| Priority | medium |
|---|---|
| Bug ID | 83184 |
| Assignee | dri-devel@lists.freedesktop.org |
| Summary | Screen flickering at low resolution when monitor is attached via VGA dongle to DVI port |
| Severity | normal |
| Classification | Unclassified |
| OS | Linux (All) |
| Reporter | Rainer.Koenig@ts.fujitsu.com |
| Hardware | x86-64 (AMD64) |
| Status | NEW |
| Version | unspecified |
| Component | DRM/Radeon |
| Product | DRI |
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
You are receiving this mail because:
- You are the assignee for the bug.
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
