[Dell Latitude 7320] Clipping and pointer lag after update to kernel 5.13 due to PSR
I believe that PSR was working on my machine in the Ubuntu 5.11 kernel. After update to 5.13, I experience graphics issues that disappear when I set i915.enable_psr=0
in the GRUB configuration. 5.15 seems to disable PSR despite setting i915.enable_psr=1
.
Correct me if I'm wrong, but I think this is a regression because, when in the 5.11 kernel, I see:
=> sudo cat /sys/kernel/debug/dri/0/i915_edp_psr_status
Sink support: yes [0x03]
PSR mode: PSR2 enabled
Source PSR ctl: enabled [0xc2044a99]
Source PSR status: SLEEP [0x30000111]
Busy frontbuffer bits: 0x00000000
Frame: PSR2 SU blocks:
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
PSR2 selective fetch: disabled
The value for PSR status varies between SLEEP, DEEP_SLEEP, CAPTURE, and IDLE.
In the 5.15 kernel with i915.enable_psr=1
I see:
=> sudo cat /sys/kernel/debug/dri/0/i915_edp_psr_status
Sink support: yes [0x03]
PSR mode: disabled
PSR sink not reliable: no
In the syslog I have a line:
Oct 19 22:10:49 esperanza kernel: [ 2.541544] Setting dangerous option enable_psr - tainting kernel