Problema de desempenho de reprodução de vídeo Ubuntu 18.04

Desde a atualização para o Ubuntu 18.04 (de 17.10), comecei a ter grandes problemas de desempenho com a reprodução de vídeo, usando o VLC e o navegador (Youtube).

O problema fica mais aparente quanto maior a qualidade do vídeo (começa em 480p, 1080p é completamente inatacável). O vídeo está instável para dizer o mínimo.

Eu não tive esse problema usando o Ubuntu 17.10.

Gostaria de saber se há alguém que também teve o mesmo problema e encontrou uma causa potencial e talvez uma solução?

cpuinfo:

AMD A6-6310 APU with AMD Radeon R4 Graphics

glxinfo (arrumado):

name of display: :1
display: :1  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
GLX version: 1.4
GLX extensions:
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: VMware, Inc. (0xffffffff)
    Device: llvmpipe (LLVM 6.0, 128 bits) (0xffffffff)
    Version: 18.0.0
    Accelerated: no
    Video memory: 10965MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 3.3
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.0
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: llvmpipe (LLVM 6.0, 128 bits)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 18.0.0-rc5
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 18.0.0-rc5
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 18.0.0-rc5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:
264 GLXFBConfigs:

ATUALIZAR:

Parece que é um problema geral com a aceleração / renderização de hardware não ativada / reconhecida / funcionando.

As coisas que eu tentei até agora:

1. Reinicie.

2. Adicione o arquivo de configuração xorg.conf com:

   Section "Device"
       Identifier     "Device0"
       Driver         "radeon"
   EndSection
   

3. Reinstale xserver-xorg-video-radeon.

Infelizmente, nenhuma dessas coisas teve qualquer efeito.

Atualização # 2

Saída produzida por ubuntu-drivers debug:

=== log messages from detection ===
DEBUG:root:_get_db_name: output
ID_PCI_CLASS_FROM_DATABASE=Network controller
ID_PCI_SUBCLASS_FROM_DATABASE=Network controller
ID_VENDOR_FROM_DATABASE=Broadcom Limited
ID_MODEL_FROM_DATABASE=BCM43142 802.11b/g/n


