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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
        ReportedBy: samtygier at 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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