每個 tty (Ctrl+Alt+F1-6) 顯示黑屏

Question

當我點擊Ctrl+ Alt+ F1-時6，結果是黑屏。 tty 沒有離開螢幕，我嘗試按住字母進行檢查，但這不是問題，它只是保持全黑。我可以毫無問題地切換回 GUI ( Ctrl++ Alt) 。F7

我使用的是 Ubuntu 14.04 LTS 和 AMD Radeon R9 270X GPU。

這是輸出lspci：

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Curacao XT [Radeon R9 270X]

我使用Ubuntu提供的fglrx驅動程式：

$ fglrxinfo
display: :0  screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon R9 200 Series   
OpenGL version string: 4.4.13374 Compatibility Profile Context 15.20.1013

我試圖找到一些相關錯誤，dmesg但沒有與 fglrx 相關的有趣內容：

$ dmesg | grep fglrx
[   11.277446] fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, Starnberg, GERMANY' taints kernel.
[   11.284297] fglrx: module verification failed: signature and/or  required key missing - tainting kernel
[   11.297733] <6>[fglrx] Maximum main memory to use for locked dma buffers: 15638 MBytes.
[   11.297960] <6>[fglrx]   vendor: 1002 device: 6810 revision: 0 count: 1
[   11.298364] <6>[fglrx] ioport: bar 4, base 0xe000, size: 0x100
[   11.298619] <6>[fglrx] Kernel PAT support is enabled
[   11.298631] <6>[fglrx] module loaded - fglrx 15.20.2 [Feb 27 2015] with 1 minors
[   18.778958] <6>[fglrx] Firegl kernel thread PID: 1397
[   18.779024] <6>[fglrx] Firegl kernel thread PID: 1398
[   18.779087] <6>[fglrx] Firegl kernel thread PID: 1399
[   18.779176] <6>[fglrx] IRQ 33 Enabled
[   18.789875] <6>[fglrx] Reserved FB block: Shared offset:0, size:1000000 
[   18.789877] <6>[fglrx] Reserved FB block: Unshared offset:f7b4000, size:4000 
[   18.789878] <6>[fglrx] Reserved FB block: Unshared offset:f7b8000, size:548000 
[   18.789880] <6>[fglrx] Reserved FB block: Unshared offset:7ffee000, size:12000

我已經嘗試過這個指南：黑色 tty 1-6 螢幕但這沒有幫助。還是有黑色的tty。

我該如何修復它？