Poll: Does ACPI lid state work on your Linux laptop?
Hans de Goede
hdegoede at redhat.com
Wed Jul 13 14:57:55 UTC 2011
On 07/13/2011 04:11 PM, Adam Jackson wrote:
> On Wed, 2011-07-13 at 15:22 +0300, Pasi Kärkkäinen wrote:
>> On Tue, Jul 12, 2011 at 10:01:25PM +0100, Matthew Garrett wrote:
>>> Please don't. ACPI lid state is not reliable on a range of hardware for
>>> a bunch of reasons, ranging from open events that are never fired to
>>> query methods that read from the wrong register. We can't pay attention
>>> to it by default, and running a survey doesn't change that.
>> Ok. Do you know if there are other (better working) methods to get the lid state info?
> If we knew of any, they'd be implemented in the kernel, and we'd be
> using them.
> I know this is a frustrating thing to hear, and I empathize, I really
> do. But the state of the art right now is that there's one interface
> for laptop lids, it's in ACPI, and it's not reliable.
> Once upon a time there was an effort to make a Linux-based test kit for
> firmware , so vendors could run it before releasing hardware and
> verify that the Linux interfaces function. Lid state and lid events
> could have been one such test case. Sadly the effort seems to have
> stagnated; it could really use a revival. But even such a test kit
> would only fix new hardware, existing machines will continue to be as
> broken as they currently are forever.
Maybe it it is an idea to build a whitelist for machines which do
have working ACPI lid support? I realize maintaining such a list is
a pain, but this way people who care and are lucky enough to have actually
working hardware can at least use this ?
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