Member Avatar for aliensXY

I connect my laptop with a LCD display Samsung T240.
My laptop HP 8510p has ATI mobility 2600HD graphic card. Connection between both is established with HDMI. OS is WinVista 32, SP2.

The problem is my monitor often blinks (picture becomes black for a second, also sound is interupted). Before a blink some tiny lines are shown on the screen. Blinking is more often when running a 3D game, when draging a window over the screen more intensively, when click on 3D options in ATI Control Center (where some 3D graphic is shown)...

So, what have I done so far?
- I used two different HDMI cables, same result with both.
- I tried VGA cable, everything worked fine except one blue screen (display driver) occured.
- Primarily I have HP mobility driver installed. I deleted it and installed newer driver from ATI (amd) website with a modder support (because this graphic card officialy supports only HP edited driver). Same result. Then I uninstalled it and wait windows to recognize a graphic card and specify a driver for it. Still same result (blinking).
- On my friend's laptop everyhing is working just fine. He has a Nvidia card (8xxx something).

So, most likely problem is ATI driver. The question is, is there a solution or do I have to get rid of my Samsung T240?

Thanks for any replies.

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Dani AI

Generated

Given the observations from and , the behavior described most often points to three possibilities: a driver/power-management interaction, an HDMI/EDID handshake problem, or a hardware fault (GPU port or monitor electronics). The fact that the flicker is heavier under GPU load and changes with power state is an important clue toward power-management or driver issues rather than a simple loose cable.

Practical isolation steps to follow in order:

  • Test the external display with a different HDMI source (Blu‑ray player, console) and test the laptop with a different external display. If the fault follows the laptop, suspect the GPU/driver; if it follows the monitor, suspect the monitor/port.
  • Boot a Linux live USB (Ubuntu, etc.) and try a short GPU load or just normal desktop use. If flicker disappears under Linux, it strongly indicates a Windows driver/configuration problem.
  • While reproducing a blink in Windows, check Event Viewer for display-driver errors and note timestamps; use a monitoring tool (GPU-Z/HWMonitor) to watch clocks and temps during a blink.
  • Try a short, high‑quality HDMI cable and an HDMI→DVI adapter if available. Also switch Windows Power Options to High Performance and set the Radeon control panel to maximum performance (disable PowerPlay/low‑power features) while testing.

Driver and configuration tips:

  • Do a clean driver uninstall (use Display Driver Uninstaller if comfortable), then install the OEM HP mobility driver first; only then test newer vendor drivers. Update the laptop BIOS and chipset drivers from HP before experimenting with modded drivers — modded packages can mask OEM fixes and cause instability.
  • If HDMI handshake/EDID looks suspect, consider using an EDID emulator or forcing a custom EDID (advanced users only). Read about EDID here: EDID.
  • Official support/resources: and Samsung support.

If the problem persists across OSes and different sources, collect logs and timestamps and contact hardware support (HP or Samsung) for diagnostics/RMA. Back up data before firmware or BIOS changes, and avoid using unstable modded drivers long term.

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Member Avatar for Rik_

Have you checked what refresh it's running at? And what refresh rates are supported by your monitor?

Member Avatar for aliensXY

Supported refresh rates are 59Hz and 60Hz. I tried both of them.

Also I noticed that when my laptop is on battery blinking does not occur so often.

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