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Tasklist

FS#70477 - [i915 blank screen] Comet Lake GPU doesn't work with TGL/RKL PCH

Attached to Project: Arch Linux
Opened by Rugantio Costa (rugantio) - Friday, 16 April 2021, 17:37 GMT
Last edited by Jan Alexander Steffens (heftig) - Wednesday, 21 April 2021, 09:22 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Critical
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 1
Private No

Details

Description:
Comet Lake CPUs can be paired with different PCH: the CMP platform is based on the 400-series chipset for Comet Lake processors, while the TGP platform is based on the 500-series chipset for Tiger Lake CPUs.
However if a Comet Lake CPU is mounted on a TGP platform, i915 *fails* miserably to manage the video resulting in a blank, turned off, screen.
Intel has provided a patch for this problem here: https://patchwork.freedesktop.org/patch/412664/

Additional info:
* package version(s)
Kernel: Linux 5.11.14-arch1-1 x86_64
CPU: Intel(R) Core(TM) i9-10900K (Comet Lake)
MoBo: Asus Prime Z590-P

* config and/or log files etc.
This bug has been extensively documented on the linux Mint forum: https://forums.linuxmint.com/viewtopic.php?t=345452

This task depends upon

Closed by  Jan Alexander Steffens (heftig)
Wednesday, 21 April 2021, 09:22 GMT
Reason for closing:  Upstream
Comment by loqs (loqs) - Friday, 16 April 2021, 17:58 GMT Comment by Rugantio Costa (rugantio) - Friday, 16 April 2021, 18:50 GMT
Thank you loqs, I missed that the merge was in progress.
Comment by loqs (loqs) - Friday, 16 April 2021, 19:27 GMT
I backported the four patches from that series to 5.12-rc7. Three could be cherry-picked cleanly while one needed manual adjustment.
Please see if that fixes the issue.
Or would you like me to build the kernel for you?
Comment by Rugantio Costa (rugantio) - Saturday, 17 April 2021, 08:57 GMT
loqs, I cannot thank you enough for the backport, probably otherwise I had to wait august for the 5.13 release, but it works great so far!

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