I know this question has been asked so many times (since 2011 from what I found out), but none of the responses seem to resolve the issue in my laptop, so apologies for the repetition.
I tried appending "nomodeset" to the grub boot and it no only doesn't work, but also it disables hardware acceleration, rendering X11 unusable.
I also tried some other configurations ("vga=773", like the different "video:"), but nothing seems to work.
$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)
I installed packages grub2-splashimages and grub2-themes-ubuntu-mate, assuming it could be that just there was nothing configured, but nothing makes any difference.
Booting on text by adding "set gfxpayload=text" works, and it shows the textual booting process. But I didn't get anything useful from that ... (but that it takes a minute to start the cryptswap thing, the longest part of the boot process apparently)
I didn't see anything in dmesg that stand out, but then I wouldn't know what to look for.
Also I get random blanking of the screen during normal work: the computer is still working (even sound works), but some times the screen suddenly goes black while I'm typing. I recover from that by pressing the power button (going to suspend mode) and then coming back. I've seen reports of this also elsewhere, but it is a different graphics card.
Any ideas ? Many many thanks in advance for any help!
ps: let me know if any other information I can post here would help
Some references I looked and tried already:
My computer boots to a black screen, what options do I have to fix it?
https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen
After trying the answer to the apparently duplicated question:
After logging in, there's a black screen and my cursor, nothing else! in Ubuntu 12.10
It seemed to have worked for a week, but I think it was only a coincidence, it's now randomly happening again. I've tried repeating the same commands and it doesn't have an effect.
It even happened once in the session manager, while i was typing my password to log in.
Any ideas ? Thanks in advance!
Reposted since original question was marked as answered/duplicated and I didn't find a way to reopen it.