Linhas horizontais são exibidas após a instalação do Ubuntu 14.04

1

Após a instalação bem sucedida do Ubuntu (14.04), tenho um problema estranho que linhas horizontais aparecem de tempos em tempos na minha tela. Eu verifico no Windows7 e está tudo bem. Anteriormente, antes do formato, eu também tinha o Ubuntu 14.04 e não tive esse problema. Apenas uma linha aparece (em lugares diferentes) e desaparece no mesmo momento. Linhas mostra mesmo na tela de log do Ubuntu, isso acontece principalmente no início, depois de algum tempo ele quase pára.

vídeo: link (desculpe por baixa qualidade, mas você pode ver as linhas em 0:32, 0:47, 1:07, 1:33)

alguma informação:

przem@przem:~$ lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, 
Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 4330/4350/4550][1002:9552]
 przem@przem:~$ dmesg | egrep 'drm|radeon'
[   12.840642] [drm] Initialized drm 1.1.0 20060810
[   12.986443] [drm] radeon kernel modesetting enabled.
[   12.986517] fb: switching to radeondrmfb from VESA VGA
[   12.988823] [drm] initializing kernel modesetting (RV710 0x1002:0x9552 0x144D:0xC050).
[   12.988839] [drm] register mmio base: 0xCFEF0000
[   12.988841] [drm] register mmio size: 65536
[   12.989043] radeon 0000:01:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[   12.989047] radeon 0000:01:00.0: GTT: 1024M 0x0000000020000000 - 0x000000005FFFFFFF
[   12.989049] [drm] Detected VRAM RAM=512M, BAR=256M
[   12.989051] [drm] RAM width 64bits DDR
[   12.989509] [drm] radeon: 512M of VRAM memory ready
[   12.989511] [drm] radeon: 1024M of GTT memory ready.
[   12.989528] [drm] Loading RV710 Microcode
[   13.574567] [drm] radeon: dpm initialized
[   13.598034] [drm] GART: num cpu pages 262144, num gpu pages 262144
[   13.611820] [drm] PCIE GART of 1024M enabled (table at 0x000000000025E000).
[   13.611883] radeon 0000:01:00.0: WB enabled
[   13.611888] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffd36c00
[   13.611891] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffd36c0c
[   13.612891] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000000005c598 and cpu addr 0xf8e9c598
[   13.612895] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   13.612897] [drm] Driver supports precise vblank timestamp query.
[   13.612899] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[   13.612947] radeon 0000:01:00.0: radeon: using MSI.
[   13.612981] [drm] radeon: irq initialized.
[   13.659269] [drm] ring test on 0 succeeded in 1 usecs
[   13.659278] [drm] ring test on 3 succeeded in 4 usecs
[   13.834216] [drm] ring test on 5 succeeded in 1 usecs
[   13.834225] [drm] UVD initialized successfully.
[   13.834439] [drm] ib test on ring 0 succeeded in 0 usecs
[   13.834463] [drm] ib test on ring 3 succeeded in 0 usecs
[   14.480110] [drm] ib test on ring 5 succeeded
[   14.481403] [drm] radeon atom DIG backlight initialized
[   14.481406] [drm] Radeon Display Connectors
[   14.481408] [drm] Connector 0:
[   14.481410] [drm]   LVDS-1
[   14.481412] [drm]   DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
[   14.481414] [drm]   Encoders:
[   14.481415] [drm]     LCD1: INTERNAL_UNIPHY2
[   14.481417] [drm] Connector 1:
[   14.481418] [drm]   VGA-1
[   14.481420] [drm]   DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
[   14.481422] [drm]   Encoders:
[   14.481423] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[   14.481425] [drm] Connector 2:
[   14.481426] [drm]   HDMI-A-1
[   14.481428] [drm]   HPD1
[   14.481430] [drm]   DDC: 0x7fa0 0x7fa0 0x7fa4 0x7fa4 0x7fa8 0x7fa8 0x7fac 0x7fac
[   14.481431] [drm]   Encoders:
[   14.481433] [drm]     DFP1: INTERNAL_UNIPHY
[   15.459388] [drm] fb mappable at 0xD045F000
[   15.459392] [drm] vram apper at 0xD0000000
[   15.459394] [drm] size 4325376
[   15.459396] [drm] fb depth is 24
[   15.459397] [drm]    pitch is 5632
[   15.459512] fbcon: radeondrmfb (fb0) is primary device
[   15.459632] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[   15.459634] radeon 0000:01:00.0: registered panic notifier
[   15.478772] [drm] Initialized radeon 2.40.0 20080528 for 0000:01:00.0 on minor 0

Por favor me ajude a encontrar a solução.

    
por pb. 21.01.2016 / 22:13

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