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Forçage résolution 1366x768 même si l'écran veut pas



Bonjour, 

cela fait plusieurs écran "a priori identique" (3-4) ou la résolution
1366x768 ne pose pas de problème.
Mais là j'en ai un qui m'ennuie il passe systématiquement en 1024x768 ou
1280x1024 (ce qui ne m'interresse pas)

par contre si j'étais le moniteur. je lance xorg. je rallume le moniteur :
la résolution 1366x768 est bien correctement utilisé.

je pense qu'il faut feinter avec le modeline et les frequences de
rafraichissement, mais je vois pas trop comment faire .
gtf ne m'a pas vraiment aidé : cf les 2  "Modeline "1366x768"" présent
dans mon xorg 




grep 136[068] /var/log/Xorg.0.log
(II) intel(0): h_active: 1360  h_sync: 1432  h_sync_end 1568 h_blank_end
1776 h_border: 0
(II) intel(0): h_active: 1360  h_sync: 1416  h_sync_end 1552 h_blank_end
1744 h_border: 0
(II) intel(0): DDCModeFromDetailedTiming: 1360x768 Warning: We only handle
seperate sync.
(II) intel(0): Modeline "1360x768"   84.75  1360 1432 1568 1776  768 771
776 798 -hsync -vsync
(II) intel(0): DDCModeFromDetailedTiming: 1360x768 Warning: We only handle
seperate sync.
(II) intel(0): Modeline "1366x768"x71.0  103.15  1368 1448 1592 1816  768
769 772 800 (56.8 kHz)
(II) intel(0): Modeline "1360x768"x59.8   84.75  1360 1432 1568 1776  768
771 776 798 -hsync -vsync (47.7 kHz)
(II) intel(0): [drm] init sarea width,height = 1368 x 1368 (pitch 2048)

un xdpyinfo me retourne ceci :
screen #0:
  dimensions:    1024x768 pixels (260x195 millimeters)
  resolution:    100x100 dots per inch
  depths (7):    24, 1, 4, 8, 15, 16, 32
  root window id:    0x72
  depth of root window:    24 planes

j'utilise les entrées suivantes de mon xorg.conf :
(**) |-->Screen "Default Screen" (0)
(**) |   |-->Monitor "MIRAI16:9"
(**) |   |-->Device "Intel Corporation 82G33/G31 Express Integrated
Graphics Controller"


mon xorg.conf est celui-ci :
Section "Files"
EndSection
Section "Modes"
        Identifier "ModesLCD"
        #Modeline "1366x768" 104.73 1368 1448 1592 1816 768 769 772 801
        Modeline "1366x768" 103.15 1368 1448 1592 1816 768 769 772 800
EndSection

Section "ServerFlags"
Option "AIGLX" "off"
EndSection

Section "Extensions"
Option "Composite" "Disable"
EndSection

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "CoreKeyboard"
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "pc105"
        Option          "XkbLayout"     "fr"
        Option          "XkbVariant"    "latin9"
EndSection

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"
        Option          "CorePointer"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "ImPS/2"
        Option          "Emulate3Buttons"       "true"
EndSection


Section "Device"
        Identifier      "Intel Corporation 82G33/G31 Express Integrated
Graphics Controller"
        #Driver         "vesa"
        Driver          "intel"
        Option          "Monitor Layout" "CRT, CRT"
        #Option "DDC"   "off"
        #Option          "LinearAlloc"   "16384"
        BusID           "PCI:0:2:0"
EndSection

Section "Monitor"
        Identifier      "MIRAI16:9"
        UseModes        "ModesLCD"
        Option          "DPMS"
        #HorizSync       36-64
        #VertRefresh     56-75
EndSection
Section "Screen"
        Identifier      "Default Screen"
        Device          "Intel Corporation 82G33/G31 Express Integrated
Graphics Controller"
        #Monitor                "Écran générique"
        Monitor         "MIRAI16:9"
        DefaultDepth    24
        SubSection "Display"
                #Modes          "1280x1024" "1024x768" "800x600"
                Modes           "1366x768@60" "1366x768" "1360x768"
"1368x768" "1280x720"

        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Default Screen"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
EndSection




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