[Bug 42373] Radeon HD 6450 (NI CAICOS) screen corruption on boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42373

--- Comment #6 from Kunal <kunal.gangakhedkar at gmail.com> 2011-11-06 20:28:26 PST ---
Noticed these new messages in dmesg output:
[   15.828387] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff000 flags=0x0010]
[   15.828394] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff080 flags=0x0010]
[   15.828397] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff040 flags=0x0010]
[   15.828399] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff0c0 flags=0x0010]
[   15.828401] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff100 flags=0x0010]
[   15.828404] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff140 flags=0x0010]
[   15.828406] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff180 flags=0x0010]
[   15.828408] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff1c0 flags=0x0010]
[   15.828410] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff200 flags=0x0010]
[   15.828412] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff240 flags=0x0010]
[   15.828414] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff280 flags=0x0010]
[   15.828416] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff2c0 flags=0x0010]
[   15.828418] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff300 flags=0x0010]
[   15.828421] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff480 flags=0x0010]
[   15.828423] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff340 flags=0x0010]
[   15.828425] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff4c0 flags=0x0010]
[   15.828427] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff380 flags=0x0010]
[   15.828429] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff500 flags=0x0010]
[   15.828431] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff3c0 flags=0x0010]
[   15.828433] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff540 flags=0x0010]
[   15.828435] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff400 flags=0x0010]
[   15.828438] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff580 flags=0x0010]
[   15.828440] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff440 flags=0x0010]
[   15.828442] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016
address=0x0000000e7ffff5c0 flags=0x0010]

Matching the "device=..." from above messages with output from lspci shows that
these are from radeon driver.

"lspci -vvnn | grep 01:00.0" output:
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc NI Caicos [AMD
RADEON HD 6450] [1002:6779] (prog-if 00 [VGA controller])

I don't know much about how IOMMU works - hence thought I'd just post it in the
bug report if it helps you in any way.

Attaching the full dmesg log after this comment.

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