[Bug 31154] New: EIZO S2242W has invalid extension block, no display

[Bug 31154] New: EIZO S2242W has invalid extension block, no display

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31154

           Summary: EIZO S2242W has invalid extension block, no display
           Product: DRI
           Version: unspecified
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: samtygier@yahoo.co.uk


i have a EIZO S2242W display, and radeon HD3650

with 2.6.34 it worked fine. only the base block of the EDID was read:
    EDID:
        00ffffffffffff0015c3042001010101
        1113010380301e78eaf5c5a85337ae25
        125054a10800a94081808140b3000101
        010101010101283c80a070b023403020
        3600da291100001a000000ff00323530
        32363034390a20202020000000fd003b
        3d1f4c11000a202020202020000000fc
        005332323432570a2020202020200154

since 2.6.35 (i noticed at rc4) it will not display to the monitor past very
early boot messages. X wont display, neither will VTs. this is because
drm_edid.c now reads extension blocks, and the EZIO gives a block of zeros for
the extension block.

kernel: [    6.371608] [drm:drm_edid_block_valid] *ERROR* Raw EDID:
kernel: [    6.371644] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371646] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371648] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371650] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371652] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371654] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371656] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371658] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
kernel: [    6.371660] 
kernel: [    6.371664] radeon 0000:08:00.0: DVI-I-1: EDID block 1 invalid.

booting with radeon.modeset=0 seems to by pass this so that i have a working
system.

i have bisected the change to:
61e57a8d72f2336faf39b5d940215cf085e01e6e is the first bad commit
commit 61e57a8d72f2336faf39b5d940215cf085e01e6e
Author: Adam Jackson <ajax <at> redhat.com>
Date:   Mon Mar 29 21:43:18 2010 +0000
 drm/edid: Fix secondary block fetch.

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[Bug 31154] EIZO S2242W has invalid extension block, no display

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31154

--- Comment #1 from sam tygier <samtygier@yahoo.co.uk> 2010-10-27 01:39:12 PDT ---
there is some discussion at
http://thread.gmane.org/gmane.comp.video.dri.devel/50127

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[Bug 31154] EIZO S2242W has invalid extension block, no display

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31154

--- Comment #2 from sam tygier <samtygier@yahoo.co.uk> 2010-10-27 01:40:35 PDT ---
Created an attachment (id=39803)
 View: https://bugs.freedesktop.org/attachment.cgi?id=39803
 Review: https://bugs.freedesktop.org/review?bug=31154&attachment=39803

0001-DRM-ignore-invalid-EDID-extensions.patch

this patch skips over invalid extension blocks, allowing the valid base block
to be returned, and my monitor to work.

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[Bug 31154] EIZO S2242W has invalid extension block, no display

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https://bugs.freedesktop.org/show_bug.cgi?id=31154

--- Comment #3 from sam tygier <samtygier@yahoo.co.uk> 2010-10-28 15:36:56 PDT ---
tested with fresh torvalds/linux-2.6.git kernel,
81280572ca6f54009edfa4deee563e8678784218

the issue is still present, and the patch still applies cleanly and fixes it.

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[Bug 31154] EIZO S2242W has invalid extension block, no display

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https://bugs.freedesktop.org/show_bug.cgi?id=31154

--- Comment #4 from sam tygier <samtygier@yahoo.co.uk> 2010-11-03 04:37:52 PDT ---
https://bugs.launchpad.net/linux/+bug/601376/comments/44 seems to be the same
issue on nvidia card, with a different monitor

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[Bug 31154] EIZO S2242W has invalid extension block, no display

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https://bugs.freedesktop.org/show_bug.cgi?id=31154

sam tygier <samtygier@yahoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #5 from sam tygier <samtygier@yahoo.co.uk> 2010-11-13 11:10:12 PST ---
i confirmed that this is fixed in linus' tree by the recent dri merge.

commit is 0ea75e23356f73b4300492e04a62c90787a55c2d

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