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[Bug 680085] Screen blanks while working, EDID checksum error in log

https://bugzilla.novell.com/show_bug.cgi?id=680085

https://bugzilla.novell.com/show_bug.cgi?id=680085#c11


--- Comment #11 from Joschi Brauchle <joschibrauchle@xxxxxx> 2011-03-29
08:07:29 UTC ---
I turned on drm debugging via "drm.debug=0x06" and got a little more detail:
------
Mar 29 09:53:41 tm kernel: [52202.024240] [drm:intel_sdvo_debug_write], SDVOB:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:41 tm kernel: [52202.028840] [drm:intel_sdvo_read_response],
SDVOB: R: (Success) 01 00
Mar 29 09:53:41 tm kernel: [52202.032242] [drm:intel_sdvo_detect], SDVO
response 1 0 [1]
Mar 29 09:53:41 tm kernel: [52202.032247] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:41 tm kernel: [52202.038037] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:41 tm kernel: [52202.086011] [drm:intel_crt_detect], CRT not
detected via hotplug
Mar 29 09:53:41 tm kernel: [52202.086014] [drm:output_poll_execute],
[CONNECTOR:5:VGA-1] status updated from 2 to 2
Mar 29 09:53:41 tm kernel: [52202.086017] [drm:intel_sdvo_debug_write], SDVOB:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:41 tm kernel: [52202.088083] [drm:intel_sdvo_write_cmd], I2c
transfer returned -6
Mar 29 09:53:41 tm kernel: [52202.088086] [drm:output_poll_execute],
[CONNECTOR:8:DVI-D-1] status updated from 1 to 3
Mar 29 09:53:41 tm kernel: [52202.088089] [drm:intel_sdvo_debug_write], SDVOC:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:41 tm kernel: [52202.090152] [drm:intel_sdvo_write_cmd], I2c
transfer returned -6
Mar 29 09:53:41 tm kernel: [52202.090155] [drm:output_poll_execute],
[CONNECTOR:10:DVI-D-2] status updated from 2 to 3
Mar 29 09:53:41 tm kernel: [52202.092102] [drm:drm_edid_block_valid] *ERROR*
EDID checksum is invalid, remainder is 92
Mar 29 09:53:41 tm kernel: [52202.092104] [drm:drm_edid_block_valid] *ERROR*
Raw EDID:
Mar 29 09:53:41 tm kernel: [52202.092107] <3>00 ff ff ff ff ff ff 00 1a b3 52
05 2c d0 07 00 ..........R.,...
Mar 29 09:53:41 tm kernel: [52202.092109] <3>1b 11 01 03 80 26 1e 78 2a ee 95
a3 54 4c 99 26 .....&.x*...TL.&
Mar 29 09:53:41 tm kernel: [52202.092111] <3>0f 50 54 a5 4b 00 81 80 01 01 01
01 01 01 01 01 .PT.K...........
Mar 29 09:53:41 tm kernel: [52202.092113] <3>01 01 01 01 01 01 30 2a 00 98 51
00 2a 40 30 70 ......0*..Q.*@0p
Mar 29 09:53:41 tm kernel: [52202.092115] <3>13 00 78 2d 11 00 00 1e 00 00 00
fd 00 38 4c 1e ..x-.........8L.
Mar 29 09:53:41 tm kernel: [52202.092117] <3>52 0e 00 0a 20 20 20 20 20 20 00
00 00 fc 00 50 R... .....P
Mar 29 09:53:41 tm kernel: [52202.092118] <3>31 39 2d 32 0a 20 20 20 20 20 20
20 00 00 00 ff 19-2. ....
Mar 29 09:53:41 tm kernel: [52202.092120] <3>01 80 ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ................
Mar 29 09:53:41 tm kernel: [52202.092122]
Mar 29 09:53:41 tm kernel: [52202.092123] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:41 tm kernel: [52202.146071] [drm:intel_sdvo_debug_write], SDVOC:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:41 tm kernel: [52202.150644] [drm:intel_sdvo_read_response],
SDVOC: R: (Success) 00 00
Mar 29 09:53:41 tm kernel: [52202.154019] [drm:intel_sdvo_detect], SDVO
response 0 0 [1]
Mar 29 09:53:41 tm kernel: [52202.160037] [drm:intel_crt_detect], CRT not
