Comment 5 for bug 547147

dmesg command shows a long list of the following messages and the system is slow:

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[ 146.763513] radeon 0000:01:00.0: VGA-1: EDID invalid.
[ 146.763526] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but no|invalid EDID
[ 146.816506] [drm:edid_is_valid] *ERROR* EDID checksum is invalid, remainder is 200
[ 146.816515] [drm:edid_is_valid] *ERROR* Raw EDID:
[ 146.816522] <3>00 ff ff ff ff ff ff 00 41 0c 09 12 d5 31 00 00 ........A....1..
[ 146.816528] <3>32 08 01 01 0e 22 1a b0 60 00 00 a0 57 49 9b 26 2...."..`...WI.&
[ 146.816533] <3>10 49 4b 24 43 80 31 4a 45 59 61 59 81 99 a9 4f .IK$C.1JEYaY...O
[ 146.816539] <3>a9 59 01 01 01 01 06 54 40 ff 61 00 3c 50 15 bd .Y.....T@.a.<P..
[ 146.816544] <3>f2 08 54 ff 10 00 00 18 00 00 00 ff 00 20 54 59 ..T.......... TY
[ 146.816550] <3>20 20 30 31 32 37 35 37 0a 20 00 00 00 fc 00 54 012757. .....T
[ 146.816555] <3>59 50 48 4f 4f 4e 31 30 39 4d 50 0a 00 00 00 fd YPHOON109MP.....
[ 146.816561] <3>00 32 a0 1e 6b ff 00 0a 20 20 20 20 20 20 00 8b .2..k... ..
[ 146.816565]
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My system is Ubuntu 10.04 Lucid Lynx:
Linux nickguest 2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:27:30 UTC 2010 i686 GNU/Linux
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]
Monitor Philips Brilliance 109MP