From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean-Denis Girard Subject: Backlight not working after resume Date: Sun, 01 Nov 2009 11:05:30 -1000 Message-ID: <4AEDF81A.8070508@sysnux.pf> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtps0.mana.pf ([202.3.225.97]:34550 "EHLO smtps0.mana.pf" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753447AbZKAVMb (ORCPT ); Sun, 1 Nov 2009 16:12:31 -0500 Received: from smtps0.mana.pf (localhost [127.0.0.1]) by smtps0.mana.pf (Postfix) with ESMTP id 70232C7617 for ; Sun, 1 Nov 2009 11:05:31 -1000 (TAHT) Received: from tiare.sysnux.pf (196.244.3.202.dial.dyn.mana.pf [202.3.244.196]) by smtps0.mana.pf (Postfix) with ESMTP id 38735C62EA for ; Sun, 1 Nov 2009 11:05:31 -1000 (TAHT) Received: from tiare.sysnux.pf (tiare.sysnux.pf [127.0.0.1]) by tiare.sysnux.pf (Postfix) with ESMTP id 29DE12EF90 for ; Sun, 1 Nov 2009 11:05:31 -1000 (TAHT) Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi list, I have a Samsung q30 ultra-portable; ACPI video seems supported by standard driver. After boot, backlight control works fine with the dedicated laptop keys, but it no longer works after suspend / resume. The laptop itself is still working: I can ssh, even X is working. I can add an external screen and everything is OK, it's just the panel backlight is off. I have tried several methods found on the Internet (setpci, xrandr, sysfs) without luck. I can do: echo x >/sys/class/backlight/acpi_video0/brightness (x=3D0..7) to adjust brightness after boot. After resume, the command works, but has no effect. Video is: ~ Intel Corporation 82852/855GM Integrated Graphics Device I'm using KMS since 2.6.31-rc something (it was not working before). Before KMS, I used vbetool post to get my screen back on. I filed a bug at freedesktop.org one month ago, there's more detail there (acpidump, ...): http://bugs.freedesktop.org/show_bug.cgi?id=3D24201 Problem persists with kernel version is 2.6.32-rc5. I can provide more info, and I'm willing to try corrections / patches t= o solve this problem. Thanks, - -- Jean-Denis Girard SysNux Syst=C3=A8mes Linux en Polyn=C3=A9sie fran=C3= =A7aise http://www.sysnux.pf/ T=C3=A9l: +689 50 10 40 / GSM: +689 79 75 27 -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAkrt+BoACgkQuu7Rv+oOo/hkdwCdEUD7/TE8ZLpvbrStTchliNus Z2cAnRsDVUGZFKlqA2klZQDYOsb3NB2n =3DfaAb -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html