ED-HMI2220-070C: black screen with stock driver bridge-init value 0x02; 0x01 restores display on affected unit
維護者通常 1 天內回覆
還沒有人認領這個 Issue。
評估
- 難度
- 4/5
- 預估耗時
- 3-5 天
- 新手友好度
- 45/100
- Issue 類型
- 缺陷
- 描述清晰度
- 基本清楚
- 活躍度
- 活躍
- 技術堆疊
- c, linux
研究方向
Start with drivers/regulator/edatec-panel-regulator.c and inspect the REG_BRIDGE_INIT write alongside the device-tree overlay configuration and the reported I2C values. Compare behavior across affected and unaffected panel units or controller revisions to determine how the initialization value should be selected. Done means the affected display works after a cold boot while supported units retain working displays; add or run relevant regulator and panel tests if available.
由索引模型根據 Issue 內容生成。
描述
Describe the bug
When installing and operating system, such as the latest Raspberry Pi OS release.
The HMI will be blank. The HDMI port will work. The HMI will not.
Steps to reproduce the behaviour
reinstall an os,
Or, after applying work around, unapply work around. same behavior.
Issue may be present in certain specific versions
Device (s)
Ed-HMI2220-070c
System
pi@raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 13 (trixie)"
NAME="Debian GNU/Linux"
VERSION_ID="13"
VERSION="13 (trixie)"
VERSION_CODENAME=trixie
DEBIAN_VERSION_FULL=13.7
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
$ uname -a
Linux raspberrypi 6.18.50+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.18.50-1+rpt1 (2026-09-11) aarch64 GNU/Linux
pi@raspberrypi:~ $ vcgencmd version
Sep 14 2026 14:49:30
Copyright (c) 2012 Broadcom
version a86983925695a7e63166327d7c002d64040ed31d (clean) (release) (start)
pi@raspberrypi:~ $ cat /etc/rpi-issue
Raspberry Pi reference 2026-10-06
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, b2cd98a9ee08a31ef7d0110ed09f2492bbd972ec, stage4
Logs
No response
Additional context
This issue may pertain to the 8GB or older models of the ED-HMI2220-070C
From testing, the 32GB model is unaffected.
Environment:
- Hardware: EDATEC ED-HMI2220-070C, unit with 8 GB eMMC storage
- OS: Debian GNU/Linux 13 (Trixie), using Raspberry Pi kernel packages
- Kernel: 6.18.50+rpt-rpi-v8
- Driver: edatec_panel_regulator
- Default overlay configuration
dtoverlay=vc4-kms-v3d
[all]
dtoverlay=vc4-kms-dsi-edatec-panel-070c,interrupt=7
I followed EDATEC application notes, which describes support through the stock Raspberry Pi kernel and overlays.
Expected Behavior:
The built-in display shows the console and desktop after boot.
Actual beahvior:
The backlight turns on, but the screen remains black. HDMI output works.
The kernel reports DSI-1 as connected and enabled at 1024×600.
workaround
enable userspace i2c
sudo i2ctransfer -f -y 10 w2@0x27 0x11 0x01
Desktop appears instantly
suspected source Issue:
https://github.com/raspberrypi/linux/blob/rpi-6.18.y/drivers/regulator/edatec-panel-regulator.c
regmap_write(regmap, REG_BRIDGE_INIT, 0x02);
is evidently incorrect for this unit model.
repeatability:
sudo i2ctransfer -f -y 10 w2@0x27 0x11 0x02
setting the value back to its initial setting will reproduce the issue, if the HMI is fully powered off, then restarted. simply running the command will not produce the initial behavior.
Proposal for resolution:
Please investigate whether the bridge-initialization value needs to be selected according to the panel-controller revision or exposed through a device-tree property, rather than fixed at 0x02 for all supported units.
I only have 8GB and 32GB models of this device, and I am not saying there is some correlation between disk space and video driver issues. This issue may effect various unit models, older or newer models, I'm not really sure. The ones with the blue label, maybe that indicates something relevant to the appropriate person. I have not compiled a specific hardware variants list that might compare hardware differences, or versions of this device, and the device itself is not clearly labeled. All I can verify is that I have some 8GB models of The Ed-HMI2220-070c device, and they are effected by this condition.
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環境準備
這個專案沒有提供開發容器、Dockerfile 或貢獻指南，環境需要你自己搭建：先看它的 README，通用步驟見我們的新手貢獻指南。
從這裡開始
- 先讀完整個 Issue，再讀專案的貢獻指南。
- 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
- Fork 儲存庫，在一個分支上完成修改。
- 送出 Pull Request，並在描述裡引用這個 Issue 編號。
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