2.6.35-6.9 (and newer) kernels having issues with invalid EDID info and ATI Radeon graphics
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Medium
|
|||
linux (Ubuntu) |
Fix Released
|
Medium
|
sam tygier | ||
Maverick |
Invalid
|
Medium
|
sam tygier |
Bug Description
The real reason that this only happens with newer kernels is that before:
commit 61e57a8d72f2336
Author: Adam Jackson <ajax <at> redhat.com>
Date: Mon Mar 29 21:43:18 2010 +0000
drm/edid: Fix secondary block fetch.
which reached mainline in 2.6.35, only the base block of the EDID was read. Now the extension blocks are also being read. If any of the extension blocks are invalid then the whole EDID is thrown away.
the new patch only throws away the bad extension.
there is an upstream bug at https:/
== second description ==
The kernel has become fussy about EDID information from the monitor. When using kernel mode setting (KMS) the kernel will refuse to setup a monitor with invalid EDID (even if those which worked with previous kernels).
Radeon still has user mode setting, which seems to bypass the EDID strictness. so to boot one can append the following to the grub kernel line:
radeon.modeset=0
== original description ==
i install maverick with todays live cd. after install there was a lot of updates available (including xorg and kernel). after these updates i can't boot. i get a stuck at a blank screen after grub. i can't switch VT. same happens even with recovery mode.
if i select the old kernel 2.6.34-5.14 at grub i can boot fine.
i tried to use "ubuntu-bug linux" to report the issue, but i says "This is not a genuine Ubuntu package" i guess this is because i am booted with an old kernel. so please let me know what info you might need. i'll attach syslog, because that defiantly has some interesting messages. there is a failed boot starting at Jul 3 14:32:00
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices: aplay: device_list:235: no soundcards found...
Architecture: amd64
ArecordDevices: arecord: device_list:235: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/
CRDA: Error: [Errno 2] No such file or directory
DistroRelease: Ubuntu 10.10
HibernationDevice: RESUME=
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100605)
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=
ProcEnviron:
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcVersionSign
Regression: Yes
RelatedPackageV
Reproducible: Yes
RfKill:
Tags: maverick graphics regression-
Uname: Linux 2.6.35-7-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 11/07/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: S2696
dmi.board.vendor: Tyan Computer Corporation
dmi.chassis.type: 6
dmi.modalias: dmi:bvnPhoenixT
affects: | ubuntu → linux (Ubuntu) |
tags: | added: kj-triage |
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
description: | updated |
tags: | added: patch |
description: | updated |
Changed in linux: | |
status: | Unknown → Fix Released |
Changed in linux: | |
importance: | Unknown → Medium |
apport information