Проблемы с графикой в ​​Ubuntu 14.04 Lenovo Thinkpad W540

Недавно у меня проблемы с графикой, и мой компьютер работает сравнительно медленно. У меня есть следующая ошибка из моего ядра:

cat /var/log/kern.log | grep failed [121792.821076] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [121792.827083] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [121796.838749] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [166910.746085] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [166910.752098] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [169118.271216] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [169118.277014] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [169140.653737] Freezing of tasks failed after 20.006 seconds (1 tasks refusing to freeze, wq_busy=0): [169140.727093] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [169140.732969] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [169145.090743] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [169155.277671] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [169155.283461] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [169328.691935] Freezing of tasks failed after 20.007 seconds (1 tasks refusing to freeze, wq_busy=0): [169328.770065] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [169328.775894] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [169362.526724] Freezing of tasks failed after 20.005 seconds (1 tasks refusing to freeze, wq_busy=0): [169362.633597] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [169362.639387] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [169403.965727] Freezing of tasks failed after 20.007 seconds (1 tasks refusing to freeze, wq_busy=0): [169404.042353] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training [169404.048149] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization [ 0.235773] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 7.532302] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 0.389624] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 85.143742] CIFS VFS: cifs_mount failed w/return code = -115 [ 0.235796] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 7.748205] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 0.242944] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 0.238618] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 7.443180] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 9.983506] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 3345.671018] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 0.238784] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 6.375705] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 8.810912] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 0.239961] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM [ 6.412908] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 [ 8.835804] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16 

Аналогично, выход из

 sudo lshw -c video 

является

 *-display description: VGA compatible controller product: GK106GLM [Quadro K2100M] vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller bus_master cap_list rom configuration: driver=nouveau latency=0 resources: irq:49 memory:b0000000-b0ffffff memory:80000000-8fffffff memory:90000000-91ffffff ioport:4000(size=128) memory:b1000000-b107ffff *-display description: VGA compatible controller product: 4th Gen Core Processor Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 06 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:46 memory:b1400000-b17fffff memory:a0000000-afffffff ioport:5000(size=64) 

Выход

 ubuntu-drivers devices 

является

 == /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 == modalias : pci:v000010DEd000011FCsv000017AAsd00002211bc03sc00i00 vendor : NVIDIA Corporation driver : nvidia-352 - third-party free driver : nvidia-355 - third-party free recommended driver : nvidia-346 - third-party free driver : nvidia-346-updates - distro non-free driver : nvidia-340 - third-party free driver : nvidia-340-updates - distro non-free driver : xserver-xorg-video-nouveau - distro free builtin 

Мне пришлось исправить замороженный ноутбук из-за ошибки графики в последнее время. Не могли бы вы найти причину ошибки и решения.