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Sl K
Nickel

Latitude E6440 external display blinks when connect via hdmi

The problem: Latitude E6440 external display blinks when connect via hdmi (see attached video file)

Dell Latitude E6440:

Bios A13,
Intel(R) HD Graphics 4600,
AMD Radeon HD 8690M.

In charging state (while charge level less than 100% ) - no problem, after 100% - again problem


Some test cases:

Primarily AC Use: problem
Custom mode: 50% start ...90% stop charge (~70% charged level) - problem
Express mode: problem

Some correlation from time after ON:

~ 1....15 min - often (up 3..5 mins between re-connection HDMI)
~ 15.....30 min - rare (up to 10 mins between re-connections)

18 Replies
Moderator
Moderator

RE: Latitude E6440 external display blinks when connect via hdmi

Hi SI K,

If you haven't already done so can you update the Intel 4600 and AMD8690M first.

If the issue is still there then:

1. Restart the system and tap F2 to enter to the Bios

2. Navigate to 'Virtualization' and choose Disable (uncheck the box)  

3. Also disable VT for Direct Io and Trusted Execution 

4. Return to the main menu in the Bios and select Power Management Option and disable Advanced Battery charge configuration

Once you have done that check to see if the issue is resolved.

If it isn't then open the Intel Graphics Control Panel, go into Advanced Resolution and change the frequency for the LCD from 40Hz to 60Hz

Colin H
Dell | Social Outreach Services

I'm based in the UK and available Monday to Friday 9am-5pm GMT

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Sl K
Nickel

RE: Latitude E6440 external display blinks when connect via hdmi

Ok. I will try to do this today and inform about results.

A few questions:

  1. How can i check updated state for "Intel 4600"  and "AMD8690M" ? Where can i find valid results ?
  2. Where can i find this "update(s)" ?

I use VmWare and Hyper-V tools for software development and disable Virtualization/VT for Direct is not good solution for me. It is acceptable solution on a few months. 

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Moderator
Moderator

RE: Latitude E6440 external display blinks when connect via hdmi

The latest drivers for AMD and Intel from Dell are located on the support site. The links are below for both drivers:

AMD 8690

Intel 4600

Colin H
Dell | Social Outreach Services

I'm based in the UK and available Monday to Friday 9am-5pm GMT

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Sl K
Nickel

RE: Latitude E6440 external display blinks when connect via hdmi

Hi.
In general case - the same problem. Solution is not found.

it is possible to run some cpu/gpu/power monitoring/debug software. Any new idea ?

Some results with different drivers:

Disable Virtualization and VT of Direct

disable Advanced Battery charge

Problem

Intel latest HD4600_win64_154010.4300

AMD driver uninstalled

Problem

DELL latest Intel HD 4600 Win10_x64_Video_Driver_0WCWN_WN32_10.18.15.4281_A02

AMD Driver uninstaled

Problem

Dell Latest Intel HD 4600

AMD Latest Crimson 15.12

Problem
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Moderator
Moderator

RE: Latitude E6440 external display blinks when connect via hdmi

Let me look a bit more into this, but in the meantime:

Did you try changing the LCD frequency from 40 to 60 and what happened?

If you use any other video output cable is it ok?

Are you using any dongles to output the video? If you are, remove them and try a straight through video output (if possible)

Colin H
Dell | Social Outreach Services

I'm based in the UK and available Monday to Friday 9am-5pm GMT

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Sl K
Nickel

RE: Latitude E6440 external display blinks when connect via hdmi

Changing LCD frequency for external monitor and TV from 25 to 60 - problem.

The HDMI output can work correctly only without AC (internal battery) or internal battery is discharged and in "charging mode".

I found this problem after unboxing new notebook (less than 24Hr) and supposed  problems with HDMI cabes or my monitor. I tested with a few HDMI cables and monitors.

video dongles ? no. Simple [E6440] <--> [HDMI Output] <-->[HDMI CABLE]<--> [HDMI Input] <--->[TV or  Monitor]

VGA output works without problem. It is workaround for me now.

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Poilurt
Copper

RE: Latitude E6440 external display blinks when connect via hdmi

Thx a lot for the answer !

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Moderator
Moderator

RE: Latitude E6440 external display blinks when connect via hdmi

I've been looking into this as i said and can you:

Open the AMD catalyst panel and change the Power Options
- Change the Power plan for applications from 'Power Saving' to 'Maximum performance'
- Change the Global Power Mode from 'Adaptive' to 'High Performance'
Let me know how that goes and if it fixes the flicker or not

Colin H
Dell | Social Outreach Services

I'm based in the UK and available Monday to Friday 9am-5pm GMT

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Sl K
Nickel

RE: Latitude E6440 external display blinks when connect via hdmi

I tried a few "Power Options" High performance ... max energy save.
Nothing Smiley Happy The same problem - blinks
Power parameters as you proposed (check it) - problem HDMI "blinks"

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