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
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.
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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
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
May this bug has the same cause as the bug here?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/712075
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https://bugs.launchpad.net/bugs/914437
Title:
The second display works again on Ubuntu 12.10, kernel 3.5.0.
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https://bugs.launchpad.net/bugs/914437
Title:
Second display not recognized anymore; EDID checksum
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.
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High-Problem with an essential hardware component (monitor)
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided = High
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New = Confirmed
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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 ff00, however we see the first 8
bytes in the dmesg showing all 0xff. So the difference is 0xff+ 0xff =
0x1fe, but looks like
** Attachment added: read-edid | xxd
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/914437/+attachment/2689171/+files/read-edid-xxd
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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
[
The problem also occurs on the Fedora 16 live CD (kernel
3.1.0-somtething).
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https://bugs.launchpad.net/bugs/914437
Title:
Second display not recognized anymore;
Related if not the same:
https://bugzilla.redhat.com/show_bug.cgi?id=533632
** Bug watch added: Red Hat Bugzilla #533632
https://bugzilla.redhat.com/show_bug.cgi?id=533632
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** Attachment added: display settings with both monitors connected
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/914437/+attachment/2682245/+files/2012-01-19%20display%20settings.png
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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
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
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
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https://bugs.launchpad.net/bugs/914437
Title:
Second display not recognized anymore; EDID checksum is invalid
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