The hardware which you are reporting an issue with is not the same as that of the original poster:
Bug hardware: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
Your hardware: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
As well, please note that this bug concerns 10.04 whereas you are reporting an issue with 11.04. Please open a new bug from the affected hardware, using the following command:
Hello Fabián,
The hardware which you are reporting an issue with is not the same as that of the original poster:
Bug hardware: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
Your hardware: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
As well, please note that this bug concerns 10.04 whereas you are reporting an issue with 11.04. Please open a new bug from the affected hardware, using the following command:
$ ubuntu-bug xserver- xorg-video- intel
Thank you.