SRU Justification: Impact: Bad brightness handling on a wide range of laptops, plus boot crashes on a number of Samsung laptop.
Fix Description: direct backport of a group of ACPI changes which sort
out backlight handling plus prevent non-existant display devices being
detected as real.
Patch:
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=6620210fc1da8a39db88281290a0271d46e57283
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=ff8ad74bf82886a50cdc6b5ca0671dbe63e7f435
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=7279cb0e60d00b9fe0ca4292aacd6372f83c495e
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=2871e0ac9a33e81e9b4c68dd7e10c01ec452360f
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=971f09bdfb75a9923c61d99af3db1e006a8bc354
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=78da909520bf8169b7aa57729f5daade4daf76ef
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=56b51fa2eaf86599058dc905139d810fd847ea58
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=e525a3ca3b31b63144f177470dcf823bca381327
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=926f8037764bb44f52005f7ab7f946a62b005c91
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commit;h=4d7a929d3df4589ccb3c23f5ffb2774112c80a82
Risks: testing by a number of affected users has demonstrated successful
boot and improvements in brightness handling.
TEST CASE: see bug report.
--
brightness changes twice when using hotkeys
https://bugs.launchpad.net/bugs/257827
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