Public bug reported:
After upgrading from Ubuntu 11.04 to 11.10, the second display is not
recognized anymore.
It's an amd64 system with a Radeon HD 5700 graphics card.
The first display, a Samsung P2250, connected via DVI, is recognized flawlessly.
The second display, a Sony SDM-S51, connected with a VGA cable and a
VGA-to-DVI-converter, is not recognized anymore.
dmesg is full of the following message:
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 254
...
radeon 0000:01:00.0: DVI-I-2: EDID block 0 invalid.
[drm:radeon_dvi_detect] *ERROR* DVI-I-2: probed a monitor but no|invalid EDID
I verified this bug on a completely new system (clean install, all
updates). Also reported as #24752 on landscape.canonical.com (" Second
display not recognized anymore").
Full error message:
[ 24.032103] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 254
[ 24.032104] Raw EDID:
[ 24.032106] <3>ff ff ff ff ff ff ff ff 4d d9 50 1e 01 01 01 01
........M.P.....
[ 24.032107] <3>01 0c 01 02 0e 1e 17 78 ea 7e a9 a0 58 4e 96 25
.......x.~..XN.%
[ 24.032109] <3>1e 48 4c a1 08 00 01 01 01 01 01 01 01 01 01 01
.HL.............
[ 24.032110] <3>01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88
......d..@A.&0..
[ 24.032112] <3>36 00 30 e4 10 00 00 18 00 00 00 fd 00 30 41 1c
6.0..........0A.
[ 24.032113] <3>3d 0a 00 0a 20 20 20 20 20 20 00 00 00 fc 00 53 =...
.....S
[ 24.032115] <3>44 4d 2d 53 35 31 0a 20 20 20 20 20 00 00 00 ff DM-S51.
....
[ 24.032116] <3>00 34 35 32 37 39 35 35 0a 20 20 20 20 20 00 97 .4527955.
..
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xserver-xorg-video-radeon 1:6.14.99~git20110811.g93fc084-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins:
[core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,move,mousepoll,gnomecompat,snap,vpswitch,regex,grid,place,imgpng,wall,session,unitymtgrabhandles,animation,expo,workarounds,ezoom,fade,scale,unityshell]
CompositorRunning: compiz
Date: Tue Jan 10 20:07:50 2012
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
ATI Technologies Inc Juniper [Radeon HD 5700 Series] [1002:68b8] (prog-if 00
[VGA controller])
Subsystem: ATI Technologies Inc Device [1002:e147]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: System manufacturer System Product Name
ProcEnviron:
PATH=(custom, no hostname)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-generic
root=UUID=e0b8bb68-56f0-4c33-befc-c54dae6338e6 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-ati
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/07/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0602
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A785TD-V EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0602:bd01/07/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785TD-VEVO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:0.0.16+git20110411+8378443-1
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug compiz-0.9 oneiric running-unity ubuntu
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https://bugs.launchpad.net/bugs/914437
Title:
Second display not recognized anymore; "EDID checksum is invalid"
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