DEBUG:root:_get_db_name(/sys/devices/pci0000:00/0000:00:02.3/0000:01:00.0, pci:v000014E4d00004365sv000017AAsd00000621bc02sc80i00): vendor "Broadcom Limited", model "BCM43142 802.11b/g/n"
DEBUG:root:Loading custom detection plugin /usr/share/ubuntu-drivers-common/detect/sl-modem.py
DEBUG:root:plugin /usr/share/ubuntu-drivers-common/detect/sl-modem.py return value: None
DEBUG:root:Loading custom detection plugin /usr/share/ubuntu-drivers-common/detect/arm-gles.py
DEBUG:root:plugin /usr/share/ubuntu-drivers-common/detect/arm-gles.py return value: None
DEBUG:root:Loading custom detection plugin /usr/share/ubuntu-drivers-common/detect/open-vm-dkms.py
DEBUG:root:plugin /usr/share/ubuntu-drivers-common/detect/open-vm-dkms.py return value: None
=== modaliases in the system ===
acpi:PNP0103:
pci:v00001022d00001566sv000017AAsd00003801bc06sc00i00
pci:v00001022d00001584sv00000000sd00000000bc06sc00i00
usb:v0BDAp0129d3960dcFFdscFFdpFFicFFisc06ip50in00
platform:rtsx_usb_ms
platform:rtsx_usb_sdmmc
usb:v0438p7900d0018dc09dsc00dp01ic09isc00ip00in00
usb:v1D6Bp0002d0415dc09dsc00dp00ic09isc00ip00in00
pci:v00001022d00001582sv00000000sd00000000bc06sc00i00
pci:v00001002d00009840sv000017AAsd00003801bc04sc03i00
input:b0000v0000p0000e0000-e0,5,kramlsfw6,8,
hdaudio:v1002AA01r00100500a01
pci:v000010ECd00008168sv000017AAsd00003812bc02sc00i00
pci:v00001022d00001580sv00000000sd00000000bc06sc00i00
pci:v00001022d0000780Dsv000017AAsd00003801bc04sc03i00
hdaudio:v14F1510Fr00100100a01
input:b0000v0000p0000e0000-e0,5,kramlsfw2,
input:b0000v0000p0000e0000-e0,5,kramlsfw4,
pci:v00001022d00007801sv000017AAsd00003801bc01sc06i01
pci:v00001022d0000156Bsv00000000sd00000000bc06sc00i00
pci:v00001022d0000780Bsv000017AAsd00003801bc0Csc05i00
pci:v00001022d00001585sv00000000sd00000000bc06sc00i00
pci:v00001022d00001537sv000017AAsd00003801bc10sc80i00
pci:v00001022d00001583sv00000000sd00000000bc06sc00i00
pci:v00001022d00007813sv000017AAsd00003801bc08sc05i01
usb:v1D6Bp0002d0415dc09dsc00dp01ic09isc00ip00in00
usb:v1D6Bp0003d0415dc09dsc00dp03ic09isc00ip00in00
pci:v00001022d00001581sv00000000sd00000000bc06sc00i00
pci:v00001002d00009851sv000017AAsd00003801bc03sc00i00
pci:v000014E4d00004365sv000017AAsd00000621bc02sc80i00
usb:v5986p0652d3652dcEFdsc02dp01ic0Eisc01ip00in00
input:b0003v5986p0652e3652-e0,1,kD4,ramlsfw
usb:v5986p0652d3652dcEFdsc02dp01ic0Eisc02ip00in01
usb:v105BpE065d0112dcFFdsc01dp01icFFisc01ip01in01
usb:v105BpE065d0112dcFFdsc01dp01icFFiscFFipFFin02
usb:v105BpE065d0112dcFFdsc01dp01icFFisc01ip01in00
usb:v105BpE065d0112dcFFdsc01dp01icFEisc01ip01in03
pci:v00001022d0000780Esv000017AAsd00003801bc06sc01i00
acpi:PNP0800:
acpi:PNP0C04:
acpi:PNP0C09:
acpi:VPC2004:
input:b0019v0000p0000e0000-e0,1,4,k94,95,BA,BE,C0,C1,CA,CB,D4,E3,F0,F7,ram4,lsfw
acpi:PNP0C0A:
acpi:ACPI0003:
platform:regulatory
platform:microcode
acpi:PNP0C0D:
platform:vboxdrv
platform:pcspkr
platform:Fixed MDIO bus
acpi:PNP0C0C:
serio:ty01pr00id00ex00
input:b0011v0002p000Ee0000-e0,1,3,k110,111,145,14A,14D,14E,14F,ra0,1,18,1C,2F,30,35,36,39,3A,mlsfw
input:b0011v0001p0001eAB83-e0,1,4,11,14,k71,72,73,74,75,76,77,79,7A,7B,7C,7D,7E,7F,80,8C,8E,8F,9B,9C,9D,9E,9F,A3,A4,A5,A6,AC,AD,B7,B8,B9,D9,E2,ram4,l0,1,2,sfw
cpu:type:x86,ven0002fam0016mod0030:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0017,0018,0019,001A,001C,0020,0021,0022,0023,0024,0025,0026,0027,0028,0029,002B,002C,002D,002E,002F,0030,0031,0034,0036,0037,0038,0039,003A,003B,003D,0064,0068,006E,0070,0072,0073,0074,0075,0078,0079,007A,007C,0080,0081,0083,0089,008D,0093,0094,0096,0097,0099,009A,009B,009C,009D,009E,00C0,00C1,00C2,00C3,00C4,00C5,00C6,00C7,00C8,00C9,00CA,00CC,00CD,00D6,00D8,00DA,00DB,00DC,00E2,00E8,00EC,00ED,00F3,010F,0123,0140,01C2,01E0,01E1,01E2,01E3,01E4,01E6,01E7,01EA,01EB,01EC,0220
acpi:LNXSYSTM:
acpi:LNXSYBUS:
acpi:LNXCPU:
input:b0019v0000p0001e0000-e0,1,k74,ramlsfw
acpi:PNP0C0F:
acpi:PNP0A08:PNP0A03:
acpi:LNXVIDEO:
acpi:PNP0100:
acpi:PNP0C01:
acpi:PNP0000:
acpi:PNP0C02:
acpi:ETD0624:ETD0000:PNP0F13:
acpi:MSFT0001:PNP0303:
acpi:PNP0B00:
acpi:PNP0200:
input:b0019v0000p0006e0000-e0,1,kE0,E1,E3,F1,F2,F3,F4,F5,ramlsfw
input:b0019v0000p0005e0000-e0,5,kramlsfw0,
dmi:bvnLENOVO:bvrA2CN36WW(V2.04):bd04/30/2015:svnLENOVO:pn80E3:pvrLenovoG50-45:rvnLENOVO:rnLancer5B2:rvrNotDefined:cvnLENOVO:ct10:cvrLenovoG50-45:
=== matching driver packages ===
bcmwl-kernel-source: installed: 6.30.223.271+bdcom-0ubuntu4   available: 6.30.223.271+bdcom-0ubuntu4 (auto-install)  [distro]  non-free  modalias: pci:v000014E4d00004365sv000017AAsd00000621bc02sc80i00  path: /sys/devices/pci0000:00/0000:00:02.3/0000:01:00.0  vendor: Broadcom Limited  model: BCM43142 802.11b/g/n

Saída produzida por sudo lspci -nnk | grep -i vga -A3:

00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R4/R5 Graphics] [1002:9851]
Subsystem: Lenovo Mullins [Radeon R4/R5 Graphics] [17aa:3801]
Kernel driver in use: radeon
Kernel modules: radeon, amdgpu

Saída produzida por sudo lshw -c display:

  *-display                 
       description: VGA compatible controller
       product: Mullins [Radeon R4/R5 Graphics]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 1
       bus info: pci@0000:00:01.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:37 memory:e0000000-efffffff memory:f0000000-f07fffff ioport:3000(size=256) memory:f0c00000-f0c3ffff memory:c0000-dffff

Este bug vale uma olhada.

https://bugs.launchpad.net/ubuntu/+source/nux/+bug/1767468

O sistema está procurando por suporte de unidade, não o encontra (porque a ferramenta que o verifica foi removida) e, portanto, desativa o hardware.

Funcionou para mim de qualquer maneira.

Editar: emita o comando sudo rm /etc/X11/Xsession.d/50_check_unity_supportque foi relatado como uma solução bem-sucedida para o problema.

Eu encontrei o mesmo problema. Somente o renderizador disponível foi llvm.

Depois de pesquisar bastante, percebi que, por causa de um erro diferente,
coloquei nomodesetgrub ( /etc/default/grub) na linhaGRUB_CMDLINE_LINUX_DEFAULT

Na minha configuração, a máquina funciona sem esse parâmetro.

Verifique se existe algum parâmetro nomodesetno grub e remova-o.
Tente se ajudar.