[Galaxy Tab 8.9 General] fred_be9300:
List of common issues (and solutions) for ICS stock ROMs

I see the same questions again and again... so a FAQ is in order :)

This is mostly targeting the P7300 & P7310 ICS ROMs that are just getting out now. These devices are very similar to the P7500 and P7510 (10.1 tabs), and all these tabs (8.9, 10.1) tend to share the same common issues.

without further ado...

1. "screen" flickering / garbled / messed up when resuming from standby.

solution: see http://xdaforums.com/showthread.php?t=1867124 (summary: flash P7310UELA3 ROM via Odin, then flash your ICS ROM)

2. System freezes mysteriously, needs a forced reboot. (also: when an app force closes, the system freezes)

solution: see http://xdaforums.com/showthread.php?t=1843837

3. I flashed stock ICS via Odin, and now in recovery I can't flash any update.zip ("can't find /sdcard").

solution: flash another recovery via Odin. The stock ICS one can't find /sdcard. (unlike the stock HC recovery which did)

http://xdaforums.com/showthread.php?p=31196953#post31196953

4. How do I root after flashing ICS

Solution: If you flashed a stock ROM via Odin, then first see point 3 above to get another recovery installed, then flash any root .zip you can find (there's one in the link for point 3)

5. How do I kill the boot sound

remove or rename file /system/etc/PowerOn.ogg (you'll need root access, or you could do this via adb or via an fabricated update.zip thru recovery) - this is same as under Honeycomb

6. I don't have "universal search" (a.k.a. When I search with the google quick search box, I don't find contacts or applications).

Solution: Samsung has removed that feature in ROM for the USA region, but kept it in other ROMs. You can fix this easily, if you have a USA ROM.

http://xdaforums.com/showthread.php?p=31043430#post31043430

7. I'm not seeing my WIFI router anymore

Solution: The ICS rom seems to contain a setting that prevents it from seeing wifi routers using channel 12-13 (2.4 GHz) or using 5 GHz. You have to edit /system/etc/wifi/nvram_net.txt (change "ccode=GB" to "ccode=ALL"). Credit: original + repost + repost + repost + repost for 8.9

8. Youtube HD video or netflix lags (is choppy), same for some local HD video.

No solution so far. (it helps to lower the quality, in youtube or netflix, but that's not what I'd call a solution).

9. Can I activate voice calling?

There are solutions floating around, for the ICS stock ROMs, and for a few others. See for instance tracid's Stock ICS P7300 ROM which has some add-on's linked in OP. For further reading, visit the voice calling MOD thread

10. Losing too much battery when idle / Deep sleep issues caused by USB Storage safe removal.

There's a possibility that your tab does not deep sleep (and loses extra battery power while idle) after attaching and removing a usb storage device. Workaround = Avoid using the "Safe Removal" option in the notifications. Read more

11. Losing too much battery when idle / Unknown reasons / l2_hsic wakelock / etc

There seem to be other "wakelocks" keeping the CPU from going into Deep Sleep (basically, powering off). The wakelock keeps the CPU at a higher speed, e.g. 216MHz, drawing more power, at least 2% per hour. There is more talk about this on the 10.1 forum than the 8.9 forum, but given the similarity of the devices and stock ICS ROMs, it probably the same issue. If you want to keep an eye on this, install BetterBatteryStats. The most cited wakelock is called "l2_hsic", and according to some occurs only on the 3g tabs if it is set to Flight Mode. (understanding of this issue is still limited and evolving) - link1 link2

... I'll update this post if I see other topics repeated over and over ...

Update 1 (2012-10-14) - added 9, 10, 11

Update 2 (2012-12-25) - clarification 7