| From fedbe9bc6fd3e14b1ffbb3dac407777ac4a3650c Mon Sep 17 00:00:00 2001 |
| From: Alex Hung <alex.hung@canonical.com> |
| Date: Tue, 28 May 2013 02:05:09 +0000 |
| Subject: ACPI / video: ignore BIOS initial backlight value for HP m4 |
| |
| From: Alex Hung <alex.hung@canonical.com> |
| |
| commit fedbe9bc6fd3e14b1ffbb3dac407777ac4a3650c upstream. |
| |
| On HP m4 lapops, BIOS reports minimum backlight on boot and |
| causes backlight to dim completely. This ignores the initial backlight |
| values and set to max brightness. |
| |
| References: https://bugs.launchpad.net/bugs/1184501 |
| Signed-off-by: Alex Hung <alex.hung@canonical.com> |
| Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/acpi/video.c | 8 ++++++++ |
| 1 file changed, 8 insertions(+) |
| |
| --- a/drivers/acpi/video.c |
| +++ b/drivers/acpi/video.c |
| @@ -447,6 +447,14 @@ static struct dmi_system_id video_dmi_ta |
| DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"), |
| }, |
| }, |
| + { |
| + .callback = video_ignore_initial_backlight, |
| + .ident = "HP Pavilion m4", |
| + .matches = { |
| + DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), |
| + DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"), |
| + }, |
| + }, |
| {} |
| }; |
| |
