIA Corporation" Option "RegistryDwords" "RMUseSwI2c=0x01; RMI2cSpeed=100" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "DPI" "96 x 96" Option "metamodes" "nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Device1" Monitor "Monitor1" DefaultDepth 24 Option "DPI" "96 x 96" Option "metamodes" "nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }" SubSection "Display" Depth 24 EndSubSection EndSection |
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AndreasBackx
anupam-git
toshi2k2
Previously I was using ddcutil without any problems on AMD hardware. Because of the mining craze I got a good deal on my used AMD hardware and a good deal on a GTX 1070. Now unfortunately I cannot get ddcutil to work on one of my monitors with the proprietary Nvidia drivers. It seems to only detect 1 monitor, but the environment says there is a second one, it just cannot find the udev information. I've got 2 Dell U2515H connected (1 landscape over HDMI and 1 portrait over DP), here is some more information of the following commands.
I'm not the greatest when it comes to X11 config, but here is my config regardless.
/etc/X11/xorg.conf