search for: page_system_on

...erent purposes, so if we are unlucky, it causes mysterious memory corruptions. For me, booting with nv_printk debug levels set to 5 was enough to trigger it. It manifested as long stream of: "trapped write at ... on channel 0x0001fea0 BAR/PFIFO_WRITE/IN reason: DMAOBJ_LIMIT / PT_NOT_PRESENT / PAGE_SYSTEM_ONLY / PAGE_NOT_PRESENT" which eventually lead to complete hang. Disabling access to VGA memory (through 0x54 PCI config space register) is enough to fix it, but it breaks copying screen data between old and new console (because old data is inaccessible). But blanking console (with entering_gfx=...

...ing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. [ 17.349142] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx [ 17.349654] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready [ 21.940164] [drm] nouveau 0000:03:00.0: PFIFO: read fault at 0x00080da000 [PAGE_SYSTEM_ONLY] from PGRAPH/GPC3/(unknown enum 0x0000000b) on channel 0x0000a21000 [ 21.940171] [drm] nouveau 0000:03:00.0: PFIFO: unknown status 0x40000000 DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+10ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-12.21-generic 3.2.2 Uname: Linux 3.2.0-12-generic x86_64 Ap...

....470774] nouveau 0000:01:00.0: gr: 00200000 [] ch 2 [001fa31000 Xorg[2678]] subc 0 class 5039 mthd 0328 data 00000000 [ 4008.481808] nouveau 0000:01:00.0: fb: trapped read at 0000f72000 on channel 2 [1fa31000 Xorg[2678]] engine 00 [PGRAPH] client 03 [DISPATCH] subclient 04 [M2M_IN] reason 00000003 [PAGE_SYSTEM_ONLY] [12964.990240] nouveau 0000:01:00.0: fifo: DMA_PUSHER - ch 2 [Xorg[2678]] get 0000031500 put 0000034394 ib_get 00000172 ib_put 00000173 state 8000e6a0 (err: INVALID_CMD) push 00704031 [12965.017230] nouveau 0000:01:00.0: fifo: DMA_PUSHER - ch 2 [Xorg[2678]] get 000003732c put 0000034394 ib_get...