Comments (5)
rockowitz
commented on July 22, 2024
1
Your output confirms my diagnosis. The output of ddcutil detect --verbose reports "Unable to determine how monitor reports unsupported features", and getvcp for non-existent feature xDD appears to succeed.
I will look into how to report this situation in a less confusing way, and into possibly suppressing these messages altogether for terse output.
from ddcutil.
rockowitz
commented on July 22, 2024
1
I have changed the message to hopefully be more clear that this is a monitor problem. The message is emitted only if option --verbose is specified. The detailed message is always written to the system log.
Changes were applied to branch 2.0.2-dev.
from ddcutil.
rockowitz
commented on July 22, 2024
As part of display detection, ddcutil checks how the display reports an unsupported feature. The proper way is to set the unsupported feature flag in the getvcp reply packet. Some monitors do not adhere to the spec and report an unsupported feature in some other way, e.g. by returning a DDC Null Response, or don't give any indication that a feature is unsupported. The messages you are seeing indicate the monitor does not use the unsupported feature flag.
What is the output of ddcutil detect --verbose and ddcutil getvcp dd?
from ddcutil.
OPerepadia
commented on July 22, 2024
ddcutil detect --verbose
busno=6, Feature 0x41 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
busno=6, Feature 0xdd should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
busno=6, Feature 0x00 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Display 1
I2C bus: /dev/i2c-6
DRM connector: card1-DP-1
/sys/class/drm/card1-DP-1/dpms On
/sys/class/drm/card1-DP-1/enabled enabled
/sys/class/drm/card1-DP-1/status connected
Driver: amdgpu
I2C address 0x50 (EDID) responsive: true
I2C address 0x37 (DDC) responsive: true
Is eDP device: false
Is LVDS device: false
/sys/bus/i2c/devices/i2c-6/name AMDGPU DM aux hw bus 1
PCI device path: /sys/devices/pci0000:00/0000:00:08.1/0000:30:00.0/drm/card1/card1-DP-1/i2c-6
EDID synopsis:
Mfg id: DEL - Dell Inc.
Model: DELL P2418D
Product code: 53441 (0xd0c1)
Serial number: MY3ND91O0AKT
Binary serial number: 809585492 (0x30414b54)
Manufacture year: 2019, Week: 4
EDID version: 1.4
Extra descriptor:
Video input definition: 0xa5 - Digital Input (DisplayPort), Bit depth: 8
Supported features:
DPMS active-off
Digital display type: RGB 4:4:4 + YCrCb 4:4:4 + YCrCb 4:2:2
Standard sRGB color space: True
White x,y: 0.313, 0.329
Red x,y: 0.662, 0.330
Green x,y: 0.304, 0.614
Blue x,y: 0.149, 0.062
Extension blocks: 1
EDID source: I2C
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 10 ac c1 d0 54 4b 41 30 ............TKA0
+0010 04 1d 01 04 a5 35 1e 78 3a ad 75 a9 54 4d 9d 26 .....5.x:.u.TM.&
+0020 0f 50 54 a5 4b 00 81 00 b3 00 d1 00 71 4f a9 40 .PT.K.......qO.@
+0030 81 80 d1 c0 01 01 56 5e 00 a0 a0 a0 29 50 30 20 ......V^....)P0
+0040 35 00 0e 28 21 00 00 1a 00 00 00 ff 00 4d 59 33 5..(!........MY3
+0050 4e 44 39 31 4f 30 41 4b 54 0a 00 00 00 fc 00 44 ND91O0AKT......D
+0060 45 4c 4c 20 50 32 34 31 38 44 0a 20 00 00 00 fd ELL P2418D. ....
+0070 00 31 56 1d 71 1c 01 0a 20 20 20 20 20 20 01 c1 .1V.q... ..
VCP version: 2.1
Controller mfg: RealTek
Firmware version: 1.2
Unable to determine how monitor reports unsupported features
Current dynamic sleep adjustment multiplier: 0.10
ddcutil getvcp dd
busno=6, Feature 0x41 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
busno=6, Feature 0xdd should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
busno=6, Feature 0x00 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
VCP code 0xdd (Unknown feature ): mh=0xff, ml=0xff, sh=0x02, sl=0x01
from ddcutil.
ti-mo
commented on July 22, 2024
Hi! I have a similar setup to OP, running two S2721DGF. Also started noticing it this week after an upgrade.
On 2.0.2-dev, the Feature 0x41 should not exist but ddc_get_nontable_vcp_value() succeeds warnings are gone, both in detect and getvcp subcommands. Thanks for the quick fix!
from ddcutil.
Related Issues (20)
- ddcutil 2.0.0
- Why is the 0x37 address missing from my computer? HOT 8
- Error messages/warnings are printed to stdout HOT 7
- Samsung LS32A70 port mapping errata with workarounds for 'Notes on specific monitors' HOT 1
- Simplest code triggers assertion failure HOT 9
- Experimental option --skip-ddc-checks HOT 1
- changing monitor color mode HOT 1
- dccutil 2.0 regression, sporadic errors (Display not found, unsupported feature code) HOT 27
- Koorui 27E3Q: detection works, setting brightness also works but changes aren't physically reflected HOT 2
- ddca_get_any_vcp_value_using_implicit_type() incorrect order of arguments passed to ddca_get_any_vcp_value_using_explicit_type() HOT 5
- Invalid display with eDP laptop when running `ddcutil detect` HOT 1
- Invalid utf-8 in EDID decode Extra descriptor HOT 5
- ubsan int overflow HOT 2
- stack overflow in query_proc_modules_for_video leading to segfault HOT 5
- With "--enable-usb=no", compile error: ‘ignored_vid_pid’ undeclared HOT 1
- The brightness is always set to 0 when executing `setvcp` on Rpi5 Bookworm HOT 1
- Samsung U32J59x only works on DisplayPort HOT 6
- ddcutil 2.0 regression. (Invalid Display. DDC communication failed. causes: EIO / ETIMEDOUT). works in 1.4.1-1 HOT 13
- current development branch is now 2.1.0-dev
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from ddcutil.