bug: 315922 title: 2.6.27-11 makes brightness not work [2.6.28-4.10 also affected] date-reported: Sat, 10 Jan 2009 21:44:08 -0000 date-updated: Mon, 25 Jun 2012 04:19:25 -0000 reporter: Nicolò Chieffo (yelo3) duplicate-of: duplicates: attachments: https://bugs.launchpad.net/bugs/315922/+attachment/437658/+files/lshal text/plain patches: tags: hardy jaunty needs-bisect needs-upstream-testing regression-release subscribers: Christian Busch (christianbusch) Dana Goyette (danagoyette) Corry Haines (tabletcorry) David Gibson (dwg) Charles (cistearns) Behnam Esfahbod "ZWNJ" (behnam) Natale Vinto (ebballon) Vaibhav (vaibhavmahimkar+vbuntu) penalvch (penalvch) task: linux (Ubuntu) status: Expired date-created: Mon, 12 Jan 2009 10:00:25 -0000 date-left-new: Mon, 12 Jan 2009 21:11:23 -0000 date-closed: Mon, 25 Jun 2012 04:19:24 -0000 date-left-closed: Sun, 18 Jan 2009 23:14:38 -0000 reporter: Nicolò Chieffo (yelo3) importance: Undecided component: main assignee: milestone: Content-Type: multipart/mixed; boundary="===============8914670206806935595==" MIME-Version: 1.0 --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Binary package hint: linux-image-2.6.27-11-generic After an upgrade from linux-image-2.6.27-10 to 2.6.27-11 brightness control= s do not work anymore (keys and applet). I've just done a clean install of ubuntu 8.10 and immediately updated it. R= olling back to previous version fixes the problem. Hp dv6627 laptop, lshal attached --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Sat, 10 Jan 2009 21:44:08 -0000 Message-Id: <20090110214409.15787.66283.malone@potassium.ubuntu.com> --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Scott G (scotta-g1967) Date: Sat, 10 Jan 2009 22:21:54 -0000 Message-Id: <20090110222155.24490.10952.malone@palladium.canonical.com> I have noticed the same problem, though mine happened after a kernel update from the proposed branch 2.6.27-11-generic, When I boot in too 2.6.27-9 all is fine, though 2.6.27-11 kills the brightness control. Other power management seems OK though I have not really tested this yet, but CPU scaling is certainly ok My machine is an Acer Aspire 5920G --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Sun, 11 Jan 2009 18:12:56 -0000 Message-Id: <641322f90901111012r6baacb71jc979aeb88ab662a2@mail.gmail.com> I have to say that a downgrade of g-p-m was only enough to re-enable the brightness panel applet. But when moving the cursor up and down the brightness does not change. Maybe I should try to boot into linux 2.6.27-9 like you Scott! --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Mon, 12 Jan 2009 10:00:00 -0000 Message-Id: <20090112100000.15787.55405.malone@potassium.ubuntu.com> The problem is in the kernel 2.6.27-10 works correctly even in new gnome-power-manager, you were definitely right --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Christian Busch (christianbusch) Date: Mon, 12 Jan 2009 21:09:43 -0000 Message-Id: <20090112210944.1153.94278.malone@gangotri.canonical.com> Same thing here on a HP Paviliion 6870eg. Wenn I unplug the power cord, brightness decreases. When I plug the cord in= , the brightness increases. I can't neither controll the brightness with the fn keys nor the brightness= applet. Also the OSD doesn't show up. The other fn keys work just fine. Workaround now is booting another kernel. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Wed, 14 Jan 2009 22:26:33 -0000 Message-Id: <641322f90901141426j7fc1542doc97efff69f64dca3@mail.gmail.com> Not working also in jaunty, 2.6.28-4-generic --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: sasha (sasha123-deactivatedaccount) Date: Fri, 16 Jan 2009 10:43:00 -0000 Message-Id: <20090116104300.19956.2130.malone@palladium.canonical.com> i have upgraded the 2.6.27-11-generic today and now the screen brightness control works fine. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Fri, 16 Jan 2009 11:01:01 -0000 Message-Id: <641322f90901160301y7764927dg436d1227ef220786@mail.gmail.com> I don't have intrepid anymore, but foru sure jaunty does not work. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Christian Busch (christianbusch) Date: Fri, 16 Jan 2009 22:27:14 -0000 Message-Id: <20090116222715.20364.98992.malone@potassium.ubuntu.com> I also upgraded 2.6.27-11-generic now. It works without flaws. Bug solved? --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Sat, 17 Jan 2009 09:28:17 -0000 Message-Id: <641322f90901170128w5344f43fl4da3f6138ab7c8f7@mail.gmail.com> Not for jaunty --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Dana Goyette (danagoyette) Date: Sat, 17 Jan 2009 17:59:24 -0000 Message-Id: <20090117175924.24060.31229.malone@palladium.canonical.com> I'm on Jaunty, and the latest 2.6.28-4.10 generic x86-64 kernel entirely removes my ability to change brightness levels; the previous kernel works perfectly. Under the old kernel, /proc/acpi/video/DGFX/LCD/brightness returns this: levels: 100 51 30 37 44 51 58 65 72 79 86 93 100 current: 100 Under the new kernel, it returns this: Under the old kernel, HAL uses /sys/class/backlight/acpi_video0 to control brightness; under the new kernel, the /sys/class/backlight directory is completely empty. I believe the fix for the "reversed brightness" bug ( https://bugs.launchpad.net/ubuntu/+source/linux/+bug/311716 ) is most likely what broke my brightness control. Also note this comment in that bug description: "Risks: as we are supressing ACPI brightness support we may suppress it where it is required" Laptop is a customized-to-order HP EliteBook 8530w. