X shows noise on screen (SiS 661/741- pci id 1039:6330 rev 03)

Bug #592447 reported by Ricardo Aguiar on 2010-06-10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
xserver-xorg-video-sis (Ubuntu)

Bug Description

Binary package hint: xorg

I am trying to use at work a machine that have Sis 661/741/760 graphics adapter. When I set the resolution to 1280x720 (the size my wide screen monitor can handle) it appears noise on the screen. Using Windows(r) it does not happen (it works ok).
I tried to change the configurations (creating xorg.conf that is not generated at instalation anymore), but nothing helped. The VESA driver does not seem to allow this screen definition.

It seems to be a xorg driver problem (on "sis" driver).

I hope you can find the problem.

Thanks for you help.


ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic
Uname: Linux 2.6.32-22-generic i686
Architecture: i386
Date: Thu Jun 10 19:34:28 2010
DkmsStatus: Error: [Errno 2] Arquivo ou diretório não encontrado
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 002: ID 1241:1111 Belkin Mouse
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: PCCHIPS A33G
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=e5822177-b469-4811-b57b-7be232da2f01 ro quiet splash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 08/03/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080013
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: A33G
dmi.board.vendor: PCCHIPS
dmi.board.version: 1.0
dmi.chassis.asset.tag: 0123ABC
dmi.chassis.type: 3
dmi.chassis.vendor: PCCHIPS
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080013:bd08/03/2007:svnPCCHIPS:pnA33G:pvr1.0:rvnPCCHIPS:rnA33G:rvr1.0:cvnPCCHIPS:ct3:cvr1.0:
dmi.product.name: A33G
dmi.product.version: 1.0
dmi.sys.vendor: PCCHIPS
glxinfo: Error: [Errno 2] Arquivo ou diretório não encontrado
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-22-generic

Ricardo Aguiar (neldor) wrote :
Ricardo Aguiar (neldor) wrote :

After research I see the bug is a hardware problem.

At higher resolutions the graphics board overloads the memory BUS, causing the little dots and lines on the
screen. It happens because the processor has an embedded memory controller (Athlon X2), that is unaware
of the graphics board. So the graphics board can't read the RAM in time and it appears random dots and lines
on the screen.

So this combination of hardware (Athlon X2 and Sis 661/741/760 embedded) will not work properly with any
operational system at higher resolutions (but 800x600 and 1024x768 seems to work well).

The solution I took was put a new graphics board with it's own memory. With this new hardware configuration
the computer works well.

So it is not a software problem.

In my oppinion the hardware manufacturer should recal this hardware. :P


Bryce Harrington (bryce) on 2010-06-19
affects: xorg (Ubuntu) → xserver-xorg-video-sis (Ubuntu)
Bryce Harrington (bryce) on 2010-07-02
Changed in xserver-xorg-video-sis (Ubuntu):
status: New → Confirmed
Harshad (harshadtoke) wrote :

A simple workaround for this card is to lower the color depth to 16 as suggested in the xorg.0.log. This can be done by adding the following section to the /etc/X11/xorg.conf

Section "Screen"
  DefaultDepth 16
  Identifier "Default Screen"

Tested this with resolutions upto 1920x1080 it works fine, the reduced color depth is not noticeable on most LCD panels.

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