visual corruption on startup (before desktop)

[Jason Warner]

I have a visual corruption that happens every time I boot up. the screen jumbles and has graphic glitches from previous desktops. This happens before I reach the desktop and displays for several seconds as the computer boots.

[Daniel van Vugt (vanvugt)]

Is this the same bug as the screenshots I just received in email?

[Jason Warner (jasoncwarner)]

I have two corruption issues at the moment. This one, on the desktop, and
another just after Unity Greeter, but before my desktop is displayed.

The second bug is captured here:
https://bugs.launchpad.net/compiz-core/+bug/932611

Nvidia graphics, btw.

On Wed, Feb 15, 2012 at 8:35 PM, Daniel van Vugt <email address hidden> wrote:

> Is this the same bug as the screenshots I just received in email?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/932611
>
> Title:
> visual corruption on startup (before desktop)
>
> Status in Compiz Core:
> New
>
> Bug description:
> I have a visual corruption that happens every time I boot up. the
> screen jumbles and has graphic glitches from previous desktops. This
> happens before I reach the desktop and displays for several seconds as
> the computer boots.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/compiz-core/+bug/932611/+subscriptions
>

[Daniel van Vugt (vanvugt)]

Isn't it the job of X or gnome-session-something to set the wallpaper on startup so you don't see corruption? It's possible the corruption is occurring and visible before compiz even starts.

Also, do you see the problem with Unity 2D?

[Daniel van Vugt (vanvugt)]

Please also try tapping Ctrl+Alt+F7 or Ctrl+Alt+F8 when on the login screen and after you have logged in, and verify that both are running on #7.

I have seen bugs in the past where lightdm and X11 were using different VTs, so of course the transition between the lightdm VT and the desktop VT was not smooth.

[Jason Warner (jasoncwarner)]

They are on the same VT, so that isn't it.

I am, however, getting the corruption with both Unity 2D and GNOME 3
sessions, so not as likely that it compiz it seems?

On Wed, Feb 15, 2012 at 9:23 PM, Daniel van Vugt <email address hidden> wrote:

> Please also try tapping Ctrl+Alt+F7 or Ctrl+Alt+F8 when on the login
> screen and after you have logged in, and verify that both are running on
> #7.
>
> I have seen bugs in the past where lightdm and X11 were using different
> VTs, so of course the transition between the lightdm VT and the desktop
> VT was not smooth.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/932611
>
> Title:
> visual corruption on startup (before desktop)
>
> Status in Compiz Core:
> Confirmed
> Status in Unity Distro Priority:
> Fix Committed
>
> Bug description:
> I have a visual corruption that happens every time I boot up. the
> screen jumbles and has graphic glitches from previous desktops. This
> happens before I reach the desktop and displays for several seconds as
> the computer boots.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/compiz-core/+bug/932611/+subscriptions
>

[Sam_ (and-sam)]

We've reported against unity-greeter since it happens after recent updates yesterday which incl. compiz and unity-greeter, update of xorg was longer ago. bug 932324

[Bryce Harrington (bryce)]

see lp bug #850885 which is a related and has Design team direction on workaround for the near term.

[Daniel van Vugt (vanvugt)]

<theory> I think Jason said he was using Nvidia (which is non-KMS). It wouldn't be surprising if the nvidia driver didn't clear the video memory used by the new mode or page. That's not necessarily a driver bug, but still possibly an application bug for assuming anything about the state of the framebuffer after a mode change. </theory>

[Sam_ (and-sam)]

No external monitors mentioned in bug reports (932324 ,933322), happens with nvidia or ati (radeon) with kms enabled.
Bug 933322 incl. some useful images of the issue, which I confirm (five frames with horizontol lines), although it looks worse here, maybe due to custom wallpaper.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 931967, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.