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I've had this bug since Ubuntu 12.04 and have battled with it for 8+
months.
Originally, switching from 11.10 to 12.04, I experienced bad screen
flickering (3-45 seconds between flickers) and could not find the issue.
I was also not able to run multiple monitors because when I plugged in
the HDMI cable, the resolution between screens would continually change
(every ~2 seconds) and would not settle on a configuration. I finally
was able to fix the issue by switching kernel versions to the 3.4 kernel
(back when I had 12.04). When I upgraded to 12.10 (upgrading the kernel
again to the default shipped with 12.10), I had the same issue and
reinstalled the 3.4 kernel and fixed the issue.
Now I'm back to the same issue after upgrading to 13.04. I have
screen/window flickering at random intervals and I cannot run an
external monitor (although, I can get about 10 minutes out of it before
it resets configurations for me). I can't reinstall the 3.4 kernel as
there is no version for ringtail.
Specs:
Description: Ubuntu 13.04
Release: 13.04
Memory: 5.7 GiB
Processor: Intel® Core™ i7-2640M CPU @ 2.80GHz × 4
Graphics: Intel® Sandybridge Mobile (with discrete AMD graphics) (open source
drivers xorg-edgers)
OS type: 64-bit
lspci dump for discrete graphics card:
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI
Whistler [Radeon HD 6600M/6700M/7600M Series] (rev ff)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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Resolution continually switches with dual monitors + screen flickering
https://bugs.launchpad.net/bugs/1173335
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