I have a Toshiba L875, AMD, with Radeon graphics card. Win8 was pre-installed. There are two problems but I believe one underlying cause.
Problem: the first is that the display has random gray artifacts. Grey boxes or what look like grey shards of broken glass, randomly appear on screen. Triggering a refresh (resize or move a window) usually removes the artifacts, though they reappear.
How I've tried to fix it:
- Have verified that open source Radeon drivers are in use (Settings > Software & Updates > Additional drivers)
- Have added proprietary ATI drivers (same as above)
- Have added ATI catalyst center
- Added latest kernel, 3.10
- Installed various distros: Mint, Ubuntu 13.04, 12.04 LTS, Lubuntu, all Ubuntu derivatives
compiz. That was a mistake :)
Each of these attempts are separate, not cumulative.
Adding/changing drivers either had no effect on the problem or, in the case of the proprietary drivers, I had to reinstall Ubuntu, as a reboot ended with a black screen and blinking white cursor that accepted no commands.
I attempted to remove/change
compiz because most Ubuntu reported errors listed
/usr/bin/compiz as the location.
Problem 2: Oh, and my ultimate goal is to get dual monitors working. Any attempts to plug-in a VGA monitor blank the laptop monitor or freeze it.
Currently: my attempts are more whack-a-mole than systematic and probably incorrect in some way, but I am not sure what else to do: it seems a video problem.
A fresh install awaits at home, so the default video drivers and kernel are no longer in-play.
However, I believe what fixes one problem will fix the other.
I've learned a lot over the 25 or so hours spent researching and trying to resolve the video problem, but I need it to work now. Before I jumped, I used a VM for about a month and set-up a Bitnami WordPress stack as a very good OneNote replacement. So, I checked workflow. And, I could be wrong, but was sure dual monitors worked when I ran the LiveDVD to test for hardware support. Anyway, like the Ham & Egg breakfast story that explains the difference between involved and committed (the chicken is involved, the pig committed), I removed Win 8 and went all-in. So, I am committed.
Thanks for any support, I appreciate the time of those in the forum.