Can't swich monitor input.

[WaflanCZ]

Uploading sudo_ddcutil_interrogate.txt…
Hi, I am trying to swich monitor input but it just dosent work. First I had a problem with plasma 6, that I resolved with --disable-cross-instance-locks. But it still dosent work.

ddcutil --bus 6 capabilities --disable-cross-instance-locks
Unable to open directory /sys/devices/pci0000:00/0000:00:03.2/0000:0c:00.0/drm: No such file or directory
Model: WK95U
MCCS version: 2.1
Commands:
   Op Code: 01 (VCP Request)
   Op Code: 02 (VCP Response)
   Op Code: 03 (VCP Set)
   Op Code: 0C (Save Settings)
   Op Code: E3 (Capabilities Reply)
   Op Code: F3 (Capabilities Request)
VCP Features:
   Feature: 02 (New control value)
   Feature: 04 (Restore factory defaults)
   Feature: 05 (Restore factory brightness/contrast defaults)
   Feature: 08 (Restore color defaults)
   Feature: 10 (Brightness)
   Feature: 12 (Contrast)
   Feature: 14 (Select color preset)
      Values:
         05: 6500 K
         08: 9300 K
         0b: User 1
   Feature: 16 (Video gain: Red)
   Feature: 18 (Video gain: Green)
   Feature: 1A (Video gain: Blue)
   Feature: 52 (Active control)
   Feature: 60 (Input Source)
      Values:
         11: HDMI-1
         12: HDMI-2
         0f: DisplayPort-1
         10: DisplayPort-2
   Feature: AC (Horizontal frequency)
   Feature: AE (Vertical frequency)
   Feature: B2 (Flat panel sub-pixel layout)
   Feature: B6 (Display technology type)
   Feature: C0 (Display usage time)
   Feature: C6 (Application enable key)
   Feature: C8 (Display controller type)
   Feature: C9 (Display firmware level)
   Feature: D6 (Power mode)
      Values:
         01: DPM: On,  DPMS: Off
         04: DPM: Off, DPMS: Off
   Feature: DF (VCP Version)
   Feature: 62 (Audio speaker volume)
   Feature: 8D (Audio Mute)
   Feature: F4 (Manufacturer specific feature)
   Feature: F5 (Manufacturer specific feature)
      Values: 01 02 03 04 (interpretation unavailable)
   Feature: F6 (Manufacturer specific feature)
      Values: 00 01 02 (interpretation unavailable)
   Feature: 4D (Unrecognized feature)
   Feature: 4E (Unrecognized feature)
   Feature: 4F (Unrecognized feature)
   Feature: 15 (Unrecognized feature)
      Values: 01 06 11 13 14 15 18 19 20 22 23 24 28 29 32 48 (interpretation unavailable)
   Feature: F7 (Manufacturer specific feature)
      Values: 00 01 02 03 (interpretation unavailable)
   Feature: F8 (Manufacturer specific feature)
      Values: 00 01 (interpretation unavailable)
   Feature: F9 (Manufacturer specific feature)
   Feature: EF (Manufacturer specific feature)
   Feature: FA (Manufacturer specific feature)
      Values: 00 01 (interpretation unavailable)
   Feature: FD (Manufacturer specific feature)
      Values: 00 01 (interpretation unavailable)
   Feature: FE (Manufacturer specific feature)
      Values: 00 01 02 (interpretation unavailable)
   Feature: FF (Manufacturer specific feature)

❯ ddcutil --bus 6 getvcp 60 --verbose --noverify --disable-cross-instance-locks
Unable to open directory /sys/devices/pci0000:00/0000:00:03.2/0000:0c:00.0/drm: No such file or directory
Feature definition file not found: GSM-LG_ULTRAGEAR-23507.mccs

Getting data for non-table VCP code 0x60 - Input Source:
Raw value: opcode=0x60, mh=0x00, ml=0x12, sh=0x00, sl=0x0f, max_val=18 (0x0012), cur_val=15 (0x000f)
VCP code 0x60 (Input Source                  ): DisplayPort-1 (sl=0x0f)

~
❯ ddcutil --bus 6 setvcp 60 0x11 --verbose --noverify --disable-cross-instance-locks
Unable to open directory /sys/devices/pci0000:00/0000:00:03.2/0000:0c:00.0/drm: No such file or directory
Feature definition file not found: GSM-LG_ULTRAGEAR-23507.mccs

[rockowitz]

Please run sudo ddcutil interrogate and submit it as an attachment. Do not paste it inline.

[WaflanCZ]

Please run sudo ddcutil interrogate and submit it as an attachment. Do not paste it inline.

Here it is.
sudo_ddcutil_interrogate.txt

[WaflanCZ]

Please run sudo ddcutil interrogate and submit it as an attachment. Do not paste it inline.

HI, could you remove the label? I already added the info.

[p0ryae]

Bump. Happens for me as well.

My interrogate output: output.txt

Running on Wayland and Arch Linux. It seems like this issue exists only when switching between display ports or power modes. Changing brightness and RGB colors work just fine.

@rockowitz any thoughts?

[WaflanCZ]

Hi @p0ryae,
I am sorry, but I completely forgot about posting this issiue. I already resolved it. I found out that LG dosent follow the standard so you need to use different codes. The wiki of this repo containes notes on it. https://github.com/rockowitz/ddcutil/wiki/Switching-input-source-on-LG-monitors

Bellow I am also including commands that I use for swiching monitors. (I recommend using bus numbers instead of display numbers if you are using multiple monitors, becouse some times they swich their numbers.)

DP-1
ddcutil -b 6 setvcp xF4 x00D0 --i2c-source-addr=x50 --noverify

HDMI-1
ddcutil -b 6 setvcp xF4 x0090 --i2c-source-addr=x50 --noverify

[p0ryae]

Thanks for this @WaflanCZ! Seemed to do something. Although sadly, I have a blinking issue when running either of those commands. The screen only blinks with no input switch. I decided to follow through with someone who seemed to have similar issue to me: #100 (comment)