https://bugs.freedesktop.org/show_bug.cgi?id=75511
--- Comment #7 from Ilia Mirkin <[email protected]> --- Well, analyzing the vbios from the second (working) card, what I see is: Init script 0 at 0x83e0: 0x83e0: 8c UNK8C 0x83e1: 7a 00 02 00 00 20 20 00 00 ZM_REG R[0x000200] = 0x00002020 0x83ea: 33 14 REPEAT 0x14 0x83ec: 6e 00 00 00 00 ff ff ff ff 00 00 00 00 NV_REG R[0x000000] &= 0xffffffff |= 0x00000000 0x83f9: 36 END_REPEAT 0x83fa: 7a 00 02 00 00 25 21 01 40 ZM_REG R[0x000200] = 0x40012125 0x8403: 7a c0 24 12 00 00 00 00 00 ZM_REG R[0x1224c0] = 0x00000000 0x840c: 7a 40 26 12 00 00 00 00 00 ZM_REG R[0x122640] = 0x00000000 0x8415: 6e 00 24 02 00 ff f7 ff ff 00 08 00 00 NV_REG R[0x022400] &= 0xfffff7ff |= 0x00000800 and so on Looking at the pci rom of the first (non-working) card, I see: Init script 0 at 0x83e0: 0x83e0: 42 ??? 0x83e1: 66 CONFIGURE_MEM 0x83e2: ad ??? 0x83e3: 66 CONFIGURE_MEM 0x83e4: c1 ??? 0x83e5: c8 ??? As you can see the bytes are all different, I'm pretty sure this is 16-bit real mode x86 code: $ udcli -16 -x 42 66 ad 66 c1 c8 10 ee 66 c1 c0 08 ee 66 c1 c0 08 ee e2 ed 1f 66 61 0000000000000000 42 inc dx 0000000000000001 66ad lodsd 0000000000000003 66c1c810 ror eax, 0x10 0000000000000007 ee out dx, al 0000000000000008 66c1c008 rol eax, 0x8 000000000000000c ee out dx, al 000000000000000d 66c1c008 rol eax, 0x8 0000000000000011 ee out dx, al 0000000000000012 e2ed loop 0x1 0000000000000014 1f pop ds 0000000000000015 6661 popad Otherwise the bioses appear identical... at least the DCB and GPIO tables match up. So I'd recommend simply grabbing that good vbios-1.rom, sticking it in /lib/firmware (in the initrd if that's where nouveau is loaded from), and adding nouveau.config=NvBios=vbios-1.rom which will use that as the vbios instead of trying to read it from the card. I'm not extremely happy with this solution, of course, but it's the fastest way to get something that works. Can you provide any relevant details about your system? These appear to both be mobile chips, it's pretty uncommon to have that in a single system. Would you also mind providing an acpidump? Perhaps the vbios for the first card is hiding in ACPI somewhere unexpected. -- You are receiving this mail because: You are the assignee for the bug.
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