我的 Ubuntu 16.04.2 系统几乎从来都无法在 CMDLINE 中没有“radeon.modeset=0”标志的情况下启动。即使它能够正常启动且图形完全正常工作，也会随机地冻结在某个屏幕上（什么都不起作用！）。现在我正在从同一个系统打字，我害怕关闭这个系统，因为我不知道它是否会正常启动。我尝试了很多方法来解决这个问题，比如删除 fglrx-* 软件包、完全重新安装 xorg-server、安装 AMD 的专有驱动程序（但没有成功），但问题仍然存在。以下是当前启动的一些 DMESG 日志：
dmesg | grep radeon
[ 20.338211] [drm] radeon kernel modesetting enabled.
[ 20.811775] fb: switching to radeondrmfb from EFI VGA
[ 20.812316] radeon 0000:00:01.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[ 20.812319] radeon 0000:00:01.0: GTT: 1024M 0x0000000020000000 - 0x000000005FFFFFFF
[ 20.812421] [drm] radeon: 512M of VRAM memory ready
[ 20.812423] [drm] radeon: 1024M of GTT memory ready.
[ 21.299901] [drm] radeon: dpm initialized
[ 21.467270] radeon 0000:00:01.0: WB enabled
[ 21.467274] radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8800adb27c00
[ 21.468017] radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0xffffc90001435a18
[ 21.488049] radeon 0000:00:01.0: fence driver on ring 6 use gpu addr 0x0000000020000c18 and cpu addr 0xffff8800adb27c18
[ 21.488054] radeon 0000:00:01.0: fence driver on ring 7 use gpu addr 0x0000000020000c1c and cpu addr 0xffff8800adb27c1c
[ 21.488057] radeon 0000:00:01.0: fence driver on ring 1 use gpu addr 0x0000000020000c04 and cpu addr 0xffff8800adb27c04
[ 21.488059] radeon 0000:00:01.0: fence driver on ring 2 use gpu addr 0x0000000020000c08 and cpu addr 0xffff8800adb27c08
[ 21.488062] radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8800adb27c0c
[ 21.488064] radeon 0000:00:01.0: fence driver on ring 4 use gpu addr 0x0000000020000c10 and cpu addr 0xffff8800adb27c10
[ 21.488071] radeon 0000:00:01.0: radeon: MSI limited to 32-bit
[ 21.488108] radeon 0000:00:01.0: radeon: using MSI.
[ 21.488137] [drm] radeon: irq initialized.
[ 23.230164] [drm] radeon atom DIG backlight initialized
[ 23.652404] fbcon: radeondrmfb (fb0) is primary device
[ 23.652642] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[ 23.718196] [drm] Initialized radeon 2.43.0 20080528 for 0000:00:01.0 on minor 0
[ 23.718324] radeon 0000:01:00.0: enabling device (0000 -> 0003)
[ 23.809280] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[ 23.809288] radeon 0000:01:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF
[ 23.809321] [drm] radeon: 1024M of VRAM memory ready
[ 23.809324] [drm] radeon: 1024M of GTT memory ready.
[ 24.631934] [drm] radeon: dpm initialized
[ 24.703143] radeon 0000:01:00.0: WB enabled
[ 24.703147] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 24.703150] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 24.704678] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
[ 24.704685] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[ 24.704733] radeon 0000:01:00.0: radeon: using MSI.
[ 24.704857] [drm] radeon: irq initialized.
[ 25.635447] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[ 25.635640] [drm] Initialized radeon 2.43.0 20080528 for 0000:01:00.0 on minor 1
[ 33.270152] radeon 0000:01:00.0: WB enabled
[ 33.270157] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 33.270160] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 33.271687] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
[ 54.562435] radeon 0000:01:00.0: WB enabled
[ 54.562439] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 54.562442] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 54.563971] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
[ 2456.807100] radeon 0000:01:00.0: WB enabled
[ 2456.807105] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 2456.807108] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 2456.808649] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
[ 2457.995824] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2459.015301] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2460.034789] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2461.054276] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2462.073763] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2463.093252] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2464.111716] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2465.131204] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2466.150691] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2467.170179] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2467.190169] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, giving up!!!
