Steam Machine: Acer XB270H gets no EDID over DP, falls back to 640x480
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- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 15/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- linux
调研方向
The failure is in the DisplayPort EDID path: start by reading /sys/class/drm/card0-DP-1/edid (0 bytes) and /sys/class/drm/card0-DP-1/modes (only 640x480), then the debugfs override at /sys/kernel/debug/dri/0/DP-1/edid_override described in the linked workaround repo. Done means a reproducible diagnosis of why the sink returns no EDID over AUX, or a kernel-side fallback that gets the panel's native modes without manual overrides.
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描述
Your system information
- Steam client version:
VERSION_ID=3.9.5 - SteamOS version:
VERSION_CODENAME=holo,KERNEL:7.2.7-valve2-2-neptune-72-g31504582a073 - Opted into Steam client beta?: No
- Opted into SteamOS beta?: No
- Have you checked for updates in Settings > System?: Yes
Please describe your issue in as much detail as possible:
An Acer XB270H (hardware G-SYNC module, native 1920x1080 @ 144 Hz) connected
over DisplayPort is offered only 640x480. Expected: 1920x1080 with 60/100/120/144 Hz.
/sys/class/drm/card0-DP-1/edid is 0 bytes and modes lists a single 640x480
entry while status is connected. The same monitor reports a full EDID from an
NVIDIA host. The AI guess is "that the G-SYNC module NAKs DDC/EDID over AUX from non-NVIDIA sources, so the kernel gets no EDID and uses its no-EDID fallback."
Workaround, verified: writing the monitor's captured 256-byte EDID
hex to /sys/kernel/debug/dri/0/DP-1/edid_override, then
echo on and echo detect to /sys/class/drm/card0-DP-1/status, gives
1920x1080 at 60/100/120/144 Hz. A boot-time oneshot unit that re-applies it
works in Game Mode at 144 Hz, across reboot and monitor sleep/wake
(not yet checked across a SteamOS update). So the kernel and gamescope handle the
mode fine once an EDID exists; the failure is isolated to the sink returning none.
Workaround repo: https://github.com/JasonEckardt/steamos-edid-fix
Steps for reproducing this issue:
- Connect an Acer XB270H to the Steam Machine's DisplayPort output.
- Boot, or hotplug the cable.
- Check Settings > Display, or
cat /sys/class/drm/card0-DP-1/modes: only 640x480.
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