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02-03-2009 10:58 AM
I've connected my new LP2475W monitor to the DVI port of an ATI All-In-Wonder x600 Pro using the DVI cable, on a Windows XP Pro SP3 system. Everything works fine until I put the system into standby mode, and then later wake it up. The system wakes up, but the monitor doesn't. If I use the VGA to DVI cable (connected to the VGA port on the ATI card), the monitor wakes up fine after a standby.
I can connect a Dell LCD with the DVI cable to the DVI port on the card, and it wakes up fine after a standby.
I've installed the HP LP2475w drivers, have updated to the latest ATI drivers and Catalyst 9.1. From other postings on loss of DVI signal, I've tried turning the monitor off and on just before waking the system, disabling the "ATI hotkey poller" service, uninstalling and reinstalling the Windows XP ACPI Fixed Features, and the tool at http://thydzik.com/tag/hdmion/.
Is there some monitor setting required to get the LP2475w to wake up on DVI when the system wakes up?
02-03-2009 02:23 PM
I have the same monitor, bought a couple of weeks ago and I have the same problem as you. I have a Radeon ATI 9600 128Mb graphics card with a DVI output. When I connect it to the monitor using DVI to DVI it works fine from boot up, but if you turn the monitor off and on again, the signal is not detected. The only way to get the monitor to recognise the signal again is to reboot the computer. Using VGA (via an adaptor) to DVI there are no issues at all. I have the most uptodate Graphics drivers, BIOS, chipset driver and monitor driver. I've tweaked with every setting tweakable, but still nothing.
I've already been in touch with HP via support pages. They suggested it maybe the graphics card after trying a few things out to do with the settings on OSD which had no effect.
I contacted AMD support. They indicated that I may be experiencing the problem because I had an onboard VGA (even though I wasn't using this) and that I should try disabling this in the BIOS. I did this and no luck. They then suggested contacting Shuttle.
Shuttle did not offer too much in the way of help, but did say that my model has an oldish chipset and that PCI graphics cards are "not very good" with them due to bandwidth. I thought this answer to be a bit floury and dismissive.
I've trawelled the forums and our problem is very common indeed, not just with this monitor. But still very few possible solutions.
I was surprised to hear that your Dell LCD worked using DVI to DVI and that the HP didn't! Maybe the Dell doesn't need as much juice.
I am all out of ideas now and think that the only way i'm going to get a digital video signal is to get a new PC.
02-04-2009 03:11 PM
I just received this monitor today and although it is beautiful I am having the exact same problem! I am using a Radeon 9800 128Mb video card connected via DVI to the LP2475W and after switching inputs or going into standby the monitor will not turn back on.
If anyone finds a solution, please post!
02-07-2009 06:38 AM
I am hoping someone out there has found a solution for this problem? HP and ATI seem to have numerous problems with monitors not waking up from sleep mode, there has to be an answer!
02-09-2009 12:37 PM
02-09-2009 01:04 PM
I am also planning a new build in the next 12 months and it would be really helpful to know which cards to avoid. There seem to be alot of things ranging from ATI cards, HCDP, EDID, and ACPI causing sleep concerns. None of which have helped my problem; I will keep reading and trying new things until I figure something out!
02-14-2009 10:20 PM
In my case, the problem was fixed after I updated graphic card driver.
OS : XP Pro SP3
G-Card: ATI Radeon
03-01-2009 02:18 PM
For some reason today when i turned my monitor off and then on again several minutes later, it detected the digital signal. I have no idea why this has started working properly all of a sudden as I have not intentially made any changes. The only thing I can think of is that I have been downloading the Windows updates which may have installed something that fixed the problem. Do any of you guys who have experienced this issue regularly download windows updates?
03-05-2009 05:40 AM
I did find a technique to get out of sleep mode
-Windows XP, Radeon X600, HP LP 2475W,
-digital connected to DVI-1
Auto Detect input=OFF
Auto Switch input=ON
Get out of sleep Procedure
-Press Quick Select (monitor light should change to green)
-manually select HDMI (+ or - buttons)
-just after the monitor light changes from green to amber-press the QUICK SELECT button
At this point the displayed menu should show DVI-1 selected and your monitor should be displaying the normal background.
I have no idea why this works but it does on my system