rockowitz
commented
7 years ago Thomas,
Your report is very useful. I've been working on trying to better handle the corner case where the pseudo-I2C bus for the laptop's display claims to support DDC when it fact it doesn't.
Please run the following command and send me the output. ddcutil environment --verbose
Are you installing ddcutil from git, the tarball, or one of the rpms or dpkgs? I ask because it might be helpful if you could install a development version of ddcutil.
Thanks, Sanford
On 01/12/2017 12:23 AM, Thomas McMahon wrote:
Hi
I built ddcutil 0.7.0 on Ubuntu 16.10. I have two external displays connected to my Lenovo x260 via a Lenovo Ultra Dock. The displays are Dell U2412Ms.
Here is the output of |ddcutil detect|:
|sudo ddcutil detect Display 1 I2C bus: /dev/i2c-3 Supports DDC: true EDID synopsis: Mfg id: AUO Model: Unspecified Serial number: Unspecified Manufacture year: 2015 EDID version: 1.4 VCP version: Detection failed Invalid display I2C bus: /dev/i2c-5 Supports DDC: false EDID synopsis: Mfg id: DEL Model: DELL U2412M Serial number: Unspecified Manufacture year: 2015 EDID version: 1.4 Display 2 I2C bus: /dev/i2c-6 Supports DDC: true (ddc_open_display) No EDID for device on bus /dev/i2c-6 Error opening display bus /dev/i2c-6, error = -3016 (DDCRC_EDID) (ddc_close_display) close_i2c_bus returned 9 Display 3 I2C bus: /dev/i2c-7 Supports DDC: true (ddc_open_display) No EDID for device on bus /dev/i2c-7 Error opening display bus /dev/i2c-7, error = -3016 (DDCRC_EDID) (ddc_close_display) close_i2c_bus returned 9 |
However when I try and detect monitor capabilities it doesn't work:
|tom@x260:~$ sudo ddcutil capabilities --display 1 Unable to get capabilities for monitor on Display_Handle[i2c: fh=3, busno=3]. Maximum DDC retries exceeded. |
This seems like it may be related to issue number 8 https://github.com/rockowitz/ddcutil/issues/8 - I'm not really all that stressed about not getting this to work, but thought this might be helpful.
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Hi
I built ddcutil 0.7.0 on Ubuntu 16.10. I have two external displays connected to my Lenovo x260 via a Lenovo Ultra Dock. The displays are Dell U2412Ms.
Here is the output of
ddcutil detect:However when I try and detect monitor capabilities it doesn't work:
This seems like it may be related to issue number 8 - I'm not really all that stressed about not getting this to work, but thought this might be helpful.