Atheros QCA9565/AR9565 の動作がおかしい (aht9k に関連?)

Question

Qualcomm Atheros QCA9565/AR9565 の動作がおかしくなり始めました。信号がまったく届かず、AP が見つからないか、見つけても接続できないことがあります。

バックポートをコンパイルすると問題が解決する可能性があると読みましたが、成功しませんでした。バックポート (正確には 4.4.2-1) をインストールしようとしていますが、コマンドを実行すると次のエラーが発生しますmake。

  CC [M]  /home/glauco/Downloads/backports-4.4.2-1/compat/main.o
In file included from /home/glauco/Downloads/backports-4.4.2-1/backport-include/backport/backport.h:7:0,
                 from <command-line>:0:
./include/asm-generic/qrwlock.h: In function ‘__qrwlock_write_byte’:
/home/glauco/Downloads/backports-4.4.2-1/backport-include/linux/kconfig.h:25:28: error: implicit declaration of function ‘config_enabled’ [-Werror=implicit-function-declaration]
 #define IS_BUILTIN(option) config_enabled(option)
                            ^
./include/asm-generic/qrwlock.h:156:26: note: in expansion of macro ‘IS_BUILTIN’
  return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
                          ^
./include/asm-generic/qrwlock.h:156:37: error: ‘CONFIG_CPU_BIG_ENDIAN’ undeclared (first use in this function)
  return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
                                     ^
/home/glauco/Downloads/backports-4.4.2-1/backport-include/linux/kconfig.h:25:43: note: in definition of macro ‘IS_BUILTIN’
 #define IS_BUILTIN(option) config_enabled(option)
                                           ^
./include/asm-generic/qrwlock.h:156:37: note: each undeclared identifier is reported only once for each function it appears in
  return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
                                     ^
/home/glauco/Downloads/backports-4.4.2-1/backport-include/linux/kconfig.h:25:43: note: in definition of macro ‘IS_BUILTIN’
 #define IS_BUILTIN(option) config_enabled(option)
                                           ^
cc1: some warnings being treated as errors
scripts/Makefile.build:294: recipe for target '/home/glauco/Downloads/backports-4.4.2-1/compat/main.o' failed
make[5]: *** [/home/glauco/Downloads/backports-4.4.2-1/compat/main.o] Error 1
scripts/Makefile.build:567: recipe for target '/home/glauco/Downloads/backports-4.4.2-1/compat' failed
make[4]: *** [/home/glauco/Downloads/backports-4.4.2-1/compat] Error 2
Makefile:1524: recipe for target '_module_/home/glauco/Downloads/backports-4.4.2-1' failed
make[3]: *** [_module_/home/glauco/Downloads/backports-4.4.2-1] Error 2
Makefile.build:6: recipe for target 'modules' failed
make[2]: *** [modules] Error 2
Makefile.real:88: recipe for target 'modules' failed
make[1]: *** [modules] Error 2
Makefile:40: recipe for target 'install' failed
make: *** [install] Error 2

Dell Inspiron 15 (I15-5547-A10 モデル) で Elementary OS (Ubuntu 16 ベースの OS) を実行しています。