什么是“盖德设备不符合SW_LID。”卑劣？

Question

这意味着什么，我该如何纠正呢？

# cat /var/log/messages | grep -a 'lid'
Mar 22 00:36:00 debian kernel: [ 1039.517767] ACPI: button: The lid device is not compliant to SW_LID.

系统：

# uname -a
Linux debian 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux

Answer 1

此消息来自drivers/acpi/button.c，它是Linux内核中ACPI_BUTTON模块的一部分。

例如，在linux-source-4.19/drivers/acpi/button.c after行171下可以找到它：

194 /* Complain the buggy firmware */
195 pr_warn_once("The lid device is not compliant to SW_LID.\n");

如您所见，当检测到buggy固件时，将打印此消息。该评论继续说：

196 /*
197  * Send the unreliable complement switch event:
.    *
.    * On most platforms, the lid device is reliable. However
.    * there are exceptions:
.    * 1. Platforms returning initial lid state as "close" by
.    *    default after booting/resuming:
.    *     https://bugzilla.kernel.org/show_bug.cgi?id=89211
.    *     https://bugzilla.kernel.org/show_bug.cgi?id=106151
.    * 2. Platforms never reporting "open" events:
.    *     https://bugzilla.kernel.org/show_bug.cgi?id=106941
.    * On these buggy platforms, the usage model of the ACPI
.    * lid device actually is:
.    * 1. The initial returning value of _LID may not be
.    *    reliable.
.    * 2. The open event may not be reliable.
.    * 3. The close event is reliable.
.    *
.    * But SW_LID is typed as input switch event, the input
.    * layer checks if the event is redundant. Hence if the
.    * state is not switched, the userspace cannot see this
.    * platform triggered reliable event. By inserting a
.    * complement switch event, it then is guaranteed that the
.    * platform triggered reliable one can always be seen by
.    * the userspace.
222  */

如何解决它-这只是一个诊断信息，如果一切都好，你可以忽略它。如果有些东西不起作用，您应该访问上面发布的链接，为您所拥有的特定硬件寻找可能的解决方案，或者尝试升级计算机的固件，但不幸的是，Linux并不总是能够实现的。