Created attachment 69522 [details] dmesg output On my muxed hybrid system (Lenovo IdeaPad U455) X works fine with IGD gpu (RS780M), but screen gets garbled when DIS gpu (RV710) is active. In dmesg output there are lots of following messages: [drm:r600_packet3_check] *ERROR* bad START_3D [drm:radeon_cs_ib_chunk] *ERROR* Invalid command stream ! My system is: Lenovo IdeaPad U455 with RS780M and RV710 gpus. linux-3.7.0-rc3+ libdrm-2.4.39 xf86-video-ati-6.14.6 mesa-9.0 glu-9.0 xorg-server-1.12.3
Created attachment 69523 [details] lspci -vvv
Created attachment 69524 [details] /var/log/Xorg.0.log
The r6xx command stream is getting sent to the r7xx kernel driver instance.
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