Windows – Laptop LCD backlight off after resuming from hibernate or sleep

amd-catalystbacklighthp-pavilionwindows 7

When I put my laptop to hibernate or sleep while plugged in and I resume from hibernate or sleep on battery, the backlight is off. A faint image exists on the display, but is nearly impossible to read, suggesting a video driver problem. When I change GPUs using AMD PowerXpress switchable graphics, the backlight comes back on. Why would this occur, and how do I fix it?

The system is a custom-built HP Pavilion dv6z-3000 Select Edition laptop with Windows 7 Home Premium. There are two GPUs on this system, an ATI Mobility Radeon HD 4250 for low power and an ATI Mobility Radeon HD 5650 for high performance. The system is running an OEM version of the Catalyst drivers that appears to be version 10.3, based on the internal version number supplied by HP. Would I lose any OEM features in upgrading the Catalyst drivers (which may be necessary to fix the problem)?

Edit: I've updated Catalyst, and the problem seems to be gone. I can't say for sure at this time, so I'm not posting this as an answer. I'll update the question as needed. If anyone can reproduce this, let me know.

Edit 2: Unfortunately, the problem still recurred on me at least once. What exactly is the problem?

Edit 3: This problem only occurs when the system is set to use the high-performance HD 5650 GPU. PowerPlay is disabled. Any ideas? The problem is still unresolved.

For now, an answer will remain accepted, but if anyone can give a better answer, I will gladly accept the better answer.

Best Answer

The article Brightness control after resume sleep/hibernate broken seems to show that this is a universal problem with Win7 across many laptop models.

Some suggestions from the article are :

  1. In Power Settings the "Choose what the lid does" is set to do nothing, then close the lid and re-open every time this happens
  2. Press Fn+F7 (select projector mode) then select "computer only"
  3. Ensure that you are logged-in as administrator
  4. Uninstalling the monitor device (NOT display adapter) in Device Manager and then scanning for devices again.
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