radeon KMS: jittery output with dual head

[Pavel Rojtberg]

using radeon KMS I get jittery/ wavy output on the external monitor(photo). It seems like the DAC or something is not configured correctly. Booting with nomodeset resolves this issue. So I guess it is just some quirk missing in the kernel DRM.
Note that the logs were created while booted with nomodeset.

ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: pavel 1559 F.... pulseaudio
 /dev/snd/controlC0: pavel 1559 F.... pulseaudio
 /dev/snd/pcmC0D0p: pavel 1559 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xee400000 irq 17'
   Mixer name : 'Analog Devices AD1981'
   Components : 'HDA:11d41981,17aa2025,00100200'
   Controls : 20
   Simple ctrls : 11
Card1.Amixer.info:
 Card hw:1 'U0x46d0x8da'/'USB Device 0x46d:0x8da at usb-0000:00:1d.2-1, full speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:08da'
   Controls : 3
   Simple ctrls : 2
Date: Fri Mar 19 12:41:30 2010
DistroRelease: Ubuntu 10.04
Frequency: Once a day.
HibernationDevice: RESUME=UUID=52312151-e549-443c-bd19-39438aa7bda5
MachineType: LENOVO 2007FVG
Package: linux-image-2.6.32-16-generic 2.6.32-16.25
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-16-generic root=UUID=676597c8-7f07-49ee-a686-91e35e29a053 ro quiet splash nomodeset
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
Regression: Yes
RelatedPackageVersions: linux-firmware 1.32
Reproducible: No
SourcePackage: linux
TestedUpstream: No
Uname: Linux 2.6.32-16-generic i686
WpaSupplicantLog:

dmi.bios.date: 09/12/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 79ETE3WW (2.23 )
dmi.board.name: 2007FVG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr79ETE3WW(2.23):bd09/12/2008:svnLENOVO:pn2007FVG:pvrThinkPadT60p:rvnLENOVO:rn2007FVG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2007FVG
dmi.product.version: ThinkPad T60p
dmi.sys.vendor: LENOVO

[Pavel Rojtberg (rojtberg)]

problem fixed with linux 2.6.34-rc3. So it should be not an issue with maverick any more. But maybe you still want to backport the fix for lucid.

[Alan Lord (theopensourcerer)]

I have a Samsung R530 new laptop with the intel core i3 (integrated graphics) and experience the external vga port wobble too. Have commented on here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/539350 and here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/562138/comments/42

Am today running the 2.6.34-020634rc6-generic kernel and still seeing the same problem.

[Øyvind Stegard (oyvindstegard)]

Seeing this problem on kernel 2.6.32-23-generic #37~pre201006041000 as well (-23 pre-proposed from kernel-ppa), so not fixed there. External monitor through RGB port is unusable with KMS (wavy picture). Tested with 32' LCD TV (type, frequency and resolution are all correctly detected). ATI X1400 mobile.

[Leann Ogasawara (leannogasawara)]

As noted by the original bug reporter, this issue was noted as being resolved with the 2.6.34-rc3 mainline kernel. The actively developed Maverick kernel is currently based on the latest 2.6.35-rc5 mainline kernel, this this issue should no longer be an issue for Maverick. As a result, I'm marking this Fix Released. If a specific patch can be isolated to be considered for backporting to Lucid, this could possibly be considered for a Stable Release Update to Lucid, but that depends solely on the nature of the patch. If anyone else is still experiencing issues with the latest Maverick kernel, please open a new bug. Thanks.