Comment 25 for bug 1768139

Christopher Penalver:

> Without providing which kernels you tested nobody may understand why this happened.
I hadn't finished my testing. But i did test some of the mainline kernels below. I'm not certain that I installed them correctly. I was hoping to get the ubuntu kernels to build to see if I could get a negative result to confirm I'm testing properly.
linux-image-4.15.0-041500-generic (no hdmi problem)
linux-image-4.15.3-041503-generic (no hdmi problem)
linux-image-4.15.18-041518-generic (no hdmi problem)

> Yes, the instructions previously provided.
I went to https://wiki.ubuntu.com/Kernel/KernelBisection
I then went to https://launchpad.net/ubuntu/bionic/+source/linux in an attempt to install previously built kernels, and installed the packages matching the pattern
linux-headers-4.13.0-17-generic_4.13.0-17.20_amd64.deb (685.9 KiB)
linux-headers-4.13.0-17_4.13.0-17.20_all.deb (10.4 MiB)
linux-image-4.13.0-17-generic_4.13.0-17.20_amd64.deb (19.9 MiB)
once I booted this kernel the system didn't modeswitch on bootup. It didn't crash, but I dont' think it was a proper test.

Finally I attempted to build from source directly (perhaps I didn't have modules for the kernel version?)

I checked out from git: git clone git://kernel.ubuntu.com/ubuntu/ubuntu-bionic.git

Now I attempted to follow the linked wiki page from KernelBisection
https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel

* sudo apt-get build-dep linux-image-$(uname -r) # this didn't work until I enabled the source repos
* I have tried adding something like "+test1" to the chanelog in debian.master
* I also had to install libusb-dev and libpci-dev perhaps this had something to do with me installing bionic using new minimal install option.

I then did
fakeroot debian/rules clean
fakeroot debian/rules binary-headers binary-generic binary-perarch
(which takes 45 minutes)

but I only get the ../*_all.deb file.

Also, should there be modules files?

Sorry for the long post. I figured I had missed some instructions, thats why i asked first.