Lockdown browser causing constant screen dimming

Question

My son had to install Lockdown Browser on his new laptop, operating with Windows 11. When Lockdown browser kicks in, the screen dims, then cycles from dim to black to bright and then continues to cycle through the brightness modes. We are unsure if it is a windows thing or a lockdown browser thing, but trying to trouble shoot from all sides since he has a test tomorrow! (yikes!)

Answer 1

Hi KC. I'm Greg, 10 years awarded Windows MVP, here to help you.

If the school is requiring this unknown browser then they should have an IT desk where they can help with issues it causes like this.

Here are some troubleshooting steps I found for it:

https://www.jeffersonstate.edu/wp-content/uploa...

https://ehelpdesk.laredo.edu/kb/article/58-resp...

https://www.ndsu.edu/fileadmin/www.its.ndsu.edu...

The Display driver is so important here that merely updating it is sometimes not enough. So let's try everything possible to get it working correctly:

First make sure you have updated the Display driver from the PC or Display adapter maker's Support Downloads web page for your exact model number, HP Serial Number or Dell Service Tag - from the sticker on the PC.

While there check also for newer chipset, BIOS/UEFI firmware (very important), network, sound, USB3 and other drivers, comparing to the ones presently installed in Device Manager reached by right clicking the Start Menu.

If necessary first remove the old driver using DDU https://translate.google.com/translate?sl=auto&... (not necessary with Microsoft Basic driver which is a placeholder if nothing else is available) and/or install in Safe Mode with Networking (so you have internet), or Safe Mode, accessed by one of these methods: https://translate.google.com/translate?sl=auto&...

If new driver still won't install DDU see Lightning Leon's Answer here: https://translate.google.com/translate?sl=auto&...

If this doesn't give you the latest or ideal driver for what you need, compare it to the driver offered by the Intel driver update Utility here: https://translate.google.com/translate?sl=auto&...

or the Nvidia Geforce updater here: https://www.nvidia.com/nl-nl/geforce/geforce-ex...

or the AMD autodect utility here: https://translate.google.com/translate?sl=auto&...

For Display issues one fix that is working is to Roll back or Uninstall the Driver on the Display Device > Driver tab, restart PC to reinstall driver.

You can also try older drivers in Device Manager > Display device > Driver tab > Update Driver > Browse > Let Me Pick.

Then you will know you've tried everything in addition to Windows Update drivers.

Adjust the screen resolution until it fits and looks best at Settings > System > Display.

Then if objects are too small, adjust their Scaling in Settings > System > Display. Start at 125% and if that's not right do a Custom scaling.

Check for WIndows Updates to see if a new monitor driver is delivered based on changes made to Display driver.

Report back results for each step so I know what else to suggest.

Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.

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