* [9fans] 00E & projector @ 2003-02-01 13:29 sah 2003-02-01 15:37 ` Russ Cox 0 siblings, 1 reply; 7+ messages in thread From: sah @ 2003-02-01 13:29 UTC (permalink / raw) To: 9fans When I hook up our projector to the video out on my TP 600E I get an interesting result. The screen is properly exported to the projector all through the log on process, but once rio kicks up I lose the feed - presumably - and the screen goes blue (projector driven). Thoughts? Sam ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [9fans] 00E & projector 2003-02-01 13:29 [9fans] 00E & projector sah @ 2003-02-01 15:37 ` Russ Cox 2003-02-01 16:48 ` Sam 2003-02-01 17:58 ` Ronald G. Minnich 0 siblings, 2 replies; 7+ messages in thread From: Russ Cox @ 2003-02-01 15:37 UTC (permalink / raw) To: 9fans Are you running your screen at a higher resolution than the projector supports? That's what it sounds like. It's also possible we screwed up the CRT code -- it doesn't get exercised much -- but usually if you Fn-F7 to get it working before aux/vga, it keeps working. ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [9fans] 00E & projector 2003-02-01 15:37 ` Russ Cox @ 2003-02-01 16:48 ` Sam 2003-02-01 17:58 ` Ronald G. Minnich 1 sibling, 0 replies; 7+ messages in thread From: Sam @ 2003-02-01 16:48 UTC (permalink / raw) To: 9fans It's been a while since I've tried it (we gave up before because we didn't have time to debug the problem), but I believe I tried several different resolutions. I'm preparing for a talk in late Feb, so I'll poke at it some more and come back with data. Sam On Sat, 1 Feb 2003, Russ Cox wrote: > Are you running your screen at a higher resolution > than the projector supports? That's what it sounds > like. It's also possible we screwed up the CRT > code -- it doesn't get exercised much -- but usually > if you Fn-F7 to get it working before aux/vga, > it keeps working. > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [9fans] 00E & projector 2003-02-01 15:37 ` Russ Cox 2003-02-01 16:48 ` Sam @ 2003-02-01 17:58 ` Ronald G. Minnich 2003-02-25 14:01 ` Sam 1 sibling, 1 reply; 7+ messages in thread From: Ronald G. Minnich @ 2003-02-01 17:58 UTC (permalink / raw) To: 9fans On Sat, 1 Feb 2003, Russ Cox wrote: > Are you running your screen at a higher resolution > than the projector supports? That's what it sounds > like. It's also possible we screwed up the CRT > code -- it doesn't get exercised much -- but usually > if you Fn-F7 to get it working before aux/vga, > it keeps working. Another common problem when you go to graphics mode on older thinkpads -- there is a "feature" that doesn't work with all projectors in which the thinkpad hardware tries to autodetect external vga, and won't drive it unless it detects it. Well, guess what, it didn't always work, as I found at one conference where I went through three projectors and had to give up and "talk to my slides" while the audience watched a blank screen for 45 minutes. I doubt more than 75% of them fell asleep, but I'm an optimist -- oh, no, wait, I'm not. There was a linux utility to fix this on the 570, and I wonder if the same problem exists on the 600. The linux utility just jammed some random magic hardware bit and all was well (disabled the hardware mis-feature). So it can look like a resolution problem but actually be something else. Best bet is try 640x480 first, and if that doesn't fix it, then the problem is something else. ron ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [9fans] 00E & projector 2003-02-01 17:58 ` Ronald G. Minnich @ 2003-02-25 14:01 ` Sam 2003-02-25 16:47 ` Jack Johnson 2003-02-25 19:52 ` northern snowfall 0 siblings, 2 replies; 7+ messages in thread From: Sam @ 2003-02-25 14:01 UTC (permalink / raw) To: 9fans The TP600E, like many laptops, has 3 modes for display: lcd, lcd+external, and external. I can hook up the laptop to the projector and get a wall display - which is much farther than I thought I'd get off the bat - but when I toggle back to lcd display, the screen goes an eggshell white and I lose the display until reboot. I see little diagonal dots corresponding to the mouse which move about on mouse motion. Toggling back to external just exports this lovely display to the wall. Tips? Cheers, Sam On Sat, 1 Feb 2003, Ronald G. Minnich wrote: > On Sat, 1 Feb 2003, Russ Cox wrote: > > > Are you running your screen at a higher resolution > > than the projector supports? That's what it sounds > > like. It's also possible we screwed up the CRT > > code -- it doesn't get exercised much -- but usually > > if you Fn-F7 to get it working before aux/vga, > > it keeps working. > > Another common problem when you go to graphics mode on older thinkpads -- > there is a "feature" that doesn't work with all projectors in which the > thinkpad hardware tries to autodetect external vga, and won't drive it > unless it detects it. Well, guess what, it didn't always work, as I found > at one conference where I went through three projectors and had to give up > and "talk to my slides" while the audience watched a blank screen for 45 > minutes. I doubt more than 75% of them fell asleep, but I'm an optimist -- > oh, no, wait, I'm not. > > There was a linux utility to fix this on the 570, and I wonder if the same > problem exists on the 600. The linux utility just jammed some random magic > hardware bit and all was well (disabled the hardware mis-feature). > So it can look like a resolution problem but actually be something else. > Best bet is try 640x480 first, and if that doesn't fix it, then the > problem is something else. > > ron > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [9fans] 00E & projector 2003-02-25 14:01 ` Sam @ 2003-02-25 16:47 ` Jack Johnson 2003-02-25 19:52 ` northern snowfall 1 sibling, 0 replies; 7+ messages in thread From: Jack Johnson @ 2003-02-25 16:47 UTC (permalink / raw) To: 9fans Sam wrote: > Tips? Sorry for the long-winded response, but I'm prone to it, and don't know much about your scenario, so here it goes. I deal with pseudorandom laptops and projectors a lot, and *usually* the OS is not the main issue. As Russ said: >>>code -- it doesn't get exercised much -- but usually >>>if you Fn-F7 to get it working before aux/vga, >>>it keeps working. Timing is the key issue. Usually the Fn-whatever combo is a 3-way toggle: LCD, external, or both. With many newer laptops, it will reset the resolution of the external device when you toggle to external-only, so it's not uncommon to find your hardware trying to change resolution to 640x480 at an inconvenient time. With Windows, this usually isn't a big deal, but other OSes don't seem to appreciate the effort, and your sympoms are not uncommon. The trick is to get the hardware into "both" mode before the vga kicks in. It's often easy to wait at a boot prompt while you cruise through the toggle settings, and then let the machine continue to boot. Once the screens are in sync, the OS usually doesn't know or care that there are two monitors dangling off the same machine (Win2k/XP being exceptions with some recent hardware). Ron notes: >>Another common problem when you go to graphics mode on older thinkpads -- >>there is a "feature" that doesn't work with all projectors in which the >>thinkpad hardware tries to autodetect external vga, and won't drive it >>unless it detects it. This kind of goes hand in hand with the timing idea. Some people will fire up their laptop, then either connect the external display device while the laptop is running or while it's asleep, and the external device never gets detected. The 3-way toggle won't seem to work, etc. Besides it being just a bad idea in general to wire up a monitor to a live machine, you will often run into the above problem, and laptops that are prone to buggy autodetection will exhibit this behavior even worse. So, for review, here's the emergency drill: 1) Turn everything off. 2) Plug everything in. 3) Turn on the projector. Pop up a menu or logo screen and focus. Make sure the thing works. 4) Turn on the laptop and get it to pause, either at a boot prompt or (with some models) a BIOS screen, etc. 5) Hit the 3-way toggle until you get a display on both devices. 6) Let the machine continue to boot normally. With projectors that can handle the native resolution of the laptop, I've never had a problem using the above technique. With some older projectors, you may run into refresh rate problems, but usually the device will either show you a flickering or maladjusted image, or eternally display a notice that it's still attempting to sync to the new signal, so that kind of problem will be immediately obvious (as it should have been if you previously saw the bootmessages being projected). If in trouble and in doubt, always try to pick 60 or 75Hz with newer projectors, 67Hz with really old crap. In Plan 9, you'd want to double-check your monitor setting in plan9.ini and potentially do some tweaking. If you're using monitor=lcd, it uses the xga settings and runs at 70Hz, which should be OK for most projectors, but again will vary with age. You could try mulitsync65, otherwise, and then start bumping down the resolution until you get an image (but again, only with an older projector). If your projector has a lower maximum resolution than your laptop display, change the resolution of your laptop's display to match the projector first, then power down and follow the sequence. I have run into a very few, old laptops that won't run at less than their native resolution. Many years ago I remember toiling with a laptop that would not do less than 800x600 on the LCD (other than textmode) trying to drive a projector that wouldn't do more than 640x480. You'd probably have to work hard to get that scenario now. As an extreme last resort, you could always set your BIOS to acknowledge your external video device first, configure it just like you were using a desktop machine, and look over your shoulder during the presentation. Good luck! -Jack ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [9fans] 00E & projector 2003-02-25 14:01 ` Sam 2003-02-25 16:47 ` Jack Johnson @ 2003-02-25 19:52 ` northern snowfall 1 sibling, 0 replies; 7+ messages in thread From: northern snowfall @ 2003-02-25 19:52 UTC (permalink / raw) To: 9fans > > >I toggle back to lcd display, the screen >goes an eggshell white and I lose the display >until reboot. I see little diagonal dots >corresponding to the mouse which move about >on mouse motion. Toggling back to external >just exports this lovely display to the wall. > Ugh... be careful Soon after this started happening on my 600E the LCD blew completely. I have yet to find a replacement. Then again, I'm not looking too hard (but the part number wasn't "available" on IBM's refurbished site (or partner sites)). Don ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2003-02-25 19:52 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2003-02-01 13:29 [9fans] 00E & projector sah 2003-02-01 15:37 ` Russ Cox 2003-02-01 16:48 ` Sam 2003-02-01 17:58 ` Ronald G. Minnich 2003-02-25 14:01 ` Sam 2003-02-25 16:47 ` Jack Johnson 2003-02-25 19:52 ` northern snowfall
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