Hello! This bug seems pretty dangerous. I am experiencing it, no colors, but small horizontal white lines everywhere. All the other symptoms match. I believe this could be a heat issue also, at least, I hope (kind of). In a few days, I will most likely open up the laptop, check out the hardware and maybe replace the thermal paste. I should post back if that solves it.
The card is an M7 radeon 7500. As far as I know, there is no dedicated cooling for the video chip. Actually, there is no active cooling unless the CPU is under heavy load. -- Display corrupted with red pixels, eventually freeze, IBM A31 https://launchpad.net/bugs/44611 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
