| Summary: | Invalid three-monitor setup configured for LVDS/DP/HDMI | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | xorg | Reporter: | Simon Richter <Simon.Richter> | ||||||
| Component: | Driver/modesetting | Assignee: | Xorg Project Team <xorg-team> | ||||||
| Status: | RESOLVED MOVED | QA Contact: | Xorg Project Team <xorg-team> | ||||||
| Severity: | normal | ||||||||
| Priority: | medium | ||||||||
| Version: | unspecified | ||||||||
| Hardware: | x86-64 (AMD64) | ||||||||
| OS: | Linux (All) | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | i915 features: | ||||||||
| Attachments: |
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Created attachment 141224 [details]
X log, three-monitor setup, DP port in DP mode (fails)
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Created attachment 141223 [details] X log, three-monitor setup, DP port in HDMI mode (works) When two external monitors supporting the same timings are connected, the driver attempts to reuse a CRTC, however this fails if one is connected via DP and the other via HDMI or DVI, as the DP link requires a different PLL setup. xrandr handles this restriction, reporting an error from the CRTC setup (the virtual CRTC 2 just reports failure), but on startup, this check is not performed properly, and the X server starts up with two usable displays and one confused monitor that will neither go to powersave nor show a picture.