[Bug 42112] New: radeon driver (kms) fails to read EDID data from external LCD monitor with kernel 3.0.4 on a RV350 chip
https://bugzilla.kernel.org/show_bug.cgi?id=42112
Summary: radeon driver (kms) fails to read EDID data from external LCD monitor with kernel 3.0.4 on a RV350 chip Product: Drivers Version: 2.5 Kernel Version: 3.0.4 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) AssignedTo: drivers_video-dri@kernel-bugs.osdl.org ReportedBy: mrsteven@gmx.de Regression: Yes
Created an attachment (id=70922) --> (https://bugzilla.kernel.org/attachment.cgi?id=70922) Output of lspci -vv
Hello,
today I updated from kernel 3.0.3 to 3.0.4. Now when I plug an external LCD monitor into the VGA output of my notebook, the radeon driver fails to read the EDID data from the monitor, leading to a resolution of 1024x768 instead of 1280x1024 on it. With kernel 3.0.3 everything worked fine.
Now when I execute the following command in an X session xrandr --output VGA-0 --auto my dmesg output shows these lines:
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
radeon 0000:01:00.0: VGA-1: EDID block 0 invalid. [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but no|invalid EDID [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 238 Raw EDID: <3>00 ff ff ff ff ff ff 00 26 34 75 01 ec 37 00 00 ........&4u..7.. <3>12 0f 01 03 08 21 1b 78 e8 c5 c6 a3 57 4a 9c 23 .....!.x....WJ.# <3>00 4f 54 a7 ef 80 81 80 01 01 01 01 01 01 01 01 .OT............. <3>01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 ......0*..Q.*@0p <3>13 00 4a 0e 11 00 00 1e 10 0b d0 b4 20 90 31 10 ..J......... .1. <3>12 6c d2 00 4a 0e 11 00 00 1c d5 09 80 a0 20 e0 .l..J......... . <3>2d 10 10 60 a2 00 4a 0e 11 00 00 18 00 00 00 fc -..`..J......... <3>00 4c 31 37 54 0a 20 20 20 20 20 20 20 20 00 ba .L17T. ..
radeon 0000:01:00.0: VGA-1: EDID block 0 invalid.
The monitor in question is a Hyundai ImageQuest L17T. Note that the internal LVDS still works fine.
https://bugzilla.kernel.org/show_bug.cgi?id=42112
--- Comment #1 from mrsteven@gmx.de 2011-08-30 19:15:13 --- Created an attachment (id=70932) --> (https://bugzilla.kernel.org/attachment.cgi?id=70932) Kernel log of me playing around with the external monitor
I was trying to set the external monitor to its native resolution and to add it as a second monitor right of the internal notebook display. The latter worked, but setting the native resolution failed without proper EDID information.
https://bugzilla.kernel.org/show_bug.cgi?id=42112
Alex Deucher alexdeucher@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com
--- Comment #2 from Alex Deucher alexdeucher@gmail.com 2011-08-30 19:42:14 --- Can you bisect?
https://bugzilla.kernel.org/show_bug.cgi?id=42112
--- Comment #3 from mrsteven@gmx.de 2011-08-30 20:11:29 --- Hmm, my internet connection is quite slow, but I hope it will work if I clone the stable tree with a line like this:
git clone --depth=100 git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-3.0.y.git
https://bugzilla.kernel.org/show_bug.cgi?id=42112
mrsteven@gmx.de changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |INVALID
--- Comment #4 from mrsteven@gmx.de 2011-08-30 20:29:42 --- Oh, it seems I have to apologize for my noise, because the problem was the monitor itself: It somehow got confused and "forgot" its EDID data. The problem was fixed by pulling its power line and then plugging it in again, i.e. doing a hard reset of the monitor.
And yes, this makes perfect sense, because I see no commit relating to EDID reading, parsing, or the handling of the data in the radeon driver. The only one I see is a change for some HDMI connectors, which doesn't affect me.
Sorry for any inconvenience.
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