From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Packard Subject: Re: Screen goes blank @30 seconds into boot Date: Thu, 26 Jan 2012 10:11:02 -0800 Message-ID: <86d3a6bah5.fsf@sumi.keithp.com> References: <1327578888.2530.1.camel@aragorn.hsd1.ga.comcast.net.> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0567892138==" Return-path: Received: from keithp.com (home.keithp.com [63.227.221.253]) by gabe.freedesktop.org (Postfix) with ESMTP id 663C59E76B for ; Thu, 26 Jan 2012 10:11:08 -0800 (PST) In-Reply-To: <1327578888.2530.1.camel@aragorn.hsd1.ga.comcast.net.> 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: Joel Heaton , intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org --===============0567892138== Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" --=-=-= Content-Transfer-Encoding: quoted-printable On Thu, 26 Jan 2012 06:54:48 -0500, Joel Heaton wrot= e: > System: Dell Inspiron One > Chipset: intel H61 Express > CPU: Intel Pentium Dual Core Intel Core i3/i5i7 (this machine is > probably an i3 > Video: Intel HD/HD 2000/HD 3000 > Max Resolution: 1920x1080 > OS-1 Windows 7 (shipped with this OS) > OS-2 Debian Sid liquorix kernel 3.2 > DE: lxde no DM I start x manually > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > When booting the screen goes blank about 80% through the boot cycle. > The system is still running, I can log in blind and execute reboot > command. Is the monitor backlight on or off? If off, can you try finding a bright light and shining it on the monitor to see if the image is present, but the backlight simply disabled? > I ssh into the system from another computer. > kern.log reports "Firmware Bug: ACPI: No _BQC method, cannot determine > initial brightness" The last bug we saw with this was a system that did leave the monitor off. Here's a patch that fixed that machine: Keith Packard (December 31) (lkml me patch sent) Subject: [PATCH] acpi/video: Don't restore backlight to 0 at boot time To: linux-kernel@vger.kernel.org Cc: Keith Packard , Bdale Garbee , Matthe= w Garrett Date: Sat, 31 Dec 2011 00:52:27 -0800 If the initial ACPI reported backlight level is zero, or larger than max_level, then ignore it and set the level back to the current level instead. This avoids ending up with a black screen on an HP Pavilion G series G4 notebook QE040UA#ABA. Reported-by: Bdale Garbee Cc: Bdale Garbee Cc: Matthew Garrett Signed-off-by: Keith Packard =2D-- drivers/acpi/video.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 08a44b5..688f342 100644 =2D-- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -711,7 +711,7 @@ acpi_video_init_brightness(struct acpi_video_device *de= vice) * when invoked for the first time, i.e. level_old is invalid. * set the backlight to max_level in this case */ =2D if (use_bios_initial_backlight) { + if (use_bios_initial_backlight && 0 < level_old && level_old <=3D max_le= vel) { for (i =3D 2; i < br->count; i++) if (level_old =3D=3D br->levels[i]) level =3D level_old; =2D-=20 1.7.7.3 =2D-=20 keith.packard@intel.com --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIVAwUBTyGXNjYtFsjWk68qAQjm7BAA2q8HYsXFSmw/3MQBlXS943MjfcvGg7b3 MfRf6qupgyQTYrgJ0F/xx2EiL2PEf1QOCoPNeDq1IoHrl75Nc2D2veFBv6CtHpof ZUuITEXEL9jQ3SO0ssvS1s7MhlJ8S+//CIo2fGSSCIM6j7i+oTNRzXJGUe1juWrr GVA1yEhyUPnlvZlm/M9rjD2DPOh2jyFJNcgRAUn5jrrTdziaiev3z6iGlTmF9Ga3 z9I/UY0Vov/dBxxuwOKBrmg65iJrNPS/jU6D23PcRrWNh0ppXjFju7lyy1gQhqMo 7EWyyhyPK0iviEvKHsdlF8igPefUegkX7epyE2pPYf8I/HjEBbAgN46gFVoDAwR8 knAKLILVP0PWZ0KO1CgHsAha5ClhupRrO+QR24QqzZyK7c6Qg0VKVGDB/OTms7vZ 4wO3qgpiyJ7nU++YQ3MZavUUoXY3YUWTxih96KtnV2mdOZkb1s4JU1yPtG33KBUh kT3WMyM1Fqu/QBiqHg6YwSVmtGeWGSWy8mOL8X5+y5IaaDjV1UT4SyQlh9cbXddw wNUciS1i3TEjuqusFBZEKWVqdNcyiwCbvEq3dA5rN6QJ2Tq5d8E7yQ+fcE8yTws6 Ucl3nnnF7I5rET3/U03i11g6QJhDsMfzv/NpPfQvH/3bCMvg6NjL0gFCi2ZpK4Tl D1AtRx6NShk= =rTsB -----END PGP SIGNATURE----- --=-=-=-- --===============0567892138== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx --===============0567892138==--