this bug is fixed by the mainline kernel
"linux-image-3.4.0-030400rc3-generic_3.4.0-030400rc3.201204152235_amd64.deb"
this bug is fixed by the mainline kernel
"linux- image-3. 4.0-030400rc3- generic_ 3.4.0-030400rc3 .201204152235_ amd64.deb"