daniel.martello wrote:Why are there 2 kernel versions of LMDE2?
What is the difference?
The kernel from before the upgrade isn't deinstalled. (And that's a prety good idea, if you ask me.)
daniel.martello wrote:Could you solve the issue?
Not solve, but I found a dirty trick for now.
I am now certain the culprit is not the Xorg part of the driver, but the kerrnel module. The monitor looses the signal on the 3.16 kernel boot long before the X server starts. When the signal gets lost with the 3.11 kernel, xrandr is not aware of any mode change.
Nonetheless, it can do something about it. As I said, if I have an active console at the time the signal gets corrupted, I can type on blindly. If at that time the screen mode is 1920x1080, and I type
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xrandr --output HDMI1 --mode 1920x1080
nothing happens. But if I type
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xrandr --output HDMI1 --mode 1280x1024
the monitor comes back to life, albeit at the lower resolution. But that is easily corrected by changing it back.
So, in the first case the X server does nothing because it thinks that the signal mode has never changed. But if another change is made, the driver gets back into a mode the monitor can handle.
And that is my dirty trick. I run a startup script after the X server has started that decreases the screen resulution and changes it back immediately. After that, I have a working monitor even with the 3.16 kernel.
So what is wrong with the kernel module? It can not be the module itself, as the two kernels run seperate versions. It must be some extra configuration file somewhere else, but I have no idea where to search for that.