Axel Mueller, the requested patch is available in Trusty as per
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=commit;h=051963d4832ed61e5ae74f5330b0a94489e101b9
. Please reopen if this doesn't work for you, and execute the following in a
terminal:
apport-collect 722806
** Changed in: linux (Ubuntu)
Status: Fix Committed => Invalid
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https://bugs.launchpad.net/bugs/722806
Title:
Asus M2A-VM: kernel demanding EDID for an unconnected monitor
Status in The Linux Kernel:
Fix Released
Status in “linux” package in Ubuntu:
Invalid
Status in “linux” package in Fedora:
Unknown
Bug description:
There is a problem with mainboard Asus M2A-VM. There is no HDMI monitor
connected (monitor uses DVI) but the kernel still tries to read the EDID. Thus,
dmesg is spammed every 10 seconds with this message:
[ 21.383270] [drm:drm_edid_block_valid] *ERROR* Raw EDID:
[ 21.383305] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383307] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383310] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383312] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383314] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383317] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383319] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383322] <3>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
[ 21.383324]
[ 21.383328] radeon 0000:01:05.0: HDMI-A-1: EDID block 0 invalid.
[ 21.383332] [drm:radeon_dvi_detect] *ERROR* HDMI-A-1: probed a monitor but
no|invalid EDID
X behaves very jerky because of the load caused by the kernel demanding the
EDID every 10 seconds.
For more info see https://bugzilla.redhat.com/show_bug.cgi?id=668196 and
http://ubuntuforums.org/showthread.php?t=1607778
I found three possible solutions to solve my problem:
1) disable KMS by using the kernel parameter "radeon.modeset=0"
Unfortunately, the X server will then segfault after a short time
2) get the kernel source and patch the radeon driver, see
http://ubuntuforums.org/showthread.php?t=1607778
(the patch is not from me!)
this works, but you have to patch the kernel after every update again
3) execute the command
"echo -n N > /sys/module/drm_kms_helper/parameters/poll"
This will effectively stop the pollution of the dmesg (and all the quirky X
behavior). This option does not exist in kernel 2.6.35 that's why I had update
to kernel 2.6.38
It would be fine if the kernel tries to read the EDID only once and
then stops trying if it fails (see patch from solution #2).
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