It is also true for my X200M radeon card with the radeon driver.
I started noticing it quite a long time ago, maybe even since the 10.04 version (while I have no issues with the i915 machine LTS) . For the time being I am running 11.04 on the custom-built kernel, uname: Linux 3.0.17-nonrad+ #1 SMP Wed Jan 18 12:24:31 CST 2012 i686 i686 i386 GNU/Linux
It is also true for my X200M radeon card with the radeon driver.
I started noticing it quite a long time ago, maybe even since the 10.04 version (while I have no issues with the i915 machine LTS) . For the time being I am running 11.04 on the custom-built kernel, uname: Linux 3.0.17-nonrad+ #1 SMP Wed Jan 18 12:24:31 CST 2012 i686 i686 i386 GNU/Linux