From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-15?Q?Niccol=F2_Belli?= Subject: How to disable (not working) native backlight support? Date: Mon, 29 Aug 2011 03:10:00 +0200 Message-ID: <4E5AE6E8.3060404@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-fx0-f49.google.com (mail-fx0-f49.google.com [209.85.161.49]) by gabe.freedesktop.org (Postfix) with ESMTP id E19139E75E for ; Sun, 28 Aug 2011 18:09:35 -0700 (PDT) Received: by fxd20 with SMTP id 20so5051106fxd.36 for ; Sun, 28 Aug 2011 18:09:34 -0700 (PDT) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org I have a Samsung X360 laptop and I always used the samsung-backlight patches. (Un?)fortunately since 2.6.39 they merged native backlight support, it would have been a wonderful news if it would have worked flawlessly. Unfortunately sometimes it does not work, the screen flickers and /var/log/messages if full of tons of Aug 18 18:39:47 laptop logger: ACPI event unhandled: video/brightnessdown BRTDN 00000087 00000000 If I apply samsung-backlight on top of >=2.6.39 I get: Aug 18 18:35:00 laptop kernel: [ 117.717567] samsung_backlight: found laptop model 'X360' Aug 18 18:35:00 laptop kernel: [ 117.717591] ------------[ cut here ]------------ Aug 18 18:35:00 laptop kernel: [ 117.717599] WARNING: at drivers/video/backlight/backlight.c:314 backlight_device_register+0xfb/0x16e() Aug 18 18:35:00 laptop kernel: [ 117.717603] Hardware name: X360 Aug 18 18:35:00 laptop kernel: [ 117.717606] samsung: invalid backlight type Aug 18 18:35:00 laptop kernel: [ 117.717608] Modules linked in: samsung_backlight(+) snd_hda_codec_realtek iwlagn(+) mac80211 sg snd_hda_intel(+) snd_hda_codec snd_hwdep tpm_tis tpm samsung_laptop snd_pcm tpm_bios snd_timer psmouse iTCO_wdt cfg80211 snd iTCO_vendor_support serio_raw soundcore pcspkr rfkill snd_page_alloc sky2 battery thermal fan evdev container ac processor power_supply Aug 18 18:35:00 laptop kernel: [ 117.717645] Pid: 401, comm: modprobe Not tainted 3.0.0-gentoo #1 Aug 18 18:35:00 laptop kernel: [ 117.717648] Call Trace: Aug 18 18:35:00 laptop kernel: [ 117.717655] [] ? warn_slowpath_common+0x78/0x8c Aug 18 18:35:00 laptop kernel: [ 117.717661] [] ? warn_slowpath_fmt+0x45/0x4a Aug 18 18:35:00 laptop kernel: [ 117.717667] [] ? device_private_init+0x3a/0x40 Aug 18 18:35:00 laptop kernel: [ 117.717673] [] ? backlight_device_register+0xfb/0x16e Aug 18 18:35:00 laptop kernel: [ 117.717679] [] ? dmi_check_cb+0x1a/0x1a [samsung_backlight] Aug 18 18:35:00 laptop kernel: [ 117.717686] [] ? samsung_init+0xce/0xfe6 [samsung_backlight] Aug 18 18:35:00 laptop kernel: [ 117.717692] [] ? dmi_check_cb+0x1a/0x1a [samsung_backlight] Aug 18 18:35:00 laptop kernel: [ 117.717697] [] ? do_one_initcall+0x78/0x131 Aug 18 18:35:00 laptop kernel: [ 117.717703] [] ? sys_init_module+0xb7/0x207 Aug 18 18:35:00 laptop kernel: [ 117.717710] [] ? system_call_fastpath+0x16/0x1b Aug 18 18:35:00 laptop kernel: [ 117.717713] ---[ end trace c6966c0be6e01b72 ]--- Aug 18 18:35:00 laptop kernel: [ 117.717725] ------------[ cut here ]------------ Aug 18 18:35:00 laptop kernel: [ 117.717732] WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0x8c/0x9e() Aug 18 18:35:00 laptop kernel: [ 117.717735] Hardware name: X360 Aug 18 18:35:00 laptop kernel: [ 117.717737] sysfs: cannot create duplicate filename '/class/backlight/samsung' Aug 18 18:35:00 laptop kernel: [ 117.717740] Modules linked in: samsung_backlight(+) snd_hda_codec_realtek iwlagn(+) mac80211 sg snd_hda_intel(+) snd_hda_codec snd_hwdep tpm_tis tpm samsung_laptop snd_pcm tpm_bios snd_timer psmouse iTCO_wdt cfg80211 snd iTCO_vendor_support serio_raw soundcore pcspkr rfkill snd_page_alloc sky2 battery thermal fan evdev container ac processor power_supply Aug 18 18:35:00 laptop kernel: [ 117.717772] Pid: 401, comm: modprobe Tainted: G W 3.0.0-gentoo #1 Aug 18 18:35:00 laptop kernel: [ 117.717774] Call Trace: Aug 18 18:35:00 laptop kernel: [ 117.717779] [] ? warn_slowpath_common+0x78/0x8c Aug 18 18:35:00 laptop kernel: [ 117.717784] [] ? warn_slowpath_fmt+0x45/0x4a Aug 18 18:35:00 laptop kernel: [ 117.717789] [] ? sysfs_add_one+0x8c/0x9e Aug 18 18:35:00 laptop kernel: [ 117.717793] [] ? sysfs_do_create_link+0x100/0x1a7 Aug 18 18:35:00 laptop kernel: [ 117.717799] [] ? device_add+0x216/0x5d0 Aug 18 18:35:00 laptop kernel: [ 117.717805] [] ? complete_all+0x32/0x41 Aug 18 18:35:00 laptop kernel: [ 117.717810] [] ? backlight_device_register+0x10c/0x16e Aug 18 18:35:00 laptop kernel: [ 117.717816] [] ? dmi_check_cb+0x1a/0x1a [samsung_backlight] Aug 18 18:35:00 laptop kernel: [ 117.717822] [] ? samsung_init+0xce/0xfe6 [samsung_backlight] Aug 18 18:35:00 laptop kernel: [ 117.717829] [] ? dmi_check_cb+0x1a/0x1a [samsung_backlight] Aug 18 18:35:00 laptop kernel: [ 117.717833] [] ? do_one_initcall+0x78/0x131 Aug 18 18:35:00 laptop kernel: [ 117.717838] [] ? sys_init_module+0xb7/0x207 Aug 18 18:35:00 laptop kernel: [ 117.717843] [] ? system_call_fastpath+0x16/0x1b Aug 18 18:35:00 laptop kernel: [ 117.717846] ---[ end trace c6966c0be6e01b73 ]--- How can I disable native backlight support so that I can apply samsung-backlight flawlessly? Thank you, Darkbasic