Total crash and color flickering

Lorunification · 11-21-2013, 02:54 PM

Hello all together,

I have a strange problem with my Linux Mint 15 running on a Thinkpad T420s.

Sometimes while doing graphic intensive stuff, like watching movies, the system crashes and i get only colored flickering on the screen (as seen in the image: http://i.imgur.com/xPUkvVu.jpg).
After about 15 seconds the system shuts down. After this i can normally start the system and everything works fine. I assume its some kind of graphics driver issue, but i don't know how to evaluate this.

The graphic chip is an Intel HD2000 which is integrated in the CPU. I think the driver module is i915.

I experience this issue with several kernel versions. Right know i am using Kernel 3.8.0-19-generic

Does anybody else have problems like this or does somebody have a hint on how to solve this issue?

Thank you in advance,
Lorunification

business_kid · 11-22-2013, 02:25 PM

It looks like you have lost horizontal lock. Your picture is doing one speed and your monitor another.

Try slowing the refresh rate - which slows everything else, or lower your max horizontal speed
Somethere in a .conf file in Xorg.d

...
HorizSynch 30-60

..

Lower the '60' 5 at a time.

Lorunification · 11-22-2013, 02:48 PM

Thank you for your reply bussines_kid.

Unfortunately there is no config file containing "HorizSynch" or anything similar. Not in /etx/X11/ nor in /usr/share/X11/Xorg.conf.d/
May i create a new one in this case? Could you perhapts give me more specific information about how the Section has to look like?

I also tried to change RefreshRate within the "monitors" menu - but there is only 60 Hz selectable.

Update:

I managed to set the refresh rate to 55Hz using the following sequence of xrandr commands. I will check if this solves my problem and then provide further information.

Quote:

#!/bin/bash

rate=$1

line=$(cvt 1600 900 $rate | tail -n1 | cut -d' ' -f2-)
xrandr --newmode $line
xrandr --verbose --addmode LVDS1 "1600x900_$rate.00"
xrandr --output LVDS1 --mode "1600x900_$rate.00"

Thank you in advance,
Lorunification

business_kid · 11-23-2013, 02:36 AM

Difficulty in setting refresh is usually a difficulty with the video driver. I'm no expert on the best driver to use with your card.

Yes, of course you can add a file there. Simply put
HorizSync 31-55
VertRefresh 50-70

or some such into a text file with a name ending in .conf. As long as it finds it there, it should be run. You may need a bigger video config, but that's quick to try.