Comment 117 for bug 333386

@Pablo,

sorry to hear that and strange. Because the patch should be included in -15.52
as far as I can see. Do you get a message when doing "dmesg |grep 'less
restr'"? If not, you might try to boot with acpi_video_strict_detect=0 and see
whether that helps.

Maybe you had a version installed, that did not do a check for a certain system
(I already wondered why the latest one worked for you as you had a slightly
different laptop, iirc).

Going back to that kernel version should work with "dpkg -i" but on the other
hand would keep you from getting any updates that came along with the newer
version.

Please let me know whether the boot option above helps.