| LinuxUser2393 |
04-23-2017 04:02 AM |
DDC/CI control?
1 Attachment(s)
Hi,
I am desperate for some sort of brightness control! I read here
Quote:
new feature for the DisplayLink DL-4xxx series available from DisplayLink driver release 8.1 Alpha as a preview. From the general release 8.1 M0, any user will be able to change brightness and contrast on USB monitors using any utility complying with the DDC/CI standard. This allows users to use a single application to change brightness and contrast on all their displays, either connected through any DisplayLink product, or to a standard computer graphics card.
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Is there any chance for DDC/CI control with Linux? I've installed ddcutil
HTML Code:
~$ sudo ddcutil usbenvironment
The following tests probe for USB connected monitors.
Checking for USB connected monitors...
Using lsusb to summarize USB devices...
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 003: ID 0cf3:3004 Atheros Communications, Inc. AR3012 Bluetooth 4.0
Bus 001 Device 004: ID 5986:055c Acer, Inc
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 009: ID 1770:ff00
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 003 Device 006: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 004 Device 064: ID 17e9:ff03 DisplayLink
USB device toplogy...
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
|__ Port 2: Dev 64, If 0, Class=Vendor Specific Class, Driver=usbfs, 5000M
|__ Port 2: Dev 64, If 1, Class=Application Specific Interface, Driver=, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/14p, 480M
|__ Port 1: Dev 2, If 2, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 5: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 5: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 5: Dev 6, If 2, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
|__ Port 8: Dev 9, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 3: Dev 3, If 0, Class=Wireless, Driver=, 12M
|__ Port 3: Dev 3, If 1, Class=Wireless, Driver=, 12M
|__ Port 4: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 4: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
Listing /dev/usb...
total 0
crw------- 1 root root 180, 0 Apr 17 12:46 hiddev0
crw------- 1 root root 180, 1 Apr 18 16:49 hiddev1
Listing /dev/hiddev*...
ls: cannot access '/dev/hiddev*': No such file or directory
Listing /dev/bus/usb...
total 0
drwxr-xr-x 2 root root 120 Apr 17 12:46 001
drwxr-xr-x 2 root root 100 Apr 22 15:13 002
drwxr-xr-x 2 root root 100 Apr 18 16:49 003
drwxr-xr-x 2 root root 80 Apr 22 20:14 004
Listing /dev/hidraw*...
crw------- 1 root root 245, 0 Apr 17 12:46 /dev/hidraw0
crw------- 1 root root 245, 1 Apr 17 12:46 /dev/hidraw1
crw------- 1 root root 245, 2 Apr 18 16:49 /dev/hidraw2
crw------- 1 root root 245, 3 Apr 18 16:49 /dev/hidraw3
Checking for USB HID devices using hiddev...
Found 2 USB HID devices.
Device /dev/usb/hiddev0, devnum.busnum: 3.2, vid:pid: 046d:c52b - Logitech USB Receiver
Not a USB HID monitor
Device /dev/usb/hiddev1, devnum.busnum: 3.6, vid:pid: 046d:c52b - Logitech USB Receiver
Not a USB HID monitor
Checking for USB HID Report Descriptors in /sys/kernel/debug/hid...
~$ sudo ddcutil detect
Invalid display
I2C bus: /dev/i2c-6
Supports DDC: false
EDID synopsis:
Mfg id: CMN
Model: Unspecified
Serial number: Unspecified
Manufacture year: 2012
EDID version: 1.4
DDC communication failed
No active displays found
There has got to be something I can do? I've had this monitor for what seems like a couple years and have been waiting to be able to use it at night. All of my other monitors have a much lower brightness and it's just not going to work to have something that leaves a view-burn in my retina every time I look at it..
I'm willing to beta test, debug, anything!! |
