[BLISS ROMS Development] franzli:
My experience with the latest build, as far as I was able to test (only on the live USB so far, haven't decided which one to update to)

Dell Venue 8 Pro 5855 (Cherry Trail)

minor issue I noticed on both stable and bleeding edge: When hitting poweroff, I get the choice screen that should only come up when I choose reboot, i.e. there's no way of properly shutting down, only to do reboot

newest bleeding edge (4.12rc5 kernel):

improvements: hardware buttons now working, so it is possible to switch off the screen and switch on again

new (?) problem: Youtube videos don't play, i.e. first few frames move, afterwards it either just hangs or shows a black frame - but the time bar below indicates that playing continues (cannot test if sound is still delivered, since audio output does not work)

working:

wifi

buttons

stylus

backlight control (? this one is weird, I'm pretty sure it worked on my first attempt, but the last time I booted from the USB stick, backlight control did not work anymore)

Not working:

Audio (neither internal, nor via cable nor with bluetooth, which isn't working in general)

Autorotation

Bluetooth

Camera

haven't been able to test microphone due to lack of audio, but suspect it's not working either

Geekbench score is much worse than on the bleeding edge I have currently installed (with kernel 4.11, build from May 4, see my feedback on page 40 of this thread)

single core: 1092

multicore: 2025 (which is slightly better than on stable, but about 1000 points less than I used to have; I cannot securely exclude that this has to do with running from USB, although I believe I used to get slightly over 3000 even when running on USB on previous builds, except the one just before this one)

newest stable (4.9 kernel):

working:

Wifi

Buttons

Stylus

Audio is sort of working with bluetooth, but see below

Bluetooth (although using it for Audio it drops after a few seconds, stopping a youtube video, than reconnects etc.)

Not working:

backlight control (not sure if this is a regression, I thought backlight may have been working previous stable? not entirely sure though)

Audio (neither internal, nor via cable; bluetooth see above)

Autorotation

haven't tested Camera and microphone

Interestingly, the stable build seems a bit better insofar as bluetooth is at least sort of working, but the lack of backlight control is unfortunate and it would be good to have a reliable connection via bluetooth. One other weird issue: I ran geekbench and it definitely ran up to somewhere between 30 and 40%. I then left the device alone for a few minutes and when I returned the screen was black and didn't turn back on. So either Geekbench had crashed the device, or it had finished geekbench and was then gone to sleep without me being able to wake it again.

After booting another time, it seems that the stable build is generally a bit sluggish on this tablet. PlayStore also closed on me a number of times (no error message).

Got Geekbench to run eventually, the score shows that multicore management seems to go wrong (or there's a process running wild):

single core: 1055 (this is roughly as I'd expect for the device)

multicore: 1770 (this is about half of what the device should be able to get)

For the DV8P 5855 the bleeding edge build seems to be slightly better. It is nice to be able to use the buttons, but not sure if losing backlight control is worth it for me - also considering problems with the youtube app (not that I need this much as long as sound is not working, but another app, squid, also closed on its own when I was trying the stylus)

If it would be helpful for debugging, I might consider installing the latest bleeding edge to get some logcats. Please let me know what you'd need in that case and I'll see if I can get to do that in the next week or so.