[Intel-gfx] Black screen on external VGA

[Stefano Avallone]

Hi,

I get a black screen (no signal) on external VGA when trying:

xrandr --output VGA1 --mode 1024x768

I have a laptop with 965GM, kernel 2.6.33, xorg 1.7.5, libdrm 2.4.18, mesa 
7.7, xf86-video.intel 2.10.0 as packaged by Archlinux 64-bit. I am running KDE 
4.4.

I also tried to restart X server after connecting the VGA cable, but I still 
get no output on VGA, while getting a proper resolution (matching those on the 
VGA monitor) on LVDS1, as reported by Xorg.0.log (complete log attached):

(II) intel(0): Creating default Display subsection in Screen section
	"Builtin Default intel Screen 0" for depth/fbbpp 24/32
(==) intel(0): Depth 24, (--) framebuffer bpp 32
(==) intel(0): RGB weight 888
(==) intel(0): Default visual is TrueColor
(II) intel(0): Integrated Graphics Chipset: Intel(R) 965GM
(--) intel(0): Chipset: "965GM"
(==) intel(0): video overlay key set to 0x101fe
(II) intel(0): Output VGA1 has no monitor section
(II) intel(0): Output LVDS1 has no monitor section
(II) intel(0): found backlight control interface 
/sys/class/backlight/acpi_video1
(II) intel(0): Output TV1 has no monitor section
(II) intel(0): EDID vendor "@@@", prod id 0
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  600 601 605 
628 +hsync +vsync (37.9 kHz)
(II) intel(0): Modeline "800x600"x0.0   36.00  800 824 896 1024  600 601 603 
625 +hsync +vsync (35.2 kHz)
(II) intel(0): Modeline "640x480"x0.0   31.50  640 656 720 840  480 481 484 
500 -hsync -vsync (37.5 kHz)
(II) intel(0): Modeline "640x480"x0.0   31.50  640 664 704 832  480 489 492 
520 -hsync -vsync (37.9 kHz)
(II) intel(0): Modeline "640x480"x0.0   25.18  640 656 752 800  480 490 492 
525 -hsync -vsync (31.5 kHz)
(II) intel(0): Modeline "720x400"x0.0   28.32  720 738 846 900  400 412 414 
449 -hsync +vsync (31.5 kHz)
(II) intel(0): Modeline "1280x1024"x0.0  135.00  1280 1296 1440 1688  1024 
1025 1028 1066 +hsync +vsync (80.0 kHz)
(II) intel(0): Modeline "1024x768"x0.0   78.75  1024 1040 1136 1312  768 769 
772 800 +hsync +vsync (60.0 kHz)
(II) intel(0): Modeline "1024x768"x0.0   75.00  1024 1048 1184 1328  768 771 
777 806 -hsync -vsync (56.5 kHz)
(II) intel(0): Modeline "1024x768"x0.0   65.00  1024 1048 1184 1344  768 771 
777 806 -hsync -vsync (48.4 kHz)
(II) intel(0): Modeline "800x600"x0.0   49.50  800 816 896 1056  600 601 604 
625 +hsync +vsync (46.9 kHz)
(II) intel(0): Modeline "800x600"x0.0   50.00  800 856 976 1040  600 637 643 
666 +hsync +vsync (48.1 kHz)
(II) intel(0): Modeline "640x360"x70.0   20.58  640 648 712 784  360 361 364 
375 -hsync +vsync (26.2 kHz)
(II) intel(0): Modeline "640x480"x0.0   36.00  640 696 752 832  480 481 484 
509 -hsync -vsync (43.3 kHz)
(II) intel(0): Modeline "800x600"x0.0   56.25  800 832 896 1048  600 601 604 
631 +hsync +vsync (53.7 kHz)
(II) intel(0): Modeline "1024x768"x0.0   94.50  1024 1072 1168 1376  768 769 
772 808 +hsync +vsync (68.7 kHz)
(II) intel(0): Modeline "1152x864"x0.0  108.00  1152 1216 1344 1600  864 865 
868 900 +hsync +vsync (67.5 kHz)
(II) intel(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 1688  1024 
1025 1028 1066 +hsync +vsync (64.0 kHz)
(II) intel(0): Modeline "1280x1024"x0.0  157.50  1280 1344 1504 1728  1024 
1025 1028 1072 +hsync +vsync (91.1 kHz)
(II) intel(0): Output VGA1 connected
(II) intel(0): Output LVDS1 connected
(II) intel(0): Output TV1 disconnected
(II) intel(0): Using fuzzy aspect match for initial modes
(II) intel(0): Output VGA1 using initial mode 1024x768
(II) intel(0): Output LVDS1 using initial mode 1024x768
(II) intel(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.
(==) intel(0): DPI set to (96, 96)

xrandr -q:

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 
0mm
   1280x1024      85.0     75.0     60.0
   1152x864       75.0
   1024x768       85.0*    75.1     70.1     60.0
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     60.0
   720x400        70.1
LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 
0mm
   1280x800       59.9 +
   1024x768       85.0*    75.0     70.1     60.0
   832x624        74.6
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     59.9
   720x400        85.0
   640x400        85.1
   640x350        85.1
TV1 disconnected (normal left inverted right x axis y axis)


Anyone can help me? That would be much appreciated.

Thanks,
Stefano

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