On Thu, 26 Jan 2012 06:54:48 -0500, Joel Heaton <jheat...@comcast.net> wrote: > 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 > ========================================= > 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 <kei...@keithp.com> (December 31) (lkml me patch sent)
Subject: [PATCH] acpi/video: Don't restore backlight to 0 at boot time
To: linux-ker...@vger.kernel.org
Cc: Keith Packard <kei...@keithp.com>, Bdale Garbee <bd...@gag.com>, Matthew
Garrett <m...@redhat.com>
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 <bd...@gag.com>
Cc: Bdale Garbee <bd...@gag.com>
Cc: Matthew Garrett <m...@redhat.com>
Signed-off-by: Keith Packard <kei...@keithp.com>
---
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
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -711,7 +711,7 @@ acpi_video_init_brightness(struct acpi_video_device *device)
* when invoked for the first time, i.e. level_old is invalid.
* set the backlight to max_level in this case
*/
- if (use_bios_initial_backlight) {
+ if (use_bios_initial_backlight && 0 < level_old && level_old <=
max_level) {
for (i = 2; i < br->count; i++)
if (level_old == br->levels[i])
level = level_old;
--
1.7.7.3
--
keith.pack...@intel.com
pgpGZhGXnivhZ.pgp
Description: PGP signature
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