Comment 3 for bug 824099
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| Daniel Manrique (roadmr) wrote Re: [EeePC 1001 PXD] Plugging in external monitor to VGA port makes both displays corrupted with thick slanted lines | #3 |
I can confirm this bug as I have observed it on every system I've tested Oneiric Alpha 3 on, this includes about 30 laptops of different makes and models, with chipsets from Intel, NVidia and AMD. Here are my observations:
1- On Intel N10 systems, such as the Eee PC 1001 reported by Jeff, I get the exact same corrupted pattern he describes. Note that there are already bugs covering compiz-related problems with external displays on N10-based systems (bug 807161 and bug 790824) so in that particular case we might actually be looking at two problems.
2- On other Intel systems I get a different pattern: the external screen is entirely black, except for the top panel, and the built-in display shows a "dead zone" on the top fourth of the screen, while the bottom 3/4ths are alive and well. I'm attaching a screenshot of the internal display of an affected Intel machine.
3- On NVidia systems I get blocks of solid white or blue, with specks of other colors scattered about. I'll try to get and attach a picture of this.
4- Here's the interesting bit: it happens only when running Unity. If I select Ubuntu 2d upon login, external screen functionality works fine. On my Ubuntu 2d system I did ps wwuxa |grep compiz and compiz seems to be running, so it would indeed appear to be Unity3D-related.
I confirmed this on an Oneiric A3 installation, fully dist-upgraded as of today, August 11th.
Please let me know if I should attach logs, perform some more tests, or maybe split this into different bugs, though it seems clear to me that this happens everywhere with two screens.