Update eink waveform

[knc1]

Originally Posted by readingforfun

WOW!! haven't had a chance to get back to my old Kindle.. (bought a new one). And this worked perfectly!! I tried the first alphabetically wbf file (didn't look at date codes..)

Had this problem for years! Didn't know it was such a simple fix =). For some reason there was a loose screw in my kindle too =/ Couldn't figure out where it goes... so left it out.

As long as you put a screw in the battery to hold it down, then your good to go.

[readingforfun]

Originally Posted by knc1

As long as you put a screw in the battery to hold it down, then your good to go.

Almost made me open it up again. The screws were black... and I didn't touch the battery at all during the whole process so I'm guessing its fine lol. Don't feel like opening it up again...

[mowgli]

Noob PC user here. Is anyone willing to fix my kindle using the jailbreak method described, via teamviewer, for example? I'll give you remote access and a small donation if you help me out. I'm unable to do it myself and using the old ribbon to restart the kindle and fix grayscale issue no longer works.
Thanks

[samm]

Originally Posted by dpavlin

Few days ago, I bought Kindle 3 which had problem with grayscales on screen. It produced follwoing messages in dmesg:

eink_fb: W log_battery_temperature:def:temp=84F:from battery
eink_fb: W bs_cmd_ld_img_upd_data_which:def:temp=35C:from pmic, outside of ideal range of 15C to 32C
eink_fb: W bs_cmd_ld_img_upd_data_which:def:temp=29C:from battery

Examining kernel /proc and /sys files we can see that display is using internal waveform and that it doesn't have panel id.

[root@kindle root]# cat /proc/eink_fb/waveform_version
V110_B059_60_WJ0105_D (M06, S/N 804, 85Hz)

[root@kindle root]# cat /sys/devices/platform/eink_fb.0/panel_id
????_???_??_???

In this case, it's eeprom on eink flat-flex cable which died. Same thing also happends when you buy replacement screens and receive one without eeprom on it.

Reading through Amazon's kernel source, I found that eink module tries to load isis.wbf waveform file if it exists. Since I didn't know which one to use, I randomly picked latest one:

[root@kindle root]# cd /var/local/eink/
[root@kindle eink]# cp V220_004_60_M12 isis.wbf

Restart your kindle and you will get your grayscale back. I hope this will help people who encounter same problem.

There is no verification if panel corresponds to waveform, and as far as I can see, any waveform (starting with V220) will work better than built-in one (which also overheats eink panel which is not good).

Wanted to say a big thank you from 2026. My wife asked me to fix her Kindle (battery replacement), and afterward, I found that the grayscale is not working. Not sure what exactly happens - maybe I somehow damaged the EEPROM on the cable when I was opening it, maybe it's just the degradation of the EEPROM on the old device. But I got this fixed by copying v110_000_60_m01 to isis.wbf.

Device works as new Thank you again, less e-waste.