[Bug 48357] New: Display resolutions not detected correctly after startup with VGA over DisplayPort

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48357

             Bug #: 48357
           Summary: Display resolutions not detected correctly after
                    startup with VGA over DisplayPort
    Classification: Unclassified
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: heroeschman at gmx.de


Created attachment 59545
  --> https://bugs.freedesktop.org/attachment.cgi?id=59545
dmesg

Hi.
One of my monitors is a VGA LCD connected over DisplayPort. After startup not
all resolutions are detected but only resolutions up to 1024x768. However if i
disconnect the monitor and reconnect it again (at 287.472381 in the log file)
all screen resolutions are detected correctly.

The initial detection does not work and dmesg shows
"[drm:radeon_dp_i2c_aux_ch], aux i2c too many retries, giving up"
error messages. drm_helper_probe_single_connector_modes() then falls back and
probes some modes up to 1024x768 that is why higher resolutions are missing. No
idea why it works after reconnecting the monitor.

dmesg log is "dmesg | grep drm" with drm.debug=0x0e from a 3.4-rc1 kernel but
the problem already happend in earlier versions. The problem also happens if
only the VGA monitor is connected.

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