From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Deucher Subject: Re: [PATCH 3/3] i915: Don't provide ACPI backlight interface if firmware expects Windows 8 Date: Mon, 10 Jun 2013 10:09:18 -0400 Message-ID: References: <1370818899-8595-1-git-send-email-matthew.garrett@nebula.com> <1370818899-8595-4-git-send-email-matthew.garrett@nebula.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary=089e01293fe293264d04decd53e4 Return-path: Received: from mail-vb0-f49.google.com ([209.85.212.49]:43197 "EHLO mail-vb0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750792Ab3FJOJT (ORCPT ); Mon, 10 Jun 2013 10:09:19 -0400 In-Reply-To: <1370818899-8595-4-git-send-email-matthew.garrett@nebula.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Matthew Garrett Cc: linux-acpi@vger.kernel.org, daniel.vetter@ffwll.ch, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, rjw@sisk.pl, seth.forshee@canonical.com, joeyli.kernel@gmail.com, lenb@kernel.org --089e01293fe293264d04decd53e4 Content-Type: text/plain; charset=ISO-8859-1 Radeon probably needs something similar. See attached untested patch. Alex On Sun, Jun 9, 2013 at 7:01 PM, Matthew Garrett wrote: > Windows 8 leaves backlight control up to individual graphics drivers rather > than making ACPI calls itself. There's plenty of evidence to suggest that > the Intel driver for Windows doesn't use the ACPI interface, including the > fact that it's broken on a bunch of machines when the OS claims to support > Windows 8. The simplest thing to do appears to be to disable the ACPI > backlight interface on these systems. > > Signed-off-by: Matthew Garrett > --- > drivers/gpu/drm/i915/i915_dma.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c > index 3b315ba..23b6292 100644 > --- a/drivers/gpu/drm/i915/i915_dma.c > +++ b/drivers/gpu/drm/i915/i915_dma.c > @@ -1661,6 +1661,9 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) > /* Must be done after probing outputs */ > intel_opregion_init(dev); > acpi_video_register(); > + /* Don't use ACPI backlight functions on Windows 8 platforms */ > + if (acpi_osi_version() >= ACPI_OSI_WIN_8) > + acpi_video_backlight_unregister(); > } > > if (IS_GEN5(dev)) > -- > 1.8.2.1 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/dri-devel --089e01293fe293264d04decd53e4 Content-Type: text/x-patch; charset=US-ASCII; name="0001-drm-radeon-don-t-provide-ACPI-backlight-if-firmware-.patch" Content-Disposition: attachment; filename="0001-drm-radeon-don-t-provide-ACPI-backlight-if-firmware-.patch" Content-Transfer-Encoding: base64 X-Attachment-Id: f_hhrqkrhm0 RnJvbSBjNmVhZDM0MjlmZDM5NzdiNGIyZWU1NzQ4ZDgzYzcyMjcyNTkyYjI5IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBBbGV4IERldWNoZXIgPGFsZXhhbmRlci5kZXVjaGVyQGFtZC5j b20+CkRhdGU6IE1vbiwgMTAgSnVuIDIwMTMgMTA6MDU6NDMgLTA0MDAKU3ViamVjdDogW1BBVENI XSBkcm0vcmFkZW9uOiBkb24ndCBwcm92aWRlIEFDUEkgYmFja2xpZ2h0IGlmIGZpcm13YXJlIGV4 cGVjdHMKIFdpbmRvd3MgOAoKV2luZG93cyA4IGxlYXZlcyBiYWNrbGlnaHQgY29udHJvbCB1cCB0 byBpbmRpdmlkdWFsIGdyYXBoaWNzIGRyaXZlcnMgcmF0aGVyCnRoYW4gbWFraW5nIEFDUEkgY2Fs bHMgaXRzZWxmLgoKVW50ZXN0ZWQuCgpTaWduZWQtb2ZmLWJ5OiBBbGV4IERldWNoZXIgPGFsZXhh bmRlci5kZXVjaGVyQGFtZC5jb20+Ci0tLQogZHJpdmVycy9ncHUvZHJtL3JhZGVvbi9hdG9tYmlv c19lbmNvZGVycy5jIHwgICAgNCArKysrCiAxIGZpbGVzIGNoYW5nZWQsIDQgaW5zZXJ0aW9ucygr KSwgMCBkZWxldGlvbnMoLSkKCmRpZmYgLS1naXQgYS9kcml2ZXJzL2dwdS9kcm0vcmFkZW9uL2F0 b21iaW9zX2VuY29kZXJzLmMgYi9kcml2ZXJzL2dwdS9kcm0vcmFkZW9uL2F0b21iaW9zX2VuY29k ZXJzLmMKaW5kZXggNDEyMGQzNS4uYmM5ZTAwNyAxMDA2NDQKLS0tIGEvZHJpdmVycy9ncHUvZHJt L3JhZGVvbi9hdG9tYmlvc19lbmNvZGVycy5jCisrKyBiL2RyaXZlcnMvZ3B1L2RybS9yYWRlb24v YXRvbWJpb3NfZW5jb2RlcnMuYwpAQCAtMjMzLDYgKzIzMywxMCBAQCB2b2lkIHJhZGVvbl9hdG9t X2JhY2tsaWdodF9pbml0KHN0cnVjdCByYWRlb25fZW5jb2RlciAqcmFkZW9uX2VuY29kZXIsCiAK IAlEUk1fSU5GTygicmFkZW9uIGF0b20gRElHIGJhY2tsaWdodCBpbml0aWFsaXplZFxuIik7CiAK KwkvKiBEb24ndCB1c2UgQUNQSSBiYWNrbGlnaHQgZnVuY3Rpb25zIG9uIFdpbmRvd3MgOCBwbGF0 Zm9ybXMgKi8KKwlpZiAoYWNwaV9vc2lfdmVyc2lvbigpID49IEFDUElfT1NJX1dJTl84KQorCQlh Y3BpX3ZpZGVvX2JhY2tsaWdodF91bnJlZ2lzdGVyKCk7CisKIAlyZXR1cm47CiAKIGVycm9yOgot LSAKMS43LjcuNQoK --089e01293fe293264d04decd53e4--