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I run Fedora (currently version 16, but this problem has been around a while) and occasionally when I switch virtual terminals (VTs) the new VT shows a corrupted version of some data that was previously displayed on the old VT. For example, if I was watching a youtube video in VT1 and press CTRL-ALT-F2 to switch to VT2, where I am logged in to a second X session, the X session doesn't show a login on a blank screen; it shows a login on a screen that appears to have a tiled corrupted version of the youtube video as wallpaper. Or maybe just gibberish.
Here is a sample. It's not clear in the photo because my phone's camera washes out the dialog box, but the unlock dialog box is properly drawn and everything works perfectly fine after unlocking the workstation.
I would like to find some way to prevent this from happening, as it's quite ugly and not to mention a security or privacy risk when two different users are sharing the same workstation and some random image isn't even on the screen anymore appears in the other session's lock screen.
In case it matters, I have a adeon HD 5800 Series video card and I'm using the stock Free AMD drivers that ship with Fedora.
How can I prevent this issue from happening, or at least force the screen to refresh on the lock screen so that this corruption doesn't stay on the screen?
I've tried playing with various screensavers and lock screen options and nothing seems to be able to prevent the corruption.
2I think you'd have to find a way to clear the framebuffer? But I don't know how to do this. – chrishiestand – 2012-06-13T20:48:56.773
Switching between text consoles in a Linux virtual machine When the CTRL + ALT + F1 key combination is used to switch to another text console (terminal) on a Linux virtual machine, the host switches to a text console instead of the guest. Resolution The CTRL + ALT combination is used by VMware to direct the keyboard input to the host. Press CTRL + ALT + Space , press the F1 key (or desired Function key) while still holding down CTRL + ALT – Khusen Asoy – 2012-06-16T17:21:05.857
@KhusenAsoy There is no virtualization, such as Xen or VMWare on my setup. – Mr. Shiny and New 安宇 – 2012-06-17T16:28:10.703
I think you should file a bug report.
– Cristian Ciupitu – 2012-06-19T00:00:20.390