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Acer 5745G藍牙

致初接觸Linux或無從下手者

Acer 5745G Linux下關閉獨顯

人云E云 posted @ 2014年3月22日 15:20 in Linux with tags linux ArchLinux acer 5745g bbswitch dkms , 1264 阅读

本機相關基本情況：

顯卡：nvidia gt330m
雙顯卡切換技術：legacy optimus。
- 這是第二代技術，而一般意義上的optimus是第三代。
- 電腦C面有一個實體按鈕，在windows下的作用（需相應軟件和驅動）是切換顯卡。

本文所述內容該當可通用於所有此類電腦。（此技術用於多數gt330m及之前的雙顯卡筆記本）

關閉獨立顯卡使用了bbswitch。AUR上有bbswitch-dkms，當前的最新版本是0.8。

選擇dkms的目的在於我這裏有兩個內核，而arch官方源中的bbswitch是爲目前最新的3.13內核編譯的。

安裝過程不再贅述，裝好之後

sudo modprobe bbswitch load_state=0 unload_state=1

一下試試看能否載入。

若未提示錯誤，執行

lspci | grep VGA

看輸出。若獨立顯卡後邊顯示rev ff，則其應當已經被關閉。（可以考慮用電池測試一下耗電情況XD）

如果一切順利，做以下兩步：

在/etc/modules-load.d/bbswitch.conf中加入
```
bbswitch
```

在/etc/modprobe.d/bbswitch.conf中加入

options bbswitch load_state=0 unload_state=1

之後重啓，若未報錯，則已載入成功，獨顯也該當關閉。

享受續航提升之事吧:P

以上方法已在3.10-lts內核測試，理論上適用於3.12之前的內核。而3.12及以上版本內核由於某些原因（也許是電源管理方案變更）會有問題，~~至今沒有解決~~現時狀況見下。

[2014.4.27]

3.12版內核沒發現怎麼關閉掉，bbswitch會有問題。

3.13沒怎麼測試。

3.14下不再需要bbswitch（實話是如果使用依然會有錯），內核已經接手這個工作，會自動關閉獨顯。但是續航沒有達到上邊用bbswitch時候的狀態，具體原因不確定。

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