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Bug 409153

Summary: sys-kernel/gentoo-sources-3.2.1 with x11-drivers/xf86-video-ati-6.14.3 - [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 213
Product: Gentoo Linux Reporter: Raphael <raphael_s>
Component: [OLD] Core systemAssignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status: RESOLVED FIXED    
Severity: normal CC: x11
Priority: Normal    
Version: unspecified   
Hardware: AMD64   
OS: Linux   
Whiteboard:
Package list:
Runtime testing required: ---
Attachments: emerge --info

Description Raphael 2012-03-21 11:19:36 UTC
After updating Kernel from 2.6.34 to 3.2.1 the problem started. First all seems to work fine, but in KDE all 5 seconds the screen freezes for 1 second. After searching gentoo-bugs and google i found following error message with "dmesg":

------------------------------------------------------
[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 213
Raw EDID:
        00 ff ff ff ff ff ff 00 05 b7 00 00 17 04 00 00
        02 13 01 03 6e 31 1d 78 ef e5 25 a6 54 44 a1 25
        14 50 54 bf ef 00 81 80 81 8f 71 4f 95 00 95 0f
        b3 00 01 01 01 01 21 39 90 30 62 1a 27 40 50 18
        3e 11 ef 23 11 d6 ff 1c 00 00 00 fd 00 38 4c 1e
        55 13 00 0a 20 20 20 20 20 20 00 00 00 fc 00 58
        32 32 31 30 57 41 53 0a 20 20 20 20 00 00 00 ff
        00 30 30 31 30 34 37 0a 20 20 20 20 20 20 00 77
radeon 0000:06:00.0: DVI-I-1: EDID block 0 invalid.
------------------------------------------------------

This error only occurs when i connect an old monitor with vga over an adapter to my video card. If i disconnect the monitor all works fine, but when connection it starts to freeze all 5 seconds again. 

Reproducible: Always

Steps to Reproduce:
1. Compile kernel with radeon-ucode
2. Connect old vga-monitor
Comment 1 Raphael 2012-03-21 11:21:25 UTC
Created attachment 306157 [details]
emerge --info
Comment 2 Jeroen Roovers (RETIRED) gentoo-dev 2012-03-21 16:38:49 UTC
Please post your `emerge -vpq x11-drivers/xf86-video-ati' output in a comment.
Comment 3 Raphael 2012-03-21 19:16:18 UTC
ra ra # emerge -vpq x11-drivers/xf86-video-ati
[ebuild   R   ] x11-drivers/xf86-video-ati-6.14.3
Comment 4 Chí-Thanh Christopher Nguyễn gentoo-dev 2012-03-22 12:41:12 UTC
See what happens if you boot with drm_kms_helper.poll=0 kernel parameter.
Comment 5 Raphael 2012-03-26 16:42:05 UTC
This works fine! Thank you very much!! One more point for linux :) Perfect support
Comment 6 Chí-Thanh Christopher Nguyễn gentoo-dev 2012-03-26 22:21:29 UTC
This is not fixed, only worked around.
Comment 7 Mike Pagano gentoo-dev 2012-08-23 13:57:31 UTC
Workaround identified, closing.