11-02-2019, 03:18 PM
Moving my information to its own thread here from the General Discussions forum as it seems like at least one other person is having the issue too. I'm thinking it is hardware related as it happens on bootup before it hits any graphical intensive tasks or a desktop. I can only adjust the brightness when in desktop mode though, as it seems to be handled through the power management application.
An update on the screen flicker:
Played around with the brightness a little to see the effect and here and these are my observations on brightness levels while on battery power only...
0: no coil whine, no flicker, but absolutely too dark to see anything worthwhile
1: bad coil whine, no visible flicker, usable, just a bit dim to liking
2: horrible continuous flicker/strobe - completely unusable
3: flicker but better than 2
4: a little better than 3
5: as bad as 2
6: better than 5
7: same as 6, just brighter
8: random flicker (1-2 per second), not continuous (fractions of a second) like levels 2-7
9: horrible flicker/strobe
10: worse than 9
11: worse than 10
12-22: same as 11, just brighter, completely unusable
The flicker/strobe is also visible in non-GUI applications, like when Ctrl+Alt+F1'd
For tracking purposes, battery level is being reported as 52%. I haven't had a full discharge yet.
I'm in the process of trying to drain the battery before a full recharge to see if that fixes it, just taking a while on brightness 1.
Could it perhaps be a defective battery? Any way to test this?
Quote:I'm experiencing the exact same issue as Meatball regarding the flickering screen when on battery. When on AC power, it's fine, but as soon as I unplug it, any graphical related activity (even moving the mouse) causes random massive headache-inducing flickering. It seems to get worse as time goes on... It is still present with all dimming options off and happens at any brightness level as far as I can tell. I'm also hearing a high frequency whine when it switches to battery power though I haven't paid attention if it happens at different brightness levels. It's happening on both the default Debian install and on ayufan's rock64pro bionic-mate-pinebookpro-0.9.14-1159-armhf. I'll report back on other observations I make regarding this issue.
An update on the screen flicker:
Played around with the brightness a little to see the effect and here and these are my observations on brightness levels while on battery power only...
0: no coil whine, no flicker, but absolutely too dark to see anything worthwhile
1: bad coil whine, no visible flicker, usable, just a bit dim to liking
2: horrible continuous flicker/strobe - completely unusable
3: flicker but better than 2
4: a little better than 3
5: as bad as 2
6: better than 5
7: same as 6, just brighter
8: random flicker (1-2 per second), not continuous (fractions of a second) like levels 2-7
9: horrible flicker/strobe
10: worse than 9
11: worse than 10
12-22: same as 11, just brighter, completely unusable
The flicker/strobe is also visible in non-GUI applications, like when Ctrl+Alt+F1'd
For tracking purposes, battery level is being reported as 52%. I haven't had a full discharge yet.
I'm in the process of trying to drain the battery before a full recharge to see if that fixes it, just taking a while on brightness 1.
Could it perhaps be a defective battery? Any way to test this?