Hi Alex,
On 03/17/2015 10:31 AM, Rafael J. Wysocki wrote:
> On Saturday, March 14, 2015 08:46:25 PM Alex Hung wrote:
>> Rafael,
>>
>> Do you mean /sys/class/backlight/intel_backlight? It works but acpi_video fails.
Is it the hotkey broken with Win8 OSI or the acpi_video interface?
If it is just the interface, then you can add the system into the dmi
table in drivers/acpi/video.c with video_disable_native_backlight as
the DMI callback function.
Thanks,
Aaron
>>
>> We have some cases that needs working acpi_video interfaces. I'd also
>> like to backport to previous kernels that has not use native backlight
>
> If backlight is the only reason, we don't add machines to blacklist.c any
> more.
>
>
>> On Wed, Mar 11, 2015 at 6:20 AM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
>>> On Tuesday, March 03, 2015 02:39:14 PM Alex Hung wrote:
>>>> The brightness hotkeys of HP Pavilion dv6 does not work with Win8 OSI. Due
>>>> to insufficient documentation for the driver implementation, blacklist
>>>> it as a workaround.
>>>
>>> I gather that the native backlight interface doesn't work on those systems too,
>>> is that correct?
>>>
>>>> Signed-off-by: Alex Hung <alex.hung@xxxxxxxxxxxxx>
>>>> ---
>>>> drivers/acpi/blacklist.c | 12 ++++++++++++
>>>> 1 file changed, 12 insertions(+)
>>>>
>>>> diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
>>>> index 9b693d5..98aa360 100644
>>>> --- a/drivers/acpi/blacklist.c
>>>> +++ b/drivers/acpi/blacklist.c
>>>> @@ -300,6 +300,18 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
>>>> },
>>>>
>>>> /*
>>>> + * The brightness hotkeys do not work on those machines when
>>>> + * returning true for _OSI("Windows 2012")
>>>> + */
>>>> + {
>>>> + .callback = dmi_disable_osi_win8,
>>>> + .ident = "HP Pavilion dv6",
>>>> + .matches = {
>>>> + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
>>>> + DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6 Notebook PC"),
>>>> + },
>>>> + },
>>>> + /*
>>>> * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
>>>> * Linux ignores it, except for the machines enumerated below.
>>>> */
>>>>
>>>
>
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