I just got (2 weeks ago) a new PC -- 64bit, Windows 7. I use Spyder-3pro to calibrate.
With my monitor (LG 24" Flatron) things seem fine, then for no apparent reason the brightness seems to drop a bit. I don't remember seeing this before (on my WinXP box). I see this a few times a day (4 or 5 perhaps). The change is not huge but enough to mess up looking at photos.
I took home my office monitor (a slightly larger Philips that has terrible issues with vertical angle). It seems to happen on that one too, but not as often (anecdotal evidence for how often in both cases).
I might consider the video h/w (built-in intel) -- except that the change seems about what I see due to the Spyder3 calibration -- so I am wondering if that can kick in and out for any reason?
Any comments would be appreciated before I go to my supplier (who is our office supplier and supplier to our clients too so will support whatever I ask).
Good call -- it was set that way, but changing did not seem to help -- I don't THINK.
What I have found is that when Windows-7 goes into its snit of asking if you really want to make that system change, which darkens everything except that little popup window, and then you come back to normal - it seems to come back "dim" -- you wait a bit and in about 3 or 4 seconds it brightens, then after a time (maybe up to a minute) it dims down again.
I should check this on my office PC which is also Win7 -- I never cared at the office so might not notice.
Sat 03-Mar-12 09:41 PM | edited Sat 03-Mar-12 09:42 PM by quenton8
Found out what was causing this - I got a new monitor, an ASUS IPS monitor.
It happened to have a high native brightness. When I applied the monitor profile that brought the brightness down.
Then every so often it went VERY bright -- the high native brightness.
Seems that on Windows-7 and Windows-Vista, there may be an Intel app called - Common User Interface which allows each user to set his/her own video settings. So when you go to Administrator Mode (UAC dialog), it puts the monitor calibration back to the default -- in my case, no calibration. Then sometime later some other application (e.g. LR3/LR4/...) puts it back to the proper profile. Result is, the brightness appears to flip around.
The solution is to disable the Intel "Common User Interface" via "msconfig" -- problem gone!
Appears there was an earlier attempt to "fix" this by Xrite -- using a free utility named "displayProfile.exe", which certainly could be used to fix it every time it occurred -- most information about this has been lost -- I found it buried in on blog -- but the "Common User Interface" fix seems to be the right one.