Bug#692361: ACPI display backlight brightness is set to zero at every boot-up (HP Folio 13-2000)
Am Montag, den 05.11.2012, 12:45 +0100 schrieb Stefan Nagy:
Since I didn't encounter this problem before
linux-image-3.6-trunk-amd64 I had a look at these settings on
linux-image-3.2.0-4-amd64 with normal backlight brightness:
'acpi_video0' (brightness 0, actual_brightness 0),
'intel_backlight' (brightness 4882, actual_brightness 4882). So the
difference between 3.2 and 3.6 seems to be that backlight brightness
wasn't controlled by the ACPI driver but the device specific driver in
3.2.
I was having the same problem with linux-image-3.2.0-4-amd64 for some
time now, I guess since update 3.2.32-1.
However, this bug was fixed upstream. I tested the patch on top of
kernel v3.2.32-1 and it fixes the problem.
From 117af51d695c78bfdf618a183664f0e9f3769b9a Mon Sep 17 00:00:00 2001
From: Zhang Rui rui.zh...@intel.com
Date: Sun, 2 Dec 2012 10:00:41 +0800
Subject: [PATCH] ACPI video: ignore BIOS initial backlight value for HP Folio
13-2000.
Or else the laptop will boot with a dimmed screen.
Signed-off-by: Zhang Rui rui.zh...@intel.com
---
drivers/acpi/video.c | 14 ++
1 file changed, 14 insertions(+)
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 1e0a9e1..58bddd3 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -389,6 +389,12 @@ static int __init video_set_bqc_offset(const struct dmi_system_id *d)
return 0;
}
+static int video_ignore_initial_backlight(const struct dmi_system_id *d)
+{
+ use_bios_initial_backlight = 0;
+ return 0;
+}
+
static struct dmi_system_id video_dmi_table[] __initdata = {
/*
* Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -433,6 +439,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, Aspire 7720),
},
},
+ {
+ .callback = video_ignore_initial_backlight,
+ .ident = HP Folio 13-2000,
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, Hewlett-Packard),
+ DMI_MATCH(DMI_PRODUCT_NAME, HP Folio 13 - 2000 Notebook PC),
+ },
+ },
{}
};
--
1.7.9.5
Bug#692361: ACPI display backlight brightness is set to zero at every boot-up (HP Folio 13-2000)
Am Montag, den 05.11.2012, 12:45 +0100 schrieb Stefan Nagy:
Since I didn't encounter this problem before
linux-image-3.6-trunk-amd64 I had a look at these settings on
linux-image-3.2.0-4-amd64 with normal backlight brightness:
'acpi_video0' (brightness 0, actual_brightness 0),
'intel_backlight' (brightness 4882, actual_brightness 4882). So the
difference between 3.2 and 3.6 seems to be that backlight brightness
wasn't controlled by the ACPI driver but the device specific driver in
3.2.
I was having the same problem with linux-image-3.2.0-4-amd64 for some
time now, I guess since update 3.2.32-1.
However, this bug was fixed upstream. I tested the patch on top of
kernel v3.2.32-1 and it fixes the problem.
From 117af51d695c78bfdf618a183664f0e9f3769b9a Mon Sep 17 00:00:00 2001
From: Zhang Rui rui.zh...@intel.com
Date: Sun, 2 Dec 2012 10:00:41 +0800
Subject: [PATCH] ACPI video: ignore BIOS initial backlight value for HP Folio
13-2000.
Or else the laptop will boot with a dimmed screen.
Signed-off-by: Zhang Rui rui.zh...@intel.com
---
drivers/acpi/video.c | 14 ++
1 file changed, 14 insertions(+)
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 1e0a9e1..58bddd3 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -389,6 +389,12 @@ static int __init video_set_bqc_offset(const struct dmi_system_id *d)
return 0;
}
+static int video_ignore_initial_backlight(const struct dmi_system_id *d)
+{
+ use_bios_initial_backlight = 0;
+ return 0;
+}
+
static struct dmi_system_id video_dmi_table[] __initdata = {
/*
* Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -433,6 +439,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, Aspire 7720),
},
},
+ {
+ .callback = video_ignore_initial_backlight,
+ .ident = HP Folio 13-2000,
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, Hewlett-Packard),
+ DMI_MATCH(DMI_PRODUCT_NAME, HP Folio 13 - 2000 Notebook PC),
+ },
+ },
{}
};
--
1.7.9.5
Bug#692361: ACPI display backlight brightness is set to zero at every boot-up (HP Folio 13-2000)
tags 692361 - fixed-upstream quit Hi Stefan, Stefan Nagy wrote: However, this bug was fixed upstream. I tested the patch on top of kernel v3.2.32-1 and it fixes the problem. [...] From: Zhang Rui rui.zh...@intel.com Date: Sun, 2 Dec 2012 10:00:41 +0800 Subject: [PATCH] ACPI video: ignore BIOS initial backlight value for HP Folio 13-2000. Or else the laptop will boot with a dimmed screen. Signed-off-by: Zhang Rui rui.zh...@intel.com --- drivers/acpi/video.c | 14 ++ 1 file changed, 14 insertions(+) This patch does not seem to be part of linux-next nor in lenb's tree, unfortunately. Please let us know when it is accepted upstream. Based on https://bugs.launchpad.net/bugs/1066211 I fear we haven't gotten to the bottom of this, since the quirk table entry only applies to your model whereas a fundamental fix would apply to all affected ones. Thanks, Jonathan -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#692361: ACPI display backlight brightness is set to zero at every boot-up (HP Folio 13-2000)
Hi Jonathan, This patch does not seem to be part of linux-next nor in lenb's tree, unfortunately. Please let us know when it is accepted upstream. OK, sure. I presumed it was accepted already since Zhang Rui marked it as RESOLVED CODE_FIX. Based on https://bugs.launchpad.net/bugs/1066211 I fear we haven't gotten to the bottom of this, since the quirk table entry only applies to your model whereas a fundamental fix would apply to all affected ones. I know, but as I understand it, this issue is caused by a BIOS bug, so there seems to be no way to provide a fundamental fix (at least that's how I interpreted the mere existence of this quirk table). Cheers, Stefan. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
