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PO
 

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    <p>I had this problem with my Galaxy Tab and tried the ideas mentioned above but it just didn't work for me. I have, however, figured out what's really going wrong.</p> <p>I always had this failure showing up in dmesg:</p> <p>tegra-i2c tegra-i2c.1: no acknowledge from address 0x4c</p> <p>So, it can't read from the touchscreen controller at address 0x4c because the chip isn't responding. One fix mentioned was to re-write the configuration, with the assumption that the device was somehow wedged. That doesn't work either, since you can't write to 0x4c - same lack of acknowledgement. So, if 0x4c is the right address, the chip must be dead, right?</p> <p>I tried adding a reset. No change. Disconnected the battery overnight. Also no change.</p> <p>Then, I realized what's going on. The MXT1386 has a "Firmware Update" mode. When you put it into update mode, the device address changes from 0x4c to 0x26! Once it gets into that mode, it doesn't respond to the original address. Since I don't have the docs for the device, and thus don't know how to get out of firmware update mode, I updated the Linux kernel to call the driver function that updates the firmware. Once that process is complete and the chip reset, it reverts to its original address. At that point (after a final reboot), all is well.</p> <p>I have a replacement kernel that you can install and boot which re-enables the touchpad. I'd suggest making a nandroid backup first, installing my kernel, then restoring the nandroid once it's fixed.</p>
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