Public bug reported: >From mainline commit 256faed: Revert "drm/radeon: call hpd_irq_event on resume" (Ubuntu kernels T, U, V, W, and X carry the patch to be reverted).
----- commit 256faedcfd646161477d47a1a78c32a562d2e845 Author: Linus Torvalds <[email protected]> Date: Mon Mar 7 13:15:09 2016 -0800 Revert "drm/radeon: call hpd_irq_event on resume" This reverts commit dbb17a21c131eca94eb31136eee9a7fe5aff00d9. It turns out that commit can cause problems for systems with multiple GPUs, and causes X to hang on at least a HP Pavilion dv7 with hybrid graphics. This got noticed originally in 4.4.4, where this patch had already gotten back-ported, but 4.5-rc7 was verified to have the same problem. Alexander Deucher says: "It looks like you have a muxed system so I suspect what's happening is that one of the display is being reported as connected for both the IGP and the dGPU and then the desktop environment gets confused or there some sort problem in the detect functions since the mux is not switched to the dGPU. I don't see an easy fix unless Dave has any ideas. I'd say just revert for now" Reported-by: Jörg-Volker Peetz <[email protected]> Acked-by: Alexander Deucher <[email protected]> Cc: Dave Airlie <[email protected]> Cc: [email protected] # wherever dbb17a21c131 got back-ported Signed-off-by: Linus Torvalds <[email protected]> ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1554608 Title: Radeon hybrid graphics problem on resume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1554608/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