detected via hotplug
Mar 29 09:53:41 tm kernel: [52202.160436] [drm:intel_sdvo_debug_write], SDVOB:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:41 tm kernel: [52202.165024] [drm:intel_sdvo_read_response],
SDVOB: R: (Success) 01 00
Mar 29 09:53:41 tm kernel: [52202.168397] [drm:intel_sdvo_detect], SDVO
response 1 0 [1]
Mar 29 09:53:41 tm kernel: [52202.168400] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:41 tm kernel: [52202.174171] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:41 tm kernel: [52202.228104] [drm:intel_sdvo_debug_write], SDVOC:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:41 tm kernel: [52202.232676] [drm:intel_sdvo_read_response],
SDVOC: R: (Success) 00 00
Mar 29 09:53:41 tm kernel: [52202.236050] [drm:intel_sdvo_detect], SDVO
response 0 0 [1]
Mar 29 09:53:41 tm kernel: [52202.242037] [drm:intel_crt_detect], CRT not
detected via hotplug
Mar 29 09:53:51 tm kernel: [52212.134016] [drm:intel_crt_detect], CRT not
detected via hotplug
Mar 29 09:53:51 tm kernel: [52212.134022] [drm:output_poll_execute],
[CONNECTOR:5:VGA-1] status updated from 2 to 2
Mar 29 09:53:51 tm kernel: [52212.134028] [drm:intel_sdvo_debug_write], SDVOB:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:51 tm kernel: [52212.138627] [drm:intel_sdvo_read_response],
SDVOB: R: (Success) 01 00
Mar 29 09:53:51 tm kernel: [52212.142017] [drm:intel_sdvo_detect], SDVO
response 1 0 [1]
Mar 29 09:53:51 tm kernel: [52212.142022] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:51 tm kernel: [52212.147821] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:51 tm kernel: [52212.201919] [drm:output_poll_execute],
[CONNECTOR:8:DVI-D-1] status updated from 3 to 1
Mar 29 09:53:51 tm kernel: [52212.201924] [drm:intel_sdvo_debug_write], SDVOC:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:51 tm kernel: [52212.206513] [drm:intel_sdvo_read_response],
SDVOC: R: (Success) 00 00
Mar 29 09:53:51 tm kernel: [52212.209905] [drm:intel_sdvo_detect], SDVO
response 0 0 [1]
Mar 29 09:53:51 tm kernel: [52212.209909] [drm:output_poll_execute],
[CONNECTOR:10:DVI-D-2] status updated from 3 to 2
Mar 29 09:53:51 tm kernel: [52212.211953] [drm:intel_sdvo_debug_write], SDVOB:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:51 tm kernel: [52212.216525] [drm:intel_sdvo_read_response],
SDVOB: R: (Success) 01 00
Mar 29 09:53:51 tm kernel: [52212.219900] [drm:intel_sdvo_detect], SDVO
response 1 0 [1]
Mar 29 09:53:51 tm kernel: [52212.219903] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:51 tm kernel: [52212.225675] [drm:intel_sdvo_debug_write], SDVOB:
W: 7A 02 (SDVO_CMD_SET_CONTROL_BUS_SWITCH)
Mar 29 09:53:51 tm kernel: [52212.279601] [drm:intel_sdvo_debug_write], SDVOC:
W: 0B (SDVO_CMD_GET_ATTACHED_DISPLAYS)
Mar 29 09:53:51 tm kernel: [52212.284181] [drm:intel_sdvo_read_response],
SDVOC: R: (Success) 00 00
Mar 29 09:53:51 tm kernel: [52212.287553] [drm:intel_sdvo_detect], SDVO
response 0 0 [1]
Mar 29 09:53:51 tm kernel: [52212.293038] [drm:intel_crt_detect], CRT not
detected via hotplug
------

The status of CONNECTOR:8:DVI-D-1 is usually equal to 1, but for whatever
reason at this time it changes to 3 after an "I2c transfer returned -6"
message. 10 seconds later the status value returns to 1 again. The screen did
not blank during this phase.

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