Second display not recognized anymore; "EDID checksum is invalid"
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
xserver-xorg-video-ati (Ubuntu) |
Invalid
|
Low
|
Unassigned |
Bug Description
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-
dmesg is full of the following message:
[drm:drm_
...
radeon 0000:01:00.0: DVI-I-2: EDID block 0 invalid.
[drm:radeon_
I verified this bug on a completely new system (clean install, all updates). Also reported as #24752 on landscape.
Full error message:
[ 24.032103] [drm:drm_
[ 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-
ProcVersionSign
Uname: Linux 3.0.0-14-generic x86_64
.tmp.unity.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: [core,bailer,
CompositorRunning: compiz
Date: Tue Jan 10 20:07:50 2012
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingI
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=
SourcePackage: xserver-
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.
dmi.board.name: M4A785TD-V EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: System Product Name
dmi.product.
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.6+
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.
version.
version.
version.
version.
version.
version.
version.
Looks like this could be related to: https:/ /bugzilla. redhat. com/show_ bug.cgi? id=668196
I tried this on my own Radeon HD 4870 running on Ubuntu 11.10. I have two of the same monitors Samsung 204B. One cable is DVI and the other is DVI->VGA adapter, and VGA cable into the monitor. After plugging this in, I launched the gnome Displays settings and was able to apply the new settings and get this setup to work.