当我按下Ctrl+ Alt+ F1-6时，屏幕变黑了。tty 不在屏幕外，我尝试按住字母来检查，但这不是问题，它只是保持全黑。我可以毫无问题地切换回 GUI ( Ctrl+ Alt+ )。F7
我正在使用带有 AMD Radeon R9 270X GPU 的 Ubuntu 14.04 LTS。
以下是输出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驱动：
$ 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
我尝试查找一些相关错误，dmesg但没有什么与 fglrx 相关的有趣内容：
$ 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
我已经尝试过这个指南：黑色 tty 1-6 屏幕但它没有帮助。仍然有黑色的 tty。
我该如何修复它？