Public bug reported:
[Impact]
Some I2C touchpanels generate IRQ storm after system suspend/resume.
[Test]
After applying the fix, the IRQ storm stops generated by Raydium touchpanels.
[Fix]
Instead of requesting i2c reset, simply requesting the device to power on. The
HID over I2C spec doesn't specify how the device should do upon resume from
suspend, so some devices expect a power on instead of reset.
[Regression Potential]
Low. I tested other vendors' touchpanels, didn't observe any side effect.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/1792309
Title:
Fix I2C touchpanels' interrupt storms after system suspend
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
Some I2C touchpanels generate IRQ storm after system suspend/resume.
[Test]
After applying the fix, the IRQ storm stops generated by Raydium touchpanels.
[Fix]
Instead of requesting i2c reset, simply requesting the device to power on.
The HID over I2C spec doesn't specify how the device should do upon resume from
suspend, so some devices expect a power on instead of reset.
[Regression Potential]
Low. I tested other vendors' touchpanels, didn't observe any side effect.
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