I have turned acpi=off ,that's the only way I found to boot my computer but battery indicators are not showing.Is there any possible way I can have battery indicators ,and also better battery backup because battery is dripping very fast.I am having HP 13-b202tu
Don't know. What happens if you boot your computer plugged into AC? What happens if you use your battery in another similar computer?
How old is your battery? What power and capacity does it show if you actually get your computer to boot? Is it time to replace your battery? You know you can probably buy new cells and solder them inside the old case?
Is this only ubuntu problem? Can you test with some other OS like Windows, or a LiveCD of a newer ubuntu version?
If the battery drain happens with all OSes, then Campbell's advice of returning and replacing it is a good idea.
I have Ubuntu 14.04 on my dell, and running with zero issues. If you want some info from my OS for comparison, let me know.
The question is, is it serious enough for you? It's already causing boot problems, it'll probably prevent typical actions like suspend and hibernating from working, and since entire subsystem is off,
normal power management like turning off idle usb devices and hard disks won't be carried out, likely draining the battery quickly. Given my usage patterns, if that happened with my laptop, I'd consider it a serious problem.
I don't know enough about PC hardware to say what side effects turning off ACPI PCI scanning may have.
Try it out for a few days. Since it's ok with windows, compare time for a full battery discharge in windows vs ubuntu and see if there's a big difference.
I'll also urge you try out the latest ubuntu (15.10) via a live cd. Often, such hardware incompatibilities in older versions are solved in newer versions. Trying it via a livecd is very safe; your current installation and partitions won't get affected at all.
If the latest version boots without acpi issues, then you can always upgrade your partition to it.
Regarding your supplier, I'm surprised you have to convince them, but a bug is a bug and it's not your mistake. Perhaps you can quietly remove that noacpi flag, show them it's not booting, and get a replacement ;)