Description of problem:
Video output produces sparkily vertical stripes when operating at 1280x1024
Version-Release number of selected component (if applicable):
Installation was done on a Dell Optiplex GX-150 using the onboard Intel video
sub system. The video was configured to be 1280x1024 at 75 Hz. The resulting
video output was stable but had sparkely vertical stripes that varied in
intensity depending on CPU utilization. The problem shows up at other
resolutions but to a lesser extent. This system was then reconfigured to run
WinXP at the same resolution and there was no sparkeling. I do not believe it
is a hardware problem.
Steps to Reproduce:
1. Install on a Dell Optiplex GX-250 with integrated Intel video graphics
Altering the video resolution and video refresh rate do not eliminate the
Thanks for the bug report. We have reviewed the information you have provided
above, and there is some additional information we require that will be helpful
in our diagnosis of this issue.
Please attach your X server config file (/etc/X11/xorg.conf) and X server log
file (/var/log/Xorg.*.log) to the bug report as individual uncompressed file
attachments using the bugzilla file attachment link below.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and
let X11 autodetect your display and video card? Attach to this bug
/var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 301727 [details]
original parameters in file Xorg.0.log
Created attachment 301728 [details]
original parameters in file xorg.conf
Created attachment 301729 [details]
new parameters after the xorg.conf was moved aside
Created attachment 301730 [details]
new parameters after the xorg.conf was moved aside
After the original xorg.conf was moved aside and then the system was rebooted,
I selected the 1280x1024 resolution and still have the same sparkly vertical
lines. I then changed the resolution to a lower value but the vertical lines
are still present. The vertical and horizontal sync are stable in all cases.
The amount of sparkle on the vertical lines is CPU load dependent. Since the
Intel video controller is cycle stealing its video memory from main memory, I
suspect that the arbitration initialization is not correct if using the onboard
Intel video controller.
you may want to try running this chipset in 16-bit, it doesn't work very well hw
wise in 24-bit.
I tried several resolutions and bits depths and found some amount of sparkling
at all of the 1280 x XXX and 1152 x XXX resolutions. Going down to 1024 x 768
finally cured the problem. I did not experience any of these problems running
Win XP on this computer previously. If Linux ever hopes to displace Windows on
the desktop, there will have to be a greater effort into fixing sloppy drivers
that give the end user a bad experiance. I realize this is a monumental task
in testing with all of the various flavors of PC platforms but telling an end
user to downgrade the resolution of the video display is not acceptable.
you sure XP was running in 24-bit colour? not 16-bit?
the chipset does no hw accel in 24-bit colour so I would think XP would be quite
unuseable in 24-bit on it.
So try 16-bit with higher res on Linux and see if it works.
Yes, I am quite sure that Win XP does operate in either 16 or 24 bit mode. The
Intel 82815 does support 8, 16 and 24 bit mode in 2D graphics mode according to
the Intel website. From the Intel website:
The Intel® 815 chipset family-based products support the following under Linux:
XFree86* 3.3.6 accelerated server
Support for up to 1600x1200 resolution.
2D Acceleration at 8,16 and 24 bit depths.
Full source code available.
FSB support at 133MHz.
Support for the Intel® Pentium® III processors.
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