Bug 838265
| Summary: | EDID Checksum Error on Sony VAIO VGN-CR35G | ||||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Bertran <bertran63> | ||||||||||
| Component: | kernel | Assignee: | Adam Jackson <ajax> | ||||||||||
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||||
| Severity: | unspecified | Docs Contact: | |||||||||||
| Priority: | unspecified | ||||||||||||
| Version: | 17 | CC: | ajax, bertran63, gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda | ||||||||||
| Target Milestone: | --- | ||||||||||||
| Target Release: | --- | ||||||||||||
| Hardware: | i686 | ||||||||||||
| OS: | Linux | ||||||||||||
| Whiteboard: | |||||||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||||||
| Doc Text: | Story Points: | --- | |||||||||||
| Clone Of: | Environment: | ||||||||||||
| Last Closed: | 2013-07-31 17:47:27 UTC | Type: | Bug | ||||||||||
| Regression: | --- | Mount Type: | --- | ||||||||||
| Documentation: | --- | CRM: | |||||||||||
| Verified Versions: | Category: | --- | |||||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||||
| Embargoed: | |||||||||||||
| Attachments: |
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Created attachment 596841 [details]
lspci -vv
Created attachment 596842 [details]
Xorg.0.log
To my understanding, this is telling you the EDID information in your LCD is broken. It isn't really a kernel problem and just making it go away could be done but it wouldn't actually correct anything. Adam, is that basically correct? Hi Josh Thanks for your reply. As an ordinary user I don't really have a full understanding of EDIDs, but from what I've looked up, I understand that the checksum should add up to 0 for a valid EDID? It could be that the monitor has an invalid EDID, but, correct me if I'm wrong, in that case, shouldn't I be expecting the same, nonzero checksum result on every boot? I'm actually getting a completely different remainder with each boot, so I thought it might possibly be a problem with the way the EDID is being read. Thank you for looking into this report. Regards Bertran The error appears to be harmless, in a sense. Your X log shows you using a non-default set of video modes, which indicates that you _are_ getting EDID from somewhere, just not from the code path where that error message is triggered. This makes sense, we check for EDID in multiple places (DDC to the monitor, ACPI, magic BIOS data tables, etc) because it's not found in only one place. That said, the "EDID block" it's complaining about looks like it could be a chunk of an unrelated BIOS data table, which hints at a bug in the radeon driver's BIOS data table walk code. To verify this, please run the following commands as root: # echo 1 > /sys/bus/pci/devices/0000:01:00.0/rom # cp /sys/bus/pci/devices/0000:01:00.0/rom /tmp/rom And attach the resulting rom file to this bug. Created attachment 598742 [details]
rom dump
Hi Adam
Thanks for the explanation. Here is the rom dump.
Cheers
Bertran
This message is a reminder that Fedora 17 is nearing its end of life. Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 17. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '17'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 17's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 17 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior to Fedora 17's end of life. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. Fedora 17 changed to end-of-life (EOL) status on 2013-07-30. Fedora 17 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed. |
Created attachment 596840 [details] dmesg Description of problem: On system startup, the following lines of text flash on the screen for a split-second: [ 1.098553] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 31 [ 1.098616] Raw EDID: [ 1.098667] 36 7f 40 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.098721] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.098775] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.098829] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 1.098883] ff ff ff ff ff ff ff ff 00 00 00 00 00 00 00 00 [ 1.098937] 00 00 00 00 e0 3b 63 f4 07 00 00 00 20 e9 b5 c0 [ 1.098990] 80 e9 b5 c0 a0 3a b6 c0 80 31 6d f4 50 b6 45 c0 [ 1.099069] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.099130] [drm:radeon_atombios_get_lvds_info] *ERROR* Bad LCD record 127 The value of the remainder varies with each boot. How reproducible: 100% Steps to Reproduce: 1. Boot Fedora 17 Actual results: The abovementioned error message is displayed Expected results: No error message is displayed. Additional info: Identical problem in Fedora 16