On Sat, Jan 21, 2012 at 10:09:16PM +0100, Daniel Vetter wrote: > On Fri, Jan 20, 2012 at 12:37:25AM +0100, Alfonso Fiore wrote: > > On Thu, Jan 19, 2012 at 9:50 PM, Daniel Vetter <daniel at ffwll.ch> wrote: > > > > > > Ok, please make this _really_ precise, we need to know exactly when things > > > work and when not. I presume this was showing a perfect screen over the > > > HDMI cable? > > > > Yes, I was referring to HDMI. In fact, I was never able to see anything over VGA > > with this MB + CPU (I never tried VGA with H55 + i3 550 cause HDMI worked > > but I used VGA from my laptop with the same cable and the same TV). > > Interestingly, I can always see BIOS and BIOS menu over HDMI > > but when I connect only VGA I can't see anything also at the BIOS level. > > So maybe the VGA problem has nothing to do with the driver? > > [I was wrong, I managed to see something over VGA during these tests] > > > > I'll try to be as precise as I can. > > > > so I created a little script that I will run at each test. > > > > $ cat run_me.sh > > #!/bin/bash > > WHEN="`date +%Y%m%d_%H%M%S`" > > xrandr -q > ./xrand-q.$WHEN.output > > xrandr --verbose > ./xrand--verbose.$WHEN.output > > dmesg > ./dmesg.$WHEN.output > > cp /var/log/Xorg.0.log ./Xorg.0.$WHEN.output > > cp /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1/edid > > ./EDID_VGA.$WHEN.output > > cp /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid > > ./EDID_HDMI.$WHEN.output > > $HOME/test_GPU/intel_gpu_tools/intel-gpu-tools-1.1/tools/intel_reg_dumper > > > ./intel_reg_dumper.$WHEN.output > > > > And attached you can find the whole tgz. Here I simply walk you > > through my tests. > > > > TEST-01 > > ======== > > Only VGA (DVI-I) connected. > > Changing TV source to VGA. > > Reboot. > > Nothing shows on the screen (not even BIOS). > > But LightDM started (I can connect with VNC). > > FOLDER=VGA_cable_VGA_source_1024_768 > > > > TEST-02 > > ======== > > NO reboot > > NO cable change (Only VGA (DVI-I) connected and TV source to VGA) > > xrandr --output VGA1 --mode 800x600 (from VNC) > > well... amazing. I can see the screen. I get no overscan left/right > > but a bit up/down > > FOLDER=VGA_cable_VGA_source_800_600 > > Ok, from the above it looks like the VGA input on your TV is dirt-cheap > and it barely manages to sync at 800x600 and fails already at 1024x768 - > not even the bios manages to put a picture on your TV :( > > To make sure that this is not an issue with the intel gpu, can you maybe > test the vga input with another machine with different gpu? Another thing to try with VGA is whether the higher refresh-rate helps. You can select that with --rate, i.e. xrandr --output VGA1 --mode 1024x768 --rate 60.0 -Daniel -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
