Ubuntu 14.04.3 - Screen has black flashes

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dor_13

Distinguished
Oct 26, 2011
202
3
18,685
Often the screen has black flashes.
I'm not sure what triggers the black flashes.
In Windows 7 (dual boot) it doesn't seem to happen.

I'm using Ubuntu 14.04.3 and:
Code: 
$ uname -a
Linux dor-H87M-D3H 3.13.0-61-generic #100-Ubuntu SMP Wed Jul 29 11:21:34 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Also here's the output of dmesg.

I changed the screen (bought a new one actually) but the problem persists.

If any additional data is needed then please do ask for it.


 
Solution
ESPclipse
One possible solution is removing AMD's installed drivers (fglrx) and using the kernel's driver set. Maybe you can try to reinstall AMD's drivers afterward if you really need performance from the GPU. AMD also released an update to there linux proprietary driver set that seems to support HD5000 series GPUs, if you want to check that out as well.

To reinstall AMD's proprietary driver for your device from Ubuntu's repo, run:

sudo apt-get isntall ==reinstall fglrx


To remove fglrx completely, run:

sudo apt-get remove –purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*


If you run this, then I really hope that (I'm assuming) Unity does not crash. If the desktop manager does crash, you may need to reinstall ubuntu-desktop and Unity...
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dor_13

Distinguished
Oct 26, 2011
202
3
18,685

The graphic card is quite old:

From the graphic card manual said:
GIGABYTE HD 5750
ATI RADEON SERIES
GV-R575D5-1GD
Click to expand...

I've tried to notice whether I/something triggers the flashes but couldn't recognize anything in particular:
Sometimes it happens while watching a website via the browser (Firefox),
sometimes during watching a movie,
etc.
 
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ESPclipse

ESPclipse

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May 27, 2014
364
0
4,960
One possible solution is removing AMD's installed drivers (fglrx) and using the kernel's driver set. Maybe you can try to reinstall AMD's drivers afterward if you really need performance from the GPU. AMD also released an update to there linux proprietary driver set that seems to support HD5000 series GPUs, if you want to check that out as well.

To reinstall AMD's proprietary driver for your device from Ubuntu's repo, run:

sudo apt-get isntall ==reinstall fglrx


To remove fglrx completely, run:

sudo apt-get remove –purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*


If you run this, then I really hope that (I'm assuming) Unity does not crash. If the desktop manager does crash, you may need to reinstall ubuntu-desktop and Unity with:

sudo apt-get install --reinstall ubuntu-desktop
sudo apt-get install --reinstall unity

If even that will not fix Unity, you may have luck reverting to a former setup with:

mv ~/.config/dconf/user ~/.config/dconf/user.old


Should the fglrx removal go smooth, then you will be running from the kernel driver, and that may be better for you, but no guarantees. May be worth trying, though. Again, if you want to try installing AMD's proprietary driver, just install fglrx from the Ubuntu repo or get the installer package from AMD's website. I would also see what an Ubuntu-dedicated forum has to say about your issue, as Tom's Hardware seems to lack any notable Linux community. Hopefully you can find some resolution ;)
 
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