Okay, first of all, sorry for the long comment but here are my observations from scanning the kern.log:
If this block: [ 18.460593] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 18.460617] i915 0000:00:02.0: setting latency timer to 64 comes before this block: [ 18.559570] [drm] radeon defaulting to kernel modesetting. [ 18.559574] [drm] radeon kernel modesetting enabled. [ 18.559599] VGA switcheroo: detected switching method \_SB_.PCI0.GFX0.ATPX handle [ 18.559652] radeon 0000:01:00.0: enabling device (0000 -> 0003) [ 18.559660] radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 18.559666] radeon 0000:01:00.0: setting latency timer to 64 We will get: (...) [ 18.560350] i915 0000:00:02.0: irq 42 for MSI/MSI-X (...) [ 18.630999] [drm:intel_dsm_platform_mux_info], MUX info connectors: 7 (...)(mux load) [drm:intel-stuff]x30 [ 18.827202] vga_switcheroo: enabled [ 18.827287] radeon atpx: version is 1 [ 18.842578] HDA Intel 0000:00:1b.0: BAR 0: set to [mem 0xdc500000-0xdc503fff 64bit] (PCI address [0xdc500000-0xdc503fff]) [ 18.842592] HDA Intel 0000:00:1b.0: enabling device (0000 -> 0002) [ 18.842620] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 [ 18.842757] HDA Intel 0000:00:1b.0: irq 43 for MSI/MSI-X [ 18.842793] HDA Intel 0000:00:1b.0: setting latency timer to 64 (...) [ 28.717369] ATOM BIOS: Acer [ 28.717382] radeon 0000:01:00.0: GPU softreset (...) (GPU reset stack) [ 28.864335] radeon 0000:01:00.0: irq 45 for MSI/MSI-X [ 28.864343] radeon 0000:01:00.0: radeon: using MSI. [ 28.864356] radeon 0000:01:00.0: IH ring buffer overflow (0xFFFFFFFF, 0, 15) [ 28.864386] [drm] radeon: irq initialized. [ 28.864388] [drm] GART: num cpu pages 131072, num gpu pages 131072 [ 28.864892] [drm] Loading REDWOOD Microcode [ 29.042576] radeon 0000:01:00.0: Wait for MC idle timedout ! [ 29.187699] radeon 0000:01:00.0: Wait for MC idle timedout ! [ 29.189702] radeon 0000:01:00.0: WB enabled [ 29.206269] BUG: unable to handle kernel paging request at ffffc9041b591ffc -> CRASH if however the blocks on top are switched round we get: (...) [ 25.383004] ATOM BIOS: Acer (...) (no GPU reset ) [ 25.383379] radeon 0000:01:00.0: irq 43 for MSI/MSI-X [ 25.383386] radeon 0000:01:00.0: radeon: using MSI. [ 25.383423] [drm] radeon: irq initialized. [ 25.383426] [drm] GART: num cpu pages 131072, num gpu pages 131072 [ 25.383942] [drm] Loading REDWOOD Microcode [ 25.417531] radeon 0000:01:00.0: WB enabled [ 25.434108] [drm] ring test succeeded in 1 usecs (...) [ 26.836096] i915 0000:00:02.0: irq 44 for MSI/MSI-X (...) [ 26.905062] [drm:intel_dsm_platform_mux_info], MUX info connectors: 7 (....) (mux load) [ 26.905137] vga_switcheroo: enabled [drm:intel-stuff] x30 [ 27.090241] HDA Intel 0000:00:1b.0: BAR 0: set to [mem 0xdc500000-0xdc503fff 64bit] (PCI address [0xdc500000-0xdc503fff]) [ 27.090256] HDA Intel 0000:00:1b.0: enabling device (0000 -> 0002) [ 27.090290] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 [ 27.090462] HDA Intel 0000:00:1b.0: irq 45 for MSI/MSI-X [ 27.090495] HDA Intel 0000:00:1b.0: setting latency timer to 64 ->GOOD BOOT The IRQ's assigned are consistent with good boot/bad boot (radeon IRQ 45/Intel IRQ 43 -> Bad boot, radeon IRQ 43/Intel IRQ 45 -> Good boot). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/727620 Title: [Radeon HD 5650 and 5470] Kernel BUG during recovery boot and in normal boot (Hybrid graphics) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
