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Description of problem: Video output produces sparkily vertical stripes when operating at 1280x1024 75Hz resolution. Version-Release number of selected component (if applicable): How reproducible: 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 2. 3. Actual results: Sparkely video Expected results: Additional info: Altering the video resolution and video refresh rate do not eliminate the problem.
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. Hardware cursor. Full source code available. FSB support at 133MHz. Support for the Intel® Pentium® III processors.
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