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Dana Goyette (danagoyette) Date: Sun, 18 Jan 2009 00:53:49 -0000 Message-Id: <20090118005349.16244.48139.malone@gandwana.canonical.com> Okay, I just tested, and the same version (but 32-bit) kernel on my old Gateway M685 also breaks backlight control. Same symptoms: proc has and sys is empty. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Dana Goyette (danagoyette) Date: Sun, 18 Jan 2009 08:54:29 -0000 Message-Id: <20090118085430.15703.71505.malone@gangotri.canonical.com> Another system affected: an old Toshiba Satellite 1415 laptop. ACPI Video module normally gives levels labeled as 0%, 40%, and 100%, but now gives nothing. For better backlight control, this laptop needs toshiba- acpi instead of tlsup, but that's an entirely different issue. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: =?utf-8?q?Nicol=C3=B2_Chieffo_=28yelo3=29?= Date: Sun, 18 Jan 2009 23:14:36 -0000 Message-Id: <20090118231437.4364.63691.malone@potassium.ubuntu.com> The fix is only for Intrepid, Jaunty still needs it --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Dana Goyette (danagoyette) Date: Mon, 19 Jan 2009 05:03:09 -0000 Message-Id: <20090119050310.4320.84687.malone@potassium.ubuntu.com> Aah, I see it now in the Intrepid changelogs. Cool, so now I can just wait, and it'll be fixed with an upcoming Jaunty kernel, right? (By the way, the "tlsup" bug is also fixed in intrepid-proposed but not in jaunty: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/261318 ) linux (2.6.27-11.24) intrepid-proposed; urgency=3Dlow [ Stefan Bader ] * Revert "SAUCE: don't use buggy _BCL/_BCM/_BQC for backlight control" - LP: #311716 * SAUCE: acpi: Hack to enable video and vendor backlight implementations - LP: #311716 * SAUCE: Force vendor backlight control on ThinkPad T61 - LP: #311716 [ Upstream Kernel Changes ] * Revert "thinkpad_acpi: fingers off backlight if video.ko is serving this functionality" - LP: #311716 -- Stefan Bader Thu, 08 Jan 2009 15:08:52 +0100 --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: David Gibson (dwg) Date: Mon, 02 Feb 2009 07:58:07 -0000 Message-Id: <20090202075808.15791.48441.malone@gangotri.canonical.com> I still see the problem on Intrepid with2.6.27-11.27 on a Thinkpad X61. Neither Fn-keys nor the sliders in System|Preferences|Power Management alter the screen brightness. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Charles (cistearns) Date: Wed, 04 Feb 2009 00:35:26 -0000 Message-Id: <20090204003526.27365.27607.malone@potassium.ubuntu.com> I will echo that, on the Thinkpad X61s I have the same problem 2.6.27-11-generic, the brightness control doesn't work. Booting back in 2.6.27-7-generic works fine. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Chris Jones (cmsj) Date: Sun, 15 Feb 2009 19:30:20 -0000 Message-Id: <20090215193020.26413.56640.malone@gangotri.canonical.com> should this be marked as a duplicate of bug #311716 ? --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Dana Goyette (danagoyette) Date: Sun, 15 Feb 2009 20:36:03 -0000 Message-Id: <20090215203604.25941.75281.malone@gandwana.canonical.com> For me on Jaunty, the 2.6.28-7-generic kernel has been fixed now -- it seems they've reverted the "don't use _BCM and _BCL" patches. I'm not sure about the Intrepid kernel, though. Also, this is not quite a duplicate -- it's more of a "fixing that one broke this one" issue. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Behnam Esfahbod "ZWNJ" (behnam) Date: Tue, 10 Mar 2009 07:05:14 -0000 Message-Id: <20090310070514.31161.18166.malone@palladium.canonical.com> As it's a kernel problem, not gnome-power-manater, this is a duplicate of bug 313231 which has a couple other dups as well. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Natale Vinto (ebballon) Date: Sun, 15 Mar 2009 13:16:53 -0000 Message-Id: <20090315131653.27765.86035.malone@palladium.canonical.com> Hi, on my ubuntu jaunty is working with the 2.6.28-8 but not with the last 2.6.28.7 from kernel.org, how to fix it in that kernel? --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: penalvch (penalvch) Date: Wed, 25 Apr 2012 11:16:15 -0000 Message-Id: <20120425111616.23116.59368.malone@wampee.canonical.com> Nicol=C3=B2 Chieffo, thank you for reporting this and helping make Ubuntu b= etter. Hardy desktop reached EOL on May 12, 2011. Please see this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases We were wondering if this is still an issue in a supported release? If so, can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ . If it remains an issue, could you run the following command in a supported release from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report. apport-collect -p linux Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream- testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'. Please let us know your results. Thanks in advance. --===============8914670206806935595== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Author: Launchpad Janitor (janitor) Date: Mon, 25 Jun 2012 04:19:24 -0000 Message-Id: <20120625041924.20986.18542.malone@loganberry.canonical.com> [Expired for linux (Ubuntu) because there has been no activity for 60 days.] --===============8914670206806935595==--