Second display not recognized anymore; "EDID checksum is invalid"

[Christian Weiske]

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

[Chris J Arges (arges)]

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.

[Christian Weiske (cweiske)]

Booting the system with both displays attached shows only the working monitor in the display settings.

When booting the system with only the non-working monitor attached actually shows the desktop on the non-working display, but in a wrong resolution - and the display settings application does not show any monitor at all (see screenshots).

[Christian Weiske (cweiske)]

This still happens on today's live cd/usb of 12.04 (precise):

[ 66.354209] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 254
[ 66.354211] Raw EDID:
[ 66.354212] ff ff ff ff ff ff ff ff 4d d9 50 1e 01 01 01 01
[ 66.354213] 01 0c 01 02 0e 1e 17 78 ea 7e a9 a0 58 4e 96 25
[ 66.354215] 1e 48 4c a1 08 00 01 01 01 01 01 01 01 01 01 01
[ 66.354216] 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88
[ 66.354218] 36 00 30 e4 10 00 00 18 00 00 00 fd 00 30 41 1c
[ 66.354219] 3d 0a 00 0a 20 20 20 20 20 20 00 00 00 fc 00 53
[ 66.354221] 44 4d 2d 53 35 31 0a 20 20 20 20 20 00 00 00 ff
[ 66.354222] 00 34 35 32 37 39 35 35 0a 20 20 20 20 20 00 97
[ 66.354224] radeon 0000:01:00.0: DVI-I-2: EDID block 0 invalid.
[ 66.354226] [drm:radeon_dvi_detect] *ERROR* DVI-I-2: probed a monitor but no|invalid EDID
[ 66.406913] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 254

[Christian Weiske (cweiske)]

The problem also occurs on the Fedora 16 live CD (kernel 3.1.0-somtething).

[Christian Weiske (cweiske)]

Related if not the same: https://bugzilla.redhat.com/show_bug.cgi?id=533632

[Chris J Arges (arges)]

This looks like potentially the EDID is corrupted. According to http://en.wikipedia.org/wiki/Extended_display_identification_data the first 8 bytes should be 00ff ffff ffff ff00, however we see the first 8 bytes in the dmesg showing all 0xff. So the difference is 0xff+ 0xff = 0x1fe, but looks like the remainder is only a char, so we get 0xfe or 254.

1) You can verify the EDID using the read-edid package. Then running 'sudo get-edid | xxd' to check. In addition 'sudo get-edid > parse-edid' will give you mode information that may be helpful as well. Can you paste that info into the bug?

2) It would be good to check that the monitor works in 11.04 and see what the dmesgs show. I wonder if we're getting the same messages about EDID or any messages such as 'Fixing EDID header, your hardware may be failing.', please attach this information as well.

[Christian Weiske (cweiske)]

get-edid does not show the EDID of the monitor with the broken EDID.

Booting 11.04, the monitor *works fine*. Nontheless dmesg shows the following, which is nearly the same as on 11.10 and 12.04:

[ 39.328047] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 254
[ 39.328048] [drm:drm_edid_block_valid] *ERROR* Raw EDID:
[ 39.328050] <3>ff ff ff ff ff ff ff ff 4d d9 50 1e 01 01 01 01 ........M.P.....
[ 39.328052] <3>01 0c 01 02 0e 1e 17 78 ea 7e a9 a0 58 4e 96 25 .......x.~..XN.%
[ 39.328053] <3>1e 48 4c a1 08 00 01 01 01 01 01 01 01 01 01 01 .HL.............
[ 39.328055] <3>01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88 ......d..@A.&0..
[ 39.328056] <3>36 00 30 e4 10 00 00 18 00 00 00 fd 00 30 41 1c 6.0..........0A.
[ 39.328058] <3>3d 0a 00 0a 20 20 20 20 20 20 00 00 00 fc 00 53 =... .....S
[ 39.328060] <3>44 4d 2d 53 35 31 0a 20 20 20 20 20 00 00 00 ff DM-S51. ....
[ 39.328061] <3>00 34 35 32 37 39 35 35 0a 20 20 20 20 20 00 97 .4527955. ..
[ 39.328062]
[ 39.328065] radeon 0000:01:00.0: DVI-I-2: EDID block 0 invalid.
[ 39.328067] [drm:radeon_dvi_detect] *ERROR* DVI-I-2: probed a monitor but no|invalid EDID

I don't see any "your hardware may be failing" message, neither a "fixing edid header" one. The resolutions in the display settings manager are detected nontheless - see screenshot display-settings-11.04.png

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dave Gilbert (ubuntu-treblig)]

High->Problem with an essential hardware component (monitor)

[Tpugliese (thomas-pugliese)]

I have an ATI Radeon HD3450 (RV620) that shows this issue but if I go back to my older Radeon X1300, both monitors work fine and no EDID errors appear in the kernel log.

[Benji (benjim)]

I have a laptop. As soon as I connect my external monitor via HDMI, dmesg provides the following error:

[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 254
Raw EDID:
    ff ff ff ff ff ff ff ff 1a b3 45 07 01 01 01 01
   21 11 01 03 80 2f 1e 82 2a ee 95 a3 54 4c 99 26
   0f 50 54 a5 4b 00 95 0f 81 80 81 40 71 4f 95 00
   b3 00 81 c0 01 01 21 39 90 30 62 1a 27 40 68 b0
   36 00 da 28 11 00 00 1c 00 00 00 ff 00 59 45 33
   4c 30 31 30 32 36 33 0a 20 20 00 00 00 fd 00 38
   4b 1f 53 0f 00 0a 20 20 20 20 20 20 00 00 00 fc
   00 58 32 32 57 2d 31 0a 20 20 20 20 20 20 00 53
i915 0000:00:02.0: HDMI-A-1: EDID block 0 invalid.

When I connect the external monitor via VGA, it works fine.
The external monitor also used to work fine via HDMI/DVI quite some time ago.

xrandr has the following output (the external monitor in connected by VGA and also by HDMI/DVI):

Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 214mm
   1600x900 60.0*+
   1440x900 59.9
   1360x768 59.8 60.0
   1152x864 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
VGA1 connected (normal left inverted right x axis y axis)
   1680x1050 60.0 +
   1280x1024 75.0 60.0
   1440x900 75.0 59.9
   1280x960 60.0
   1152x864 75.0
   1280x720 60.0
   1024x768 75.1 60.0
   800x600 75.0 60.3
   640x480 75.0 60.0
   720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)

So I can't even active the monitor by HDMI (xrandr --output HDMI1 --auto hs no effect).

As anyone found a workaround?

[Benji (benjim)]

May this bug has the same cause as the bug here?

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/712075

[Christian Weiske (cweiske)]

The second display works again on Ubuntu 12.10, kernel 3.5.0.

[penalvch (penalvch)]

Christian Weiske, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p xserver-xorg-video-ati REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is already available, doing this on a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Christian Weiske (cweiske)]

If you had read my last comment, you would have noticed that the issue has been resolved already. I could not close it unfortunately, because I don't see a close button.

[penalvch (penalvch)]

Christian Weiske, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/914437/comments/18 regarding this being resolved. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.