Comment 0 for bug 1386534

kernel 3.13.0-37 and 3.16.0-23, but not kernel 3.13.0-36

The phenomenon: just when the user interface starts at the end of the Ununtu startup, the screen reamins in one solid color (very light grey, this is the everage of my colors), except for the topmost 3-4 scan lines, where one can see some sort of vibrating content. Sometimes there is a 1-3 seconds of normal operation just at the start, when Ctrl-Alt-F2 works, and swithing there one can work in the character terminal forever. But as soon as the disorder in the X view appears, even the Ctrl-Alt-F2 console change does not work visually, however a blindly stroken Ctr-Alt-Del is correctly executed.

What I know: (1) on the core i3 based laptop there is no trace of this kind of view crash, while in case of the Phenom x6 1100t and Radeon HD 6570 based desktop machine the problem is fully deterministic. (2) the problem is distro independet, i.e.: I have it with Ubuntu 14.04 + kernel 3.13.0-37-generic, and also with Ubuntu 14.10 + 3.16.0-23-generic, and I do NOT have it with Ubuntu 14.04 + kernel 3.13.0-36-generic, and also with Ubuntu 14.10 + 3.13.0-36-generic. (3) In case of Ubuntu 14.04 in average every second or third boot gave a 1-3 seconds of grace period when I could escape to Ctrl-Alt-F2, while in case of Ubuntu 14.10 there is no such a short time slot when I could escape. (4) my configuration is set to fall into my only user account directly, I will do experiments, whether the problem is there, if the startup is without falling into an account.

If I can, I will apport log files with produced with the 3.16.0-23-generic kernel as well, not only with the 3.13.0-36-generic.

I try to send the remaining information after my work day, now I have to leave, sorry.