On Thu, Jan 19, 2012 at 08:56:44PM +0100, Alfonso Fiore wrote: > On Thu, Jan 19, 2012 at 4:37 PM, Daniel Vetter <daniel at ffwll.ch> wrote: > > > > Yeah, unfortunately Peter's interlaced patches have issues still on > > Sandybridge. Meanwhile you could try out all the modes the kernel detected > > from the edid with xrandr (also see whether picking a different refresh > > rate with --rate changes anything). If any of them work correctly (instead > > of the cut-in-half or tiny screen), that might be interesting to know. > > Hi, > > more tests with the drm-intel-fixes and no "nomoreset". > > I boot (as usual) just with HDMI cable. > > The PC boots in that weird way (I sent photos today) and then when I > login the screen is split. > > Interestingly, trying to connect the same screen over VGA (while > running and already connected over HDMI) makes X hang BUT it also > changes the way X shows: full screen, no flicker (i.e. as it should). > > when I restart X (sudo restart lightdm) I have a FANTASTIC PERFECT SCREEN! :) :) 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? Also please recheck for the split-screen issue whether that is some custom mode still lingering around by pasting xrandr -q output. For the broken case (i.e. only HDMI connected) also please try to change the resolution to something else like 1024x768 and see what happens. > $ 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) > 400mm x 300mm > 1024x768 60.0* > 800x600 60.3 56.2 > 848x480 60.0 > 640x480 59.9 > HDMI1 disconnected (normal left inverted right x axis y axis) > DP1 disconnected (normal left inverted right x axis y axis) > HDMI2 connected 1024x768+0+0 (normal left inverted right x axis y > axis) 640mm x 360mm > 1280x720 50.0 60.0 > 1024x768 60.0* > 800x600 60.3 > 720x576 50.0 > 720x480 59.9 59.9 > 640x480 60.0 59.9 > HDMI3 disconnected (normal left inverted right x axis y axis) > DP2 disconnected (normal left inverted right x axis y axis) > DP3 disconnected (normal left inverted right x axis y axis) > > 2nd test: I reboot again just with HDMI connected. > LightDM still looking "weird" (like today's picture) and after login > still split screen. > When I plug the VGA cable (over DVI-I) the screen goes black (not blue). > If I restart X the screen goes blue and then black and from VNC I can > see it's still 1024x768 (so why black?). > > xrandr -q didn't change. > > if I turn the TV over the VGA signal I get a very weird full green > image flickering very fast. > > 3rd test: I reboot again with both cables connected (VGA over DVI-I and HDMI). > > LightDM and X looks PERFECT! :) Both login screen and session looks > just like they should. > > 4rd test: same as previous but I want to check if it will happen the same way. > > Yes, again, LightDM and X looks PERFECT! Interestingly, if on the TV I > switch to VGA input I see a black screen... > > I attach the logs for this session, maybe you can figure out how to > have this behavior without VGA cable plugged in! > > about testing different resolutions. If I test them from THIS > situation (e.g. both cables connected from boot) I report the > following: > > xrandr --output HDMI2 --mode 1280x720 ===> I get quite a bit overscan > but the picture is stable > xrandr --output HDMI2 --mode 1024x768 ===> fits like a glove. Not a > pixel of overscan. Never had such a good fit over VGA with my laptop > and XP. > xrandr --output HDMI2 --mode 800x600 ===> this is quite hard to > explain. The "real" screen is 1024x768 but I can only see 800x600 but > X seems to know what's going on because it creates two sets of > controls, one aligned at 800, one aligned at 1024. I suspect you've had the other output still on with 1024x768. You can always double-check with xrandr, '*' marks the currently active mode (and at the top of each output you see which part of a possibly large desktop it scans out). > I guess the two screenshots will help you (one of the TV screen and > then a screen grab). > > > Maybe also attach the raw edid, you can find it in /sys/class/drm/*/edid > > for your TV. > > about my edid info: > > $ find /sys/ | grep edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1/edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-3/edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-2/edid > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-3/edid > > Interestingly enough the EDID I get from VGA is 256 bytes while EDID > from HDMI is 128 bytes... Yeah, that's common TV edid madness, they give you different stuff depending upon connector. Sometimes you get only TV-y modes on HDMI and all the default *VGA resolutions only on the dvi/vga port. Usually this is also good to explain the difference in overscan. For standard TV resolutions you get overscan, for *VGA resolutions you don't. Add to that the fact that some of the receivers in TV's are dirt-cheap and _only_ work with exactly the mode they spec in the edid. The result is what you've discovered ;-) > They are both in the logs. A few other things to test. - Check whether the edid changes when you connect only one cable. Yep, that can happen. - Check what happens when you only connect the VGA cable. - There's likely something broken within our driver if HDMI+VGA works, but HDMI alone not. The kernel/X also switch on the VGA output which might influence (but shouldn't) how we set up HDMI. To check that out please: Attach xrandr --verbose output for both configurations. Please ensure that you use the same resolution for both, i.e. for the HDMI+VGA case switch to 1280x720 for the HDMI output. Grab intel-gpu-tools v1.1 (hopefully your distro ships it) and run the intel_reg_dumper tool for both configurations (again, please ensure you use the same mode for HDMI and that you don't change anything between grabbing the xrandr output and the intel_reg_dumper output). Yours, Daniel -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
