| Summary: | Screen flickering at low resolution when monitor is attached via VGA dongle to DVI port | ||||||||
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| Product: | DRI | Reporter: | Rainer König <Rainer.Koenig> | ||||||
| Component: | DRM/Radeon | Assignee: | Default DRI bug account <dri-devel> | ||||||
| Status: | RESOLVED FIXED | QA Contact: | |||||||
| Severity: | normal | ||||||||
| Priority: | medium | ||||||||
| Version: | unspecified | ||||||||
| Hardware: | x86-64 (AMD64) | ||||||||
| OS: | Linux (All) | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | i915 features: | ||||||||
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What physical connectors are actually on your board? The vbios seems to think there is a VGA port and a DVI-I port. If that does not match reality, we may need to add a quirk for your card to fix it. We have the following physical connectors on board: - 1 Display Port connector - 1 DVI-I connector (which is used with a DVI->VGA dongle when the problem occurs) - 1 DP to LVDS connector A detailled technical spec is available here: ftp://ftp.ts.fujitsu.com/pub/Mainboard-OEM-Sales/Products/Mainboards/Industrial&ExtendedLifetime/D3003-S/Documentation_D3003-S/TechNotes/TechNotes_V3.1_Mini-ITX_D3003-S.pdf Created attachment 105905 [details] [review] fix display connector configuration Does the attached patch fix the issue? The attached patch works perfect. Issue is fixed. Thanks. |
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Created attachment 105377 [details] dmesg output with drm debug information Encountered a strange problem with Radeon HD 6250 (or HD 6310) on a Fujitsu D3003-S1x mainboard. Occurs with every tested linux distribution and older and newer kernels. Problem occurs only when a monitor is attached via VGA to the DVI port. If the monitor is attached via DVI then the problem does not occur. Problem is that - Monitor is flickering sporadically - Monitor resolution is fixed to 1024x768 instead of higher resolutions that are possible - xrandr shows 2 monitors while just one monitor is attached Tried to debug this with kernel parameter drm.debug=14 (dmesg log is attached) and found the following messages that would explain the flickering screen. [ 4.098364] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off DVI-I-1 [ 4.098369] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of VGA-1 [ 4.219817] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off VGA-1 [ 4.219830] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of DVI-I-1 [ 4.231344] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off DVI-I-1 [ 4.231350] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of VGA-1 [ 13.949336] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off VGA-1 [ 13.949350] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of DVI-I-1 [ 13.967886] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off DVI-I-1 [ 13.967891] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of VGA-1 [ 14.023332] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off VGA-1 [ 14.023345] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of DVI-I-1 [ 14.056688] [drm:radeon_connector_analog_encoder_conflict_solve] 1: conflicting encoders switching off DVI-I-1 [ 14.056694] [drm:radeon_connector_analog_encoder_conflict_solve] in favor of VGA-1 The problem is still to find the root cause that leads to the issue of having "conflicting encoders". Any idea what could cause this behaviour? Regards Rainer