https://bugs.freedesktop.org/show_bug.cgi?id=52373
Bug #: 52373
Summary: KMS makes screen black on ARUBA--TURKS hybrid device
Classification: Unclassified
Product: DRI
Version: unspecified
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/Radeon
AssignedTo: dri-devel at lists.freedesktop.org
ReportedBy: reinkarn at gmail.com
Created attachment 64509
--> https://bugs.freedesktop.org/attachment.cgi?id=64509
lspci
Just bought new Acer V3 notebook with hybrid AMD graphics, installed gentoo
without even Xs.
When booting with radeon.modeset=1, after loading radeon module screen goes
black (backlight is on, but nothing on the screen) (notebook works howewer, can
ssh into it), and dmesg shows two bad lines:
[drm:radeon_dp_link_train_ce] *ERROR* channel eq failed: 5 tries
[drm:radeon_dp_link_train_ce] *ERROR* channel eq failed
These lines repeat when hitting a key after backlight goes off for powersaving
When booting with no modesetting parameter, everything works fine.
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