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امکانات وب
Hello, I have Lenovo T420 and Ubuntu 14.04. It works OK in my office where I have two monitors coected to it: VGA and DP with laptop display off (with it on there are crazy artifacts) and it is OK. In BIOS I have set display to "discrete graphics" which is Nvidia NVS4200 GPU. Optimus does work only if I boot into Windows.
I wanted to coect a Samsung 4K TV to it, but it has only HDMI input and laptop has DisplayPort++ 1.2 output, so I bought this expensive DisplayPort - HDMI converter cable but it seems useless so far 
When I boot without the DP cable coected and coect the TV after I am logged into mate desktop, it shows "Samsung electric 47" in "monitors" applet correctly and even sets the right 4K resolution at 30Hz, but the TV has no signal. I have nouveau driver installed. Maybe it is incompatible with something. Changing resolution to lower or discoecting the TV usually results in a total screen scramble and necessity to tu off laptop by holding power button.
Code:
vitas@T420-vitas:~$ xrandr Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192 LVDS-1 coected 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 174mm 1600x900 60.0*+ 1152x864 60.0 1024x768 59.9 800x600 59.9 640x480 59.4 720x400 59.6 640x400 60.0 640x350 59.8 VGA-1 discoected (normal left inverted right x axis y axis) DP-1 discoected (normal left inverted right x axis y axis) DP-2 discoected (normal left inverted right x axis y axis) DP-3 discoected (normal left inverted right x axis y axis) vitas@T420-vitas:~$ lsmod | grep nouveau nouveau 1097199 3 mxm_wmi 13021 1 nouveau i2c_algo_bit 13413 1 nouveau ttm 93424 1 nouveau drm_kms_helper 55071 1 nouveau drm 303102 5 ttm,drm_kms_helper,nouveau wmi 19177 2 mxm_wmi,nouveau video 19476 1 nouveau vitas@T420-vitas:~$ dpkg -l|grep nouveau ii libdrm-nouveau2:amd64 2.4.60-2~ubuntu14.04.1 amd64 Userspace interface to nouveau-specific keel DRM services -- runtime ii xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 amd64 X.Org X server -- Nouveau display driver
Is it because it is DisplayPort++ allowing me to coect more monitors?I wonder if the converter may be faulty or the GPU in my thinkpad, because I have Windows 7 on another hdd in ultrabay and in it it also does not really work properly (but does not freeze the system at least
FullHD signal works and TV shows it OK. Any bigger resolution causes split second image flickers on the TV alteating with black image. But with Linux it does not even try nothing and TV still shows "no signal" !Any ideas or suggestions what can I do?
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نویسنده: استخدام کار