From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 75917] backlight switches off when starting X - since kernel-3.13 Date: Sat, 14 Jun 2014 12:47:21 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1767805399==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id E65536E12D for ; Sat, 14 Jun 2014 05:47:20 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1767805399== Content-Type: multipart/alternative; boundary="1402750040.DF0Fcae31.4422"; charset="us-ascii" --1402750040.DF0Fcae31.4422 Date: Sat, 14 Jun 2014 12:47:20 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=75917 --- Comment #12 from sfievet --- I am affected by this bug too. I have a Acer 3820TG laptop featuring Intel IGP (Ironlake) / AMD DGP (Radeon 6550M). It kept me stucked with kernel 3.12 series until I googled for "backlight issue" rather than "Intel driver issue" and found THIS bug report. :-) adding radeon.runpm=0 to the boot options works for me too. I haven't tested the patch yet. FWIW, I'd like to add 2 side informations hoping it might be related : - the backlight control only works for the Intel IGP. If the laptop goes idle when on the radeon, waking it up doesn't bring the backlight back. - when switching from Ironlake to Radeon through VGA switcheroo, I have to use "ON -> MIGD -> DDIS" sequence as the screen goes black immediately after passing "ON". -- You are receiving this mail because: You are the assignee for the bug. --1402750040.DF0Fcae31.4422 Date: Sat, 14 Jun 2014 12:47:20 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 12 on bug 75917 from 
I am affected by this bug too.
I have a Acer 3820TG laptop featuring Intel IGP (Ironlake) / AMD DGP (Radeon
6550M). It kept me stucked with kernel 3.12 series until I googled for
"backlight issue" rather than "Intel driver issue" and found THIS bug report.
:-)

adding radeon.runpm=0 to the boot options works for me too. I haven't tested
the patch yet.

FWIW, I'd like to add 2 side informations hoping it might be related :
- the backlight control only works for the Intel IGP. If the laptop goes idle
when on the radeon, waking it up doesn't bring the backlight back.
- when switching from Ironlake to Radeon through VGA switcheroo, I have to use
"ON -> MIGD -> DDIS" sequence as the screen goes black immediately after
passing "ON".

You are receiving this mail because:
  • You are the assignee for the bug.
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