[Intel-gfx] Black screen on external VGA

[Stefano Avallone]

Opened fd.o bug #26840.

Thank you!

On Tuesday 02 March 2010 02:14:23 ykzhao wrote:
> On Mon, 2010-03-01 at 23:13 +0800, Stefano Avallone wrote:
> > Hi,
> 
> Hi,
> 	Will you please open a new bug  on
> bugs.freedesktop.org(Product=xorg, component = driver/intel) and attach
> the following info:
>     1. add the boot option of "drm.debug=0x06" and attach the output of
> dmesg.
>     2. attach the output of intel_reg_dumper
>     3. add the "modedebug" option in xorg.conf and attach the output of
> Xorg.0.log ( Option "modedebug" "enabled")
> 
> 
> thanks.
>     Yakui
> 
> > 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