devfreq ffa30000.gpu: Couldn't update frequency transition information.

[AD7ZJ]

I am getting tons of errors like this in /var/log/syslog, and occasional odd video artifacts. The errors seem to mostly show up when I'm typing on the keyboard, and it temporarily halts the keystrokes from being input. You can be typing full speed and a few characters will show up, and then it'll hang for a few seconds, a bunch of these errors get dumped, and then the keystrokes show up.

It's an Asus C201, 2GB of RAM, wifi dongle soldered into the webcam as described on the readme on github. The latest release of PrawnOS (1.3.1) is installed to internal eMMC.

Sample of the errors: Nov 30 23:09:39 PrawnOS kernel: [ 1253.471016] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:39 PrawnOS kernel: [ 1253.546898] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:39 PrawnOS kernel: [ 1253.611053] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:39 PrawnOS kernel: [ 1253.675249] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:39 PrawnOS kernel: [ 1253.863115] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:40 PrawnOS kernel: [ 1253.927181] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:40 PrawnOS kernel: [ 1253.991118] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:09:40 PrawnOS kernel: [ 1254.063159] devfreq ffa30000.gpu: Couldn't update frequency transition information.

[AD7ZJ]

Sample of a video artifact

[AD7ZJ]

Nov 30 23:28:32 PrawnOS kernel: [ 2386.337222] Purging 3952640 bytes Nov 30 23:28:32 PrawnOS kernel: [ 2386.356120] panfrost ffa30000.gpu: gpu sched timeout, js=0, config=0x3300, status=0x8, head=0x5ba8b80, tail=0x5ba8b80, sched_job=90fc5512 Nov 30 23:28:32 PrawnOS kernel: [ 2386.363657] Purging 4198400 bytes Nov 30 23:28:32 PrawnOS kernel: [ 2386.400304] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:32 PrawnOS kernel: [ 2386.464361] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:32 PrawnOS kernel: [ 2386.532171] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:32 PrawnOS kernel: [ 2386.604172] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:32 PrawnOS kernel: [ 2386.668178] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:32 PrawnOS kernel: [ 2386.732159] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:32 PrawnOS kernel: [ 2386.812246] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:33 PrawnOS kernel: [ 2386.932190] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:33 PrawnOS kernel: [ 2386.949093] Purging 524288 bytes Nov 30 23:28:33 PrawnOS kernel: [ 2386.960696] Purging 4001792 bytes Nov 30 23:28:33 PrawnOS kernel: [ 2386.970089] Purging 176128 bytes Nov 30 23:28:33 PrawnOS kernel: [ 2387.008169] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:33 PrawnOS kernel: [ 2387.076155] devfreq ffa30000.gpu: Couldn't update frequency transition information. Nov 30 23:28:33 PrawnOS kernel: [ 2387.092105] panfrost ffa30000.gpu: gpu sched timeout, js=0, config=0x3300, status=0x8, head=0x2bc1680, tail=0x2bc1680, sched_job=e3cfaf0d

[AD7ZJ]

So, after upgrading all the packages, which did install a new kernel, this problem seems to have gone away. I do still see the "Purging XXXXXX Bytes" messages occasionally but maybe that is normal. I am now at this kernel version, I did not think to look at what was there in the initial install.

Linux PrawnOS 5.10.1-gnu-PrawnOS #1 SMP PREEMPT Tue Dec 15 19:20:04 PST 2020 armv7l GNU/Linux