[ 2467.190223] [drm:evergreen_startup.part.13 [radeon]] *ERROR* radeon: error initializing UVD (-1).
[ 2469.072416] radeon 0000:00:01.0: WB enabled
[ 2469.072419] radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8800adb27c00
[ 2469.073152] radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0xffffc90001435a18
[ 2469.093200] radeon 0000:00:01.0: fence driver on ring 6 use gpu addr 0x0000000020000c18 and cpu addr 0xffff8800adb27c18
[ 2469.093202] radeon 0000:00:01.0: fence driver on ring 7 use gpu addr 0x0000000020000c1c and cpu addr 0xffff8800adb27c1c
[ 2469.093203] radeon 0000:00:01.0: fence driver on ring 1 use gpu addr 0x0000000020000c04 and cpu addr 0xffff8800adb27c04
[ 2469.093205] radeon 0000:00:01.0: fence driver on ring 2 use gpu addr 0x0000000020000c08 and cpu addr 0xffff8800adb27c08
[ 2469.093207] radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8800adb27c0c
[ 2469.093208] radeon 0000:00:01.0: fence driver on ring 4 use gpu addr 0x0000000020000c10 and cpu addr 0xffff8800adb27c10
[ 2471.236519] radeon 0000:01:00.0: WB enabled
[ 2471.236522] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 2471.236524] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 2471.238066] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
[ 2472.428332] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2473.444731] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2474.463881] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2475.480701] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2476.499584] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2477.516671] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2478.534445] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2479.551648] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2480.569168] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2481.586626] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, trying to reset the VCPU!!!
[ 2481.606616] [drm:uvd_v1_0_start [radeon]] *ERROR* UVD not responding, giving up!!!
[ 2481.606648] [drm:evergreen_startup.part.13 [radeon]] *ERROR* radeon: error initializing UVD (-1).
[ 2563.237858] radeon 0000:01:00.0: WB enabled
[ 2563.237862] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 2563.237865] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 2563.239393] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
[ 2565.960240] radeon 0000:00:01.0: WB enabled
[ 2565.960243] radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8800adb27c00
[ 2565.960976] radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0xffffc90001435a18
[ 2565.981017] radeon 0000:00:01.0: fence driver on ring 6 use gpu addr 0x0000000020000c18 and cpu addr 0xffff8800adb27c18
[ 2565.981019] radeon 0000:00:01.0: fence driver on ring 7 use gpu addr 0x0000000020000c1c and cpu addr 0xffff8800adb27c1c
[ 2565.981021] radeon 0000:00:01.0: fence driver on ring 1 use gpu addr 0x0000000020000c04 and cpu addr 0xffff8800adb27c04
[ 2565.981022] radeon 0000:00:01.0: fence driver on ring 2 use gpu addr 0x0000000020000c08 and cpu addr 0xffff8800adb27c08
[ 2565.981024] radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8800adb27c0c
[ 2565.981025] radeon 0000:00:01.0: fence driver on ring 4 use gpu addr 0x0000000020000c10 and cpu addr 0xffff8800adb27c10
[ 2568.128559] radeon 0000:01:00.0: WB enabled
[ 2568.128562] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8800a799cc00
[ 2568.128564] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8800a799cc0c
[ 2568.130118] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001c32118
以及有关显示驱动程序的一些信息：
lspci -k | grep -A3 VGA
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7420G]
DeviceName: AMD TRINITY SCRAPPER MOBILE LITE Graphics
Subsystem: Hewlett-Packard Company Trinity [Radeon HD 7420G]
Kernel driver in use: radeon
--
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7500M/7600M Series] (rev ff)
DeviceName: AMD Radeon HD 7600M Series Graphics
Kernel driver in use: radeon
Kernel modules: radeon
如果您有任何解决方案/建议，请告诉我。谢谢。