On Samsung NP270E5V-K01PL laptop there was a horizontal line across the screen that was occasionally visible, since few hours the line is almost permanent and changes only the colour (either light or dark). I'm attaching photo of the distortion, will attach Xorg log and dmesg. This looks like bug 64332 (which is resolved), but I'm using newer software versions and the bug is still there.
Created attachment 86310 [details] Screen distortion -- horizontal line (JPEG photo)
Created attachment 86311 [details] dmesg
Created attachment 86312 [details] Xorg log
Can you please boot with drm.debug=0xe added to your kernel cmdline and attach the complete dmesg?
Created attachment 86313 [details] dmesg with drm.debug=0xe added
What exactly do you mean by "occasionally visible"? Does it appear only after a specific event? Do you know any reliable way to make it appear/disappear? If you press ctrl+alt+f1, does it go away?
It was appearing randomly -- it was visible for few seconds, then went away for few more and so on. Since yesterday it's permanently there. On tty1 Fedora has X running, switching to tty2 does not make the line go away (and it looks like due to intelfb it does not switch resolution). Using xrandr to switch resolutions: xrand --output LVDS1 --mode 640x480 and xrandr --output LVDS1 --auto does not make the line go away. After last testing with xrandr the line changed colour from white to black, after few seconds it went to white again.
One more observation: if the screen content is mostly light colour the line becomes light too, if I display an image with all black the line slowly (~5 seconds) goes to dark, almost black colour.
I am pretty sure this a failing LVDS panel. I notice my old eeepc 700 has developed the same symptom - and it shows irrespective of what is driving the panel (i.e. it is apparent during BIOS posting as well).
I've checked and the line is also visible in BIOS settings.
If the bios also shows it then I think we can safely presume that this is a hw issue.
Actually we might have a patch for you to test: https://patchwork.kernel.org/patch/2972111/
Created attachment 86936 [details] disable lvds clock gating for high res displays Care to try this patch?
(In reply to comment #13) > Created attachment 86936 [details] > disable lvds clock gating for high res displays > > Care to try this patch? Sure! I'm building custom kernel, will report back with results. Thanks!
I've rebooted the machine with custom kernel with attached patch, the distortion is still present. Does it require something more?
Nope, was worth a shot, but this really looks like a broken panel.
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