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.