Xorg display corruption, Dell Inspiron 6400, Lucid Beta ISO test

[Colin Ian King]

ISO testing, AMD64 test: ISO image http://cdimage.ubuntu.com/daily-live/20100316/lucid-desktop-amd64.iso

Test: http://iso.qa.ubuntu.com/qatracker/result/3764/6

Hardware: Dell Inspirion 6400, Video: ATI Technologies Inc M52 [Mobility Radeon X1300]

During installation while ubiquity is asking for configuration settings, the Xorg display is showing small amounts of random noise across the screen. This is approximately 16 pixels wide, 1 pixel high, very light in colour and only shows up against the darker parts of the background. It is a minor irritation.

However, this problem goes once Lucid is installed and one boots into the system.

I tried to report the bug using apport-bug against xorg, but this tool informs me that "This is not a genuine Ubuntu package".

[Colin Ian King (colin-king)]

Image of artefacts/corruption on screen

[Bryce Harrington (bryce)]

Hi Colin,

Thanks for including an image to demonstrate the issue. Could you also please attach the output of `lspci -vvnn` and `dmesg`, and attach your /var/log/Xorg.0.log or Xorg.0.log.old file from after reproducing this issue. If you've using a custom /etc/X11/xorg.conf please attach that as well.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[NUt&tuX (murtaz)]

Same here with a Dell Studio 15 laptop, with Ati Mobility 3400series.
Bug appear right after grub, when ubuntu loading logo shows up.

I've noticed that theses corruptions doesn't appear in alpha3.
Also, if nomodeset option is set at the begining (for the beta build), there is no problem.

Here is a video (bad quality, but we can see it) :
http://www.mediafire.com/?gtjfmtomgwi

Thanks.

[Bryce Harrington (bryce)]

[Resetting to incomplete since we need a response from the original reporter on this].

[NUt&tuX (murtaz)]

Here are the files needed.

[Bryce Harrington (bryce)]

@murtaz - thanks for providing that info, but we would like to see it from the original reporter. We may want to send this bug report upstream, but upstream has a hard and fast rule that logs from someone other than the original reporter are not acceptable. The reason for that is that quite often with X.org bug reports, two people may *think* they have the same issue based on commonality of symptoms and/or hardware, but in truth they have separate issues and mixing the report and the files can cause the developers some confusion.

If this bug report seems not to be getting attention, I would encourage you to file a new bug report with this data, and simply reference this bug report in your bug description.

[Colin Ian King (colin-king)]

Hi Bryce, I'm now not seeing the bug with the latest daily builds, so it's now a non-issue.

[Bryce Harrington (bryce)]

Thanks for letting us know the issue is resolved.

[Boris Gjenero (boris-gjenero)]

I'm getting a similar bug in 16.04 on my Inspiron 6400 with X1300 and a 1680x1050 display. I have disabled graphical overlays during boot because I prefer to see boot text. Corruption starts after the switch from ordinary VGA text mode to a high resolution text mode which I assume is implemented using a graphics mode. In that text mode, corruption is mostly flashing long vertical bright bars rising from the bottom. In X, corruption is mostly short horizontal lines on a dark area to the right of a bright area, and the long vertical bars seen in text mode rarely appear.

The corruption never propagates via screen operations like scrolling, so it doesn't seem to be in memory. It's as if there is something wrong with the video mode or LVDS communication with the display. I made the corruption go away in X by first switching to a lower resolution via "xrandr --output LVDS --mode 1400x1050" and then going back to the native resolution via "xrandr --output LVDS --mode 1680x1050". I'm not getting any corruption in Windows 7, so I don't think this is a hardware problem.