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Hi Shablin, I will look In to it and provide the fix. Regards, Vathsala From: Intel-gfx [mailto:intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx]
On Behalf Of Yaroslav Shabalin Hi! I'm not sure if this is suitable way to report bugs but seems that this change (https://github.com/torvalds/linux/commit/acf45d11050abd751dcec986ab121cb2367dcbba)
breaks PSR support on my laptop. I have Dell XPS 15 9550 with Skylake i7-6700HQ CPU, 4K screen resolution (3840x2160) and Arch Linux installed. Adding i915.enable_psr=1 boot parameter on kernels <= 4.10 I get the following: -> cat /sys/kernel/debug/dri/0/i915_edp_psr_status Sink_Support: yes Source_OK: yes Enabled: yes Active: yes Busy frontbuffer bits: 0x000 Re-enable work scheduled: no Main link in standby mode: no HW Enabled & Active bit: yes However on kernel 4.11 (which I believe has this commit merged) PSR is not enabled with native screen resolution. -> cat /sys/kernel/debug/dri/0/i915_edp_psr_status Sink_Support: yes Source_OK: no Enabled: no Active: no Busy frontbuffer bits: 0x000 Re-enable work scheduled: no Main link in standby mode: no HW Enabled & Active bit: no If I change resolution to lower value (i.e. 3200x1800) PSR gets enabled as on <= 4.10 kernel. That is very sad because without PSR CPU never goes deeper than PC7 adding ~1W to idle power consumption. I would really appreciate if someone investigate this issue. Is this resolution restriction really needed and should block PSR fully?
Seems that on older kernels it wasn't a problem. Please let me know if you need any additional diagnostic information. |
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