Intel Core i3 External Monitor Wavy Output
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Medium
|
|||
linux (Ubuntu) |
Fix Released
|
Medium
|
Seth Forshee | ||
Natty |
Invalid
|
Medium
|
Seth Forshee | ||
Oneiric |
Fix Released
|
High
|
Seth Forshee | ||
Precise |
Fix Released
|
Medium
|
Seth Forshee |
Bug Description
== SRU Justification ==
Impact: On some machines with an Ibex Peak PCH, SSC will be enabled on the clock source used for analog outputs. This results in poor quality output (described as "wavy") on the external display.
Fix: A series of upstream backports to the i915 driver. With these backports, i915 will check for the existence of a CK505 clock source, and if present this is used as the clock source for analog outputs so that SSC can remain enabled. Otherwise SSC is disabled. The PCH refclk update code is also split out so that it can be called from additional locations where the refclks should be updated.
Test Case: Running with backports on an affected system will fix quality issues on VGA outputs. Verified for oneiric on LP #614238.
---
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-
Regression: No
Reproducible: Yes
ProcVersionSign
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/
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,
Controls : 19
Simple ctrls : 9
Date: Fri Aug 6 07:47:00 2010
HibernationDevice: RESUME=
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=
ProcEnviron:
LANG=en_GB.utf8
SHELL=/bin/bash
RelatedPackageV
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.
dmi.board.
dmi.board.name: R530/R730
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: R530/R730
dmi.product.
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
Related branches
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
Changed in linux: | |
importance: | Unknown → High |
status: | Unknown → Confirmed |
description: | updated |
Changed in linux: | |
importance: | High → Unknown |
status: | Confirmed → Fix Released |
Changed in linux: | |
importance: | Unknown → High |
Changed in linux: | |
status: | Fix Released → Confirmed |
Changed in linux: | |
status: | Confirmed → Invalid |
Changed in linux: | |
status: | Invalid → Confirmed |
Changed in linux: | |
status: | Confirmed → Fix Released |
Changed in linux: | |
status: | Fix Released → Confirmed |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in linux (Ubuntu): | |
assignee: | Canonical Kernel Team (canonical-kernel-team) → Seth Forshee (sforshee) |
Changed in linux (Ubuntu Natty): | |
assignee: | Canonical Kernel Team (canonical-kernel-team) → Seth Forshee (sforshee) |
Changed in linux: | |
status: | Confirmed → Fix Released |
Changed in linux (Ubuntu Oneiric): | |
status: | Incomplete → In Progress |
description: | updated |
Changed in linux (Ubuntu Oneiric): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Natty): | |
status: | Incomplete → Invalid |
Here is a similar sounding bug# 600407 although this one refers to a desktop by the sound of it and the reporter indicates it might be a regression after 2.6.31-16.