On Sun, Jan 22, 2012 at 02:55, Alfonso Fiore <alfonso.fiore at gmail.com> wrote: > On Sat, Jan 21, 2012 at 10:09 PM, Daniel Vetter <daniel at ffwll.ch> wrote: >> >> 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? > > Hi Daniel, > > I used this TV for the last 3 years connecting each and all my laptops > and I never had a problem running 1024x768 with Windows over VGA (as > an extension of my laptop). > However cheap my VGA input might be, Windows handles it just fine. > My current GPU is ATI mobility radeon HD 3400. > If you want, I can try to run Ubuntu from USB on my laptop and see if > Ubuntu can control my monitor over VGA. > Let me know if this test helps at all (I would prefer to skip it if > the info I provided are enough). > > I don't have other desktops. > The only box I can try for POST over VGA is an ALIX > (http://pcengines.ch/) and it also doesn't work very well with my TV > but at least it shows a flickering image. > > Again, with laptops and Windows it has been running fine for ages over VGA. Ok, so we can't blame the TV ;-) > Also: I'm sure you are looking at the big picture, but my goal is for > sure HDMI, not VGA. > >> The overscan is expected because your other output HDMI is still at >> 1024x768 and hence your desktop is large enough to fit both. >> >> See the first line starting with "Screen 0:" in the xrandr output for >> current the size of your desktop. > > gotcha. Thanks. I didn't know that (but I could have thought about it...) > >> Yep, excellent test descriptions! I still need to look at the register >> dumps, but I think another test might be useful: >> >> Only HDMI with nomodeset, then again grab the intel_reg_dump. Iirc that >> works, so it could be useful to see how the bios sets things up with just >> the hdmi cable. > > is there a typo? Or maybe I don't understand what you are asking? > "grab the intel_reg_dump. Iirc that works" ???? > is that intel_reg_dumper? > > So you want me to run the same script over HDMI (with only HDMI cable) > with nomeset with all the available resolutions? Actually I only need the output of intel_reg_dumper, resolution doesn't really matter that much. It just needs to be a HDMI-only configuration that works. >> 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 > > Should I try just with 60? Or also with other values? > Is this test with or without nomodeset (I guess w/o, but better check)? > Only VGA cable? or also HDMI connected? or both cases? > > Please detail case conditions. Test with the i915 driver (i.e. no nomodeset on the kernel cmdline), if you want you can try both VGA cable only and VGA/HDMI but it shouldn't matter. xrandr -q output shows only 55.4 and 60.0 for this resolution, so I think it doesn't make sense to test anything else. Yours, Daniel -- Daniel Vetter daniel.vetter at ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch
