Comment 143 for bug 614238

Forwarding this bug from Ubuntu reporter Alan Lord:
http://bugs.launchpad.net/bugs/614238

[Problem]
Output on external screen with VGA is described as having waves that makes it unusable. The problem has been observed with kernels up through and including 3.0 release candidates. This problem was also discussed on https://bugs.freedesktop.org/show_bug.cgi?id=28306, and a patch that helped was provided there (commit 633f2ea "drm/i915: Disable SSC for outputs other than LVDS or DP") but was later reverted (commit fc9a222), so the issue is still outstanding. It was requested that a new bug be opened as a result of confusion from unrelated issues.

[Original Description]
A similar problem with Lucid was reported mainly by users of ATi Radeon graphics hardware. I also experienced the "wavy" output in Lucid, although the graphics h/w is the integrated intel that comes with the Core i3 processors.

It is easy to reproduce. Just plug in an external monitor or projector. The output is not stable/solid and has waves that make it unusable.

I tried the Maverick Alpha3 to see if it had been addressed in the 2.6.35 kernel but the problem is still apparent.

The LCD display of the Laptop is rock solid and sharp. This only affects the external VGA from what I can tell. I do not have any hdmi devices to test with so cannot confirm if the symptoms are just VGA or any external monitor connection.

Similar bug reports from Lucid include: 537640, 541501, 557814, 562138 although these all seem to relate to the ATI chipsets, the description of the problem sounds the same.

I am happy to try upstream kernels and build/patch/compile if necessary.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-14-generic 2.6.35-14.19
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-14.19-generic 2.6.35
Uname: Linux 2.6.35-14-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: alord 1578 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc700000 irq 46'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:10ec0269,144dc06a,00100004 HDA:80862804,80860101,00100000'
   Controls : 19
   Simple ctrls : 9
Date: Fri Aug 6 07:47:00 2010
HibernationDevice: RESUME=UUID=bc66e046-4afc-4cb6-aa3e-d0f114e960e3
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100803.1)
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 1210:25f4 DigiTech
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: SAMSUNG ELECTRONICS CO., LTD. R530/R730
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-14-generic root=UUID=3364d8e7-11e8-4000-a32e-8bfca4cac5aa ro quiet splash
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.37
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
dmi.bios.date: 03/12/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03JV.M011.20100312.hkk
dmi.board.asset.tag: Tag 12345
dmi.board.name: R530/R730
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr03JV.M011.20100312.hkk:bd03/12/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR530/R730:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR530/R730:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: R530/R730
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.