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I've started using a Technika LCD TV with my PC and, while it displays full OS graphics, the text that is usually displayed during boot up (with the exception of the initial BIOS screen) does not show - the screen goes blank. I can sometimes see text for a brief fraction of a second before it disappears from the screen.
The TV's on-screen display menu will also not show during times when the text does not show but it occasionally shows a "No signal" message. The OSD menu will display again as soon as the OS graphics appears.
The main problem this causes me is when I test a new graphics driver in Ubuntu and it fails I cannot see any text on the screen to type command line instructions.
From some initial research I know that video cards can output in two modes - text mode and graphics mode.
Another situation that involved a blank screen output was while playing a 3D game in full screen. I changed the game resolution mid-game and the screen went blank.
Please clarify why this problem is happening and tell me how I can use the console when the Linux graphics driver fails to load. Thanks.
UPDATE I am pretty sure it is to do with my HDTV not supporting the resolutions being used in each blanks screen scenario. Can this be fixed in Grub? See Reducing video mode switching during Linux boot. I am unsure about Grub and its settings.)
Technical info: Nvidia GeForce 9600 graphics adapter connected to a Technika LCD 32" TV via a VGA cable connected to a DVI adapter/port on the computer. My working resolution in Ubuntu is 1360x768 but according to the TV's OSD menu the TV is operating at 1280x768 resolution.
Unfortunately, I can't get into Ubuntu. I'd use a computer monitor to test but my monitor broke. I might have to try and borrow a monitor but it would take a while. – authentictech – 2013-09-01T12:19:11.790
The menu only provides an auto-position option but not an auto-sync option. I have some other menu items: H-Position, V-Position (obvious what they are), Phase, and Dot Clock (no idea what they are but they seem to auto-adjust). I added some detail to the question - the OSD menu won't display during the problem output mode - it just disappears (not a timeout issue because I am moving the options around as it happens). I can guess the correct key presses to select options to boot into Windows safe mode (this is when the display goes blank) and then the TV menu comes back when Windows loads up. – authentictech – 2013-09-01T12:24:48.937
You can step through the TV's menus to the auto-position item while having output and "learn" the steps (e.g. menu, down, OK, down, right, down, ...) and then do it blind when the problem shows up. – Markus N. – 2013-09-02T10:43:16.023
A good idea but, unfortunately, the auto-position didn't do anything to rectify the situation. – authentictech – 2013-09-04T10:54:46.433
I've rewritten the question with what I think is better additional info. Also, having got my graphics driver working again in Ubuntu, I pressed Ctl-Alt-F1 and Ctl-Alt-F2 (up tp F6) and both produced blank output and a "No signal" message on the TV's OSD. – authentictech – 2013-09-16T01:15:34.203
After setting GRUB_GFXMODE=1024x768 and GRUB_GFXPAYLOAD_LINUX=keep I can now see the console after pressing CTRL+ALT+F1 (...F6). Also, instead of the "no signal" message after selecting a grub menu option, I see the brown screen with the Ubuntu loading image (very briefly, but that's probably a good thing). I still am not able to use Memtest from the grub menu but I expect this may be unresolvable (correct me if I am wrong) without just getting a proper monitor. – authentictech – 2013-10-04T14:36:53.187
I will mark this as the answer and I think I will edit out the Windows related stuff and post a new question for getting into safe mode as I don't think that's resolvable using grub and a different skillset is required to answer. Thanks for the help. – authentictech – 2013-10-04T14:37:48.080