xorg resolution
sudo lshw | grep display glxinfo lspci | grep VGA lspci -nn | grep ATI 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI RV635 [Mobility Radeon HD 3650] [1002:9591] Monitor name: LP154WX4-TLC8 LGPhilipsLCD
monitor sending bad (or no) resolution information to the driver. The driver then restricts itself to common defaults (e.g. 640x480 or 800x600, or sometimes 1024x768). Sometimes a bad cable is at fault.
sudo get-edid
dice: DDC2 transfers
higher refresh rates (to avoid "flicker") were useful on CRTs because of the technology involved. The phosphors on the CRT would decay(lose brightness) if they weren't refreshed quickly enough and that could cause eyestrain. An LCD monitor doesn't work that way, basically it remains in state until changed.
gedit /var/log/Xorg.0.log (II) VESA(0): Not using mode "1280x1024" (no mode of this name) No valid modes left. Trying less strict filter...
VESA, ATI or Intel?:
sudo apt-get install xresprobe sudo ddcprobe
ATI fglrx drivers
sudo apt-get purge nvidia* sudo dpkg-reconfigure xserver-xorg sudo aticonfig --help radeontool --help sudo apt-get install fglrx-updates ./amd-driver-installer-12.6-legacy-x86.x86_64.run less /usr/share/ati/fglrx-install.log sudo aticonfig --initial -f sudo aticonfig --acpi-services=off
calcola i parametri adatti alla risoluzione
cvt 1024 1080 61 # 1024x1080 60.94 Hz (CVT) hsync: 68.31 kHz; pclk: 94.00 MHz Modeline "1024x1080_61.00" 94.00 1024 1096 1200 1376 1080 1083 1093 1121 -hsync +vsync xrandr --newmode 1024_1080 94.00 1024 1096 1200 1376 1080 1083 1093 1121 -hsync +vsync xrandr --addmode 1024_1080 xrandr --output default --mode 1024_1080 error: xrandr: Failed to get size of gamma for output default
xrandr -s 800x600 -r 61 xrandr -s 1024x768 -r 61
xorg.conf: There should be none;if there is one,it should not be empty.
/etc/X11/xorg.conf sudo service gdm stop sudo Xorg -configure sudo service gdm start sudo dpkg-reconfigure xserver-xorg
Section "Screen" Identifier "aticonfig-Screen[0]-0" Device "aticonfig-Device[0]-0" Monitor "aticonfig-Monitor[0]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1280x1024" "1024x768" "640x480" EndSubSection SubSection "Display" Depth 16 Modes "1600x1200" "1280x1024" "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Depth 24 Modes "1600x1200" "1280x1024" "1024x768" "800x600" "640x480" EndSubSection EndSection
Section "Monitor" Identifier "LGPhilipsLCD LP154WX4-TLC8" Option "DPMS" HorizSync 30-81 VertRefresh 56-76 EndSection Section "Screen" Identifier "Default Screen" Device "Intel X4500" Monitor "LGPhilipsLCD LP154WX4-TLC8" DefaultDepth 24 SubSection "Display" Modes "1280x800" EndSubSection EndSection
locate MonitorsDB