[Bug 38364] New: Ignoring invalid EDID block 1 do entire edid is invalid and not just block 1

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38364

           Summary: Ignoring invalid EDID block 1 do entire edid is
                    invalid and not just block 1
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: General
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: zaverel@free.fr


Hello ,

All is fine except i can't change resolution on my second monitor vga
,tv in fact, (reported as DVI-I-2 ) anymore with my 9400gt.


Now , i'm on :

linux-2.6.39-gentoo-r1
xorg-server-1.10.2
xf86-video-nouveau-0.0.16_pre20110323
libdrm-2.4.25

Errors in dmesg  are:

nouveau 0000:02:00.0: DVI-I-2: Ignoring invalid EDID block 1.
[drm:drm_edid_block_valid] *ERROR* Raw EDID:
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................




whatever i valid with xrandr is not really do on my tv
although xrandr say it's good , my tv always report 1202x670 50hz

I tried with and without xorg.conf

My last kernel working is linux-2.6.36-gentoo-r6.



If, i tweak drm_edid.c from kernel-2.6.39-gentoo-r1 like this:

--- drm_edid.c    2011-06-10 22:37:36.605848000 +0200
+++ linux/drivers/gpu/drm/drm_edid.c    2011-06-13 13:04:43.136786102 +0200
@@ -292,7 +292,7 @@
                   block + (valid_extensions + 1) * EDID_LENGTH,
                   j, EDID_LENGTH))
                 goto out;
-            if (drm_edid_block_valid(block + (valid_extensions + 1) *
EDID_LENGTH)) {
+            if (drm_edid_block_valid(block + (valid_extensions + 0) *
EDID_LENGTH)) {
                 valid_extensions++;
                 break;
             }

  that work good  like before but i'm not sure that is safe.

More info in 
http://lists.freedesktop.org/archives/nouveau/2011-June/008548.html

I can post logs here too , just tell me.

See you

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