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    SubjectRe: [PATCH] drm/radeon: Fix Asus M2A-VM HDMI EDID error flooding problem
    On Wed, Jul 6, 2011 at 11:39 AM, Alex Deucher <> wrote:
    > On Wed, Jul 6, 2011 at 6:09 AM,  <> wrote:
    >> From: Thomas Reim <>
    >>    Some integrated ATI Radeon chipset implementations
    >>    with add-on HDMI card (e. g. Asus M2A-VM HDMI) indicate the availability
    >>    of a DDC even when the add-on card is not plugged in or HDMI is disabled
    >>    in BIOS setup. In this case, drm_get_edid() and drm_edid_block_valid()
    >>    periodically dump data and kernel errors into system log files and onto
    >>    terminals. For these chipsets DDC probing is extended by a check for a
    >>    correct EDID header. Only in case a valid EDID header is also found, the
    >>    (HDMI) connector will be used by the Radeon driver. This prevents the
    >>    kernel driver from useless flooding of logs and terminal sessions with
    >>    EDID dumps and error messages.
    >>    This patch adds a flag 'requires_extended_probe' to the radeon_connector
    >>    structure. In function radeon_connector_needs_extended_probe() this flag
    >>    can be set on a chipset family/vendor/connector type specific basis.
    >>    In addition, function drm_edid_header_is_valid() has been added for EDID
    >>    header check and function radeon_ddc_probe() has been adapted to perform
    >>    extended DDC probing if required by the connector's flag.
    >>    Tested for kernel 2.35, 2.38 and 3.0 on Asus M2A-VM HDMI board
    > Once it's ready, just add:
    > Cc:
    > to the commit message and it will go into the stable kernels as well.
    > Might want to mention the bug report in your commit message as well.
    > Just a couple comments below.  With those fixed:
    > Reviewed-by: Alex Deucher <>

    We also may want to revert 4a9a8b71e12d41abb71c4e741bff524f016cfef4
    once this patch goes in, otherwise we may remove the ddc bus
    unnecessarily on some systems.

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