Red Hat Bugzilla – Bug 710293
[Calistoga] i915 can't handle dual screen GNOME 3
Last modified: 2011-06-06 11:08:34 EDT
Description of problem:
I have a Compaq tc4400 using i915 in the kernel for the graphics controller:
Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller
When I run GNOME 3 normally, it is accelerated, and works at 1024x768. It is pleasant and nice and responsive.
If I plug in my second monitor, the screen successfully paints across the length. However, everything is incredibly unresponsive and slow, and there is a lot of diagonal tearing when windows move or open or close. It isn't useable.
In xorg.0.log, when changing to two monitors, I note this:
[126005.494] (WW) intel(0): Failed to set tiling on frontbuffer.
[126005.494] (II) intel(0): Allocated new frame buffer 2944x1293 stride 11776, untiled
When I switch back to just my laptop's LCD, I see this:
[126232.348] (II) intel(0): Allocated new frame buffer 1024x768 stride 4096, tiled
I was able to use my second monitor with Fedora 14 (using GNOME Panel and Metacity or Compiz) fine. (I think Compiz worked fine. I'm actually kind of fuzzy on that memory.)
Version-Release number of selected component (if applicable):
Always, whenever I plug in the second monitor.
Steps to Reproduce:
1. upgrade to Fedora 15 and use GNOME Shell
2. plug in a second monitor
Responsiveness slows to a crawl, though at least everything is drawn eventually. There is tearing on windows.
Responsiveness remains constant and good.
I wonder whether my video card won't be able to handle GNOME 3 with a second monitor. :|
Created attachment 502667 [details]
*** This bug has been marked as a duplicate of bug 699705 ***