https://bugzilla.kernel.org/show_bug.cgi?id=35622
Aaron Lu <aaron...@intel.com> changed:
What |Removed |Added
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CC| |aaron...@intel.com
--- Comment #42 from Aaron Lu <aaron...@intel.com> 2013-03-14 06:03:48 ---
(In reply to comment #40)
> I've examined acer-wmi.c and found out that patch is probably no longer
> needed.
> I've tested two kernels: 3.5.4 and 3.6.0. In 3.5.4 with
> 'acpi_backlight=vendor'
> everything works fine (keys/KDE controls). Without 'acpi_backlight' parameter
> message 'acer_wmi: Brightness must be controlled by generic video driver' is
Yes, the message means acpi video is in charge of backlight control, not
acer_wmi. And acpi video driver can't handle backlight for your system.
> printed and keys don't work. However, KDE backlight controls still work
> (/sys/class/backlight/intel_backlight is present).
Does /sys/class/backlight/acpi_video0 exist?
> In 3.6.0 keys don't work regardless of 'acpi_backlight' parameter (above
> message is always printed).
I suppose there is a "Disabling ACPI video driver" message printed in v3.6? If
so, you can try the following patch to see if it works around your problem:
diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index c9076bd..137bebc 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -2229,8 +2229,8 @@ static int __init acer_wmi_init(void)
interface->capability &= ~ACER_CAP_BRIGHTNESS;
pr_info("Brightness must be controlled by acpi video driver\n");
} else {
- pr_info("Disabling ACPI video driver\n");
- acpi_video_unregister();
+// pr_info("Disabling ACPI video driver\n");
+// acpi_video_unregister();
}
if (wmi_has_guid(WMID_GUID3)) {
Thanks.
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