Created attachment 64509 [details] 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.
Created attachment 64510 [details] dmesg output. Last four lines are when i hit any key to turn backlight back on
Created attachment 64511 [details] grub.cfg if needed
Created attachment 64514 [details] kernel 3.5.0 config, 3.4.3 is similar
X is not starting as well showing: (II) [KMS] Kernel modesetting enabled. radeon: Invalid PCI ID. Tried with latest stable and latest git libdrm and xf86-video-ati
*** This bug has been marked as a duplicate of bug 52256 ***
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