Messages in this thread Patch in this message | | | From | Keith Packard <> | Subject | [PATCH] acpi/video: Don't restore backlight to 0 at boot time | Date | Sat, 31 Dec 2011 00:52:27 -0800 |
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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 <bdale@gag.com> Cc: Bdale Garbee <bdale@gag.com> Cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: Keith Packard <keithp@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
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