Vertical green lines bands in 24-bit on Compaq Deskpro (i815)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
xserver-xorg-video-i810 (Ubuntu) |
Invalid
|
Medium
|
Ubuntu-X |
Bug Description
Hello,
As I know, the problem is not new.
I have installed Ubuntu "Breezy Badger" on the following configuration:
COMPAQ Deskpro EN
Intel Pentium III 800Mhz
384Mb RAM
Intel Corporation 82815 CGC [Chipset Graphics Controller]
Philips 190S Monitor
The instalation went without problems, and all the hardware was recognized correctly. Unfortunately, my screen looked like this:
http://
http://
The problem does not depend on the monitor. (I have tryed another one)
The problem exists only with resolution above 1024x768. On 1024x768 the problem disapeares. In the same time though, as far as I can see, the monitor is still flickering.
The problem is solved "in a half" when adding this ModeLine:
# V-freq: 60.00 Hz // h-freq: 63.73 KHz
Modeline "1280x1024" 109.62 1280 1336 1472 1720 1024 1024 1026 1062
Generated with this ModeLine generator:
http://
(Only this one realy works!)
You can see the result here:
http://
http://
The lines are still there, but not so obvious.
Finaly, the only real solution is to change the Default color depth to 16. This fixes the problem, but now the colors are not as good as they can be.
I have found this forum topic, that explained me about the color depth:
http://
I guess that this Intel chipset is realy quirky piece of hardware.
This is the output of the "ddcprobe" command:
vbe: VESA 3.0 detected.
oem: Intel(R) 815 Chipset Video BIOS
vendor: Intel Corporation
product: Intel(R) 815 Chipset Hardware Version 0.0
memory: 1024kb
mode: 132x25 (text)
mode: 132x43 (text)
mode: 132x50 (text)
mode: 132x60 (text)
mode: 320x200x64k
mode: 640x400x256
mode: 640x480x256
mode: 640x480x32k
mode: 640x480x64k
mode: 640x480x16m
mode: 800x600x16
mode: 800x600x256
mode: 800x600x32k
mode: 800x600x64k
mode: 800x600x16m
mode: 1024x768x256
edid: 1 3
id: 082f
eisa: PHL082f
serial: 0003480f
manufacture: 34 2005
input: separate sync, composite sync, sync on green, digital signal.
screensize: 38 30
gamma: 2.200000
dpms: RGB, active off, suspend, standby
timing: 720x400@70 Hz (VGA 640x400, IBM)
timing: 720x400@88 Hz (XGA2)
timing: 640x480@60 Hz (VGA)
timing: 640x480@67 Hz (Mac II, Apple)
timing: 640x480@72 Hz (VESA)
timing: 640x480@75 Hz (VESA)
timing: 800x600@60 Hz (VESA)
timing: 800x600@72 Hz (VESA)
timing: 800x600@75 Hz (VESA)
timing: 832x624@75 Hz (Mac II)
timing: 1024x768@87 Hz Interlaced (8514A)
timing: 1024x768@70 Hz (VESA)
timing: 1024x768@75 Hz (VESA)
timing: 1280x1024@75 (VESA)
ctiming: 1280x1024@60
dtiming: 1280x1024@70
monitorserial: BZ 215055
monitorname: Philips 190S
monitorrange: 30-83, 56-76
And my xorg.conf:
# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "Files"
FontPath "/usr/share/
FontPath "/usr/share/
FontPath "/usr/share/
FontPath "/usr/share/
FontPath "/usr/share/
FontPath "/usr/share/
FontPath "/usr/share/
FontPath "/usr/share/
# paths to defoma fonts
FontPath "/var/lib/
FontPath "/var/lib/
EndSection
Section "Module"
Load "GLcore"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "type1"
Load "vbe"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us,bg"
Option "XkbVariant" "bds"
Option "XkbOptions" "grp:alt_
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection
Section "Device"
Identifier "Intel Corporation 82815 CGC [Chipset Graphics Controller]"
Driver "i810"
BusID "PCI:0:2:0"
EndSection
Section "Monitor"
Identifier "Philips 190S"
Option "DPMS"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation 82815 CGC [Chipset Graphics Controller]"
Monitor "Philips 190S"
SubSection "Display"
SubSection "Display"
SubSection "Display"
SubSection "Display"
SubSection "Display"
SubSection "Display"
EndSection
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection
Section "DRI"
Mode 0666
EndSection
Changed in xserver-xorg-driver-i810: | |
status: | Unconfirmed → Confirmed |
Changed in xserver-xorg-video-i810: | |
assignee: | nobody → ubuntu-x-swat |
Looking at the forum post, it appears to be using:
*Mode "1280x1024": 108.0 MHz, 64.0 kHz, 60.0 Hz
Modeline "1280x1024" 108.00 1280 1328 1500 1688 1024
1025 1028 1066
which matches the suggested "Future mode" that the monitor is providing.
I notice also that DRI (direct rendering for 3D) only works in 16-bit. Does setting the depth to '32' also make it work?
I think the vertical lines might be resolvable by adjusting the horizontal-scale and phase (these should be menu options on the monitor).
Does it still occur with a CRT (a none flat-panel); as the lines maybe the result of going Digital- >Analogue- >Digital and having the match analogue pixels back up to a square grid of pixels.
Those vertical lines are occuring every 100 pixels, so it maybe the case of fitting 99 pixels in 100 pixels width - every 100'th you need to miss one out.
Try reducing the width (scaling) slightly.