[Bug 264632] drm/edid: Fix parsing of EDID 1.4 Established Timings III descriptor

Reply: bugzilla-noreply_a_freebsd.org: "[Bug 264632] drm/edid: Fix parsing of EDID 1.4 Established Timings III descriptor"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 12 Jun 2022 13:05:40 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264632

            Bug ID: 264632
           Summary: drm/edid: Fix parsing of EDID 1.4 Established Timings
                    III descriptor
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: xiaohuizhang@ruc.edu.cn

Created attachment 234639
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234639&action=edit
a possible patch

The EDID 1.4 specification section 3.10.3.9 defines an Established Timings III 
descriptor (tag #F7h). The parsing of this descriptor by drm_est3_modes() is
off by one byte: the offset of the first timing bitmap is 6, not 5.

The similar bug has been fixed in linux (commit f3a32d74ef73).

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