From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 83184] New: Screen flickering at low resolution when monitor is
 attached via VGA dongle to DVI port
Date: Thu, 28 Aug 2014 08:49:04 +0000
Message-ID: <bug-83184-502@http.bugs.freedesktop.org/>
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="===============0242193928=="
Return-path: <dri-devel-bounces@lists.freedesktop.org>
Received: from culpepper.freedesktop.org (unknown [131.252.210.165])
 by gabe.freedesktop.org (Postfix) with ESMTP id 297FC6E613
 for <dri-devel@lists.freedesktop.org>; Thu, 28 Aug 2014 01:49:04 -0700 (PDT)
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>
To: dri-devel@lists.freedesktop.org
List-Id: dri-devel@lists.freedesktop.org


--===============0242193928==
Content-Type: multipart/alternative; boundary="1409215744.CcFa6C0.5503"; charset="us-ascii"


--1409215744.CcFa6C0.5503
Date: Thu, 28 Aug 2014 08:49:03 +0000
MIME-Version: 1.0
Content-Type: text/plain; charset="UTF-8"

https://bugs.freedesktop.org/show_bug.cgi?id=83184

          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
  --> https://bugs.freedesktop.org/attachment.cgi?id=105377&action=edit
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.

--1409215744.CcFa6C0.5503
Date: Thu, 28 Aug 2014 08:49:04 +0000
MIME-Version: 1.0
Content-Type: text/html; charset="UTF-8"

<html>
    <head>
      <base href="https://bugs.freedesktop.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Screen flickering at low resolution when monitor is attached via VGA dongle to DVI port"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=83184">83184</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dri-devel&#64;lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Screen flickering at low resolution when monitor is attached via VGA dongle to DVI port
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>Rainer.Koenig&#64;ts.fujitsu.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Radeon
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=105377" name="attach_105377" title="dmesg output with drm debug information">attachment 105377</a> <a href="attachment.cgi?id=105377&amp;action=edit" title="dmesg output with drm debug information">[details]</a></span>
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
&quot;conflicting encoders&quot;. Any idea what could cause this behaviour?

Regards
Rainer</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>

--1409215744.CcFa6C0.5503--

--===============0242193928==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

--===============0242193